Snails, fresh, chilled, frozen, dried, salted or in brine, except sea snails

1. Scope and Applicability

This PCR covers non-sea snail goods harvested from managed terrestrial rearing or lawful wild gathering and delivered fresh, chilled, frozen, dried, salted or in brine at a declared farm or first-processing gate. Record species, source route, intended use, whole/shelled presentation, actual sold state, applicable grade or quality criterion, moisture or brine content, and gate. The six sale states are alternatives for identified lots, not sequential mandatory steps or interchangeable kilograms; a declared batch may undergo multiple operations only if its final sold state and intermediate balances are recorded. Sea snails, other animals, goods transformed beyond these listed states, downstream retail distribution and consumer use are excluded. Food safety requirements apply when the declared use is human food, not to every snail lot. Wild-collected snails have no fictitious managed-rearing parent. UN CPC 3.0 sets the product boundary; FAO snail-farming guidance and FAO gathering guidance support example production routes.

2. Product Category Identity

Field	Value
canonical_pcr_id	pcr.agriculture-forestry-and-fishery-products.live-animals-and-animal-products-excluding-meat.snails-fresh-chilled-frozen-dried-salted-or-in-brine-except-sea-snails
classification_refs	CPC 3.0 02920
covered_products	Non-sea snails in one declared fresh, chilled, frozen, dried, salted or brined sale state, with intended use and applicable quality criterion disclosed.
excluded_products	Sea snails; other animal products; prepared or otherwise transformed goods beyond the listed states; post-gate distribution.
representative_product	Accepted terrestrial-snail goods lot weighed in its declared as-sold state at farm or first-processing handover.
production_route	Managed rearing then independent harvest, or lawful wild gathering; first handling and applicable cleaning/grade sorting; optional state-specific preservation; protective packing when used.
market_state	State-specific whole or shelled non-sea snail lot; packaging and any free brine are separately reported.

3. Reference Flow

Field	Value
What	Accepted non-sea snail goods in one declared sold state and intended use at the actual handover gate.
How much	1 kg net snail product as sold, excluding packaging and separately reported free brine.
How well	Species, lawful source, whole/shelled presentation, intended use, applicable grade/quality criterion, condition/rejection, moisture/brine, and food-safety status when used as food declared.
How long or cycle	Identified rearing cohort or gathering event through handover; multi-period breeding stock and shared services attributed over actual service periods.
reference_flow_link	pack_product

Field	Value
Reference amount	1
Reference product flow	Non-sea snail goods, sold state and handover-gate qualified
Reference flow property	Mass 93a60a56-a3c8-11da-a746-0800200b9a66
Reference unit group	Mass units 93a60a57-a4c8-11da-a746-0800200c9a66
Reference unit	kg
Required qualifiers	species; managed or lawful wild route; intended use; whole/shelled; fresh/chilled/frozen/dried/salted/brined; gross and net mass; moisture and free-brine accounting; applicable grade/quality criterion; actual gate; cohort/event; package tare

4. Measurement and Unit Rules

rule_id	Applies to	Required property	Required unit	Rule
m_net	reference and intermediate lots	Mass	kg	Weigh net snail material after tare; record separated shell, rejected material and free brine separately.
m_state	preserved versus fresh lots	Mass and moisture fraction	kg; kg/kg	Record pre- and post-preservation mass, measured moisture and separately added salt/brine. Compare states only through measured solids and recipe mass balance, never a fixed universal yield.
m_grade	accepted and rejected lots	Mass	kg	Reconcile incoming material with accepted, downgraded, rejected and measured losses on the same lot basis.
m_period	rearing, shared facilities and gathering	Time and service measure	period; service unit	Link inputs, harvest, facility services and output to the relevant cohort, gathering event and reporting period exactly once.
inventory_reference_normalization	all inventory rows	Actual flow property	exchange unit per reference flow	The inventory and collection aggregation fields below express final amounts per declared reference flow. Keep all raw collection records, original denominator qualifiers, route/period strata, unit conversions and allocation requirements. For each flow, first obtain its attributable amount in its own numerator unit using the existing rules; then divide by the measured accepted reference-output quantity of the same scope and multiply by the declared reference quantity. Do not mix species, states, gates or incompatible routes; count transfers and shared burdens once. A missing, zero or untraceable accepted-output denominator is a blocking data-quality issue. Keep provisional QA ranges on their explicitly stated bases; they are not conversion factors or production defaults. These are final foreground-package contributions, not replacements for stage quantitative references or stage-native unit-process datasets. Retain stage records separately. Compute normalized amount = attributable raw amount * declared reference quantity / measured accepted final reference-output quantity. Apply normalization exactly once.
stage_throughput_linkage	stage records and final package contributions	Actual flow property and its stated raw basis	retain native numerator and stage denominator units	Keep the original lot, event, cohort, period and stage denominators with their units. Reconstruct the attributable numerator A with measured stage quantity Q_stage and documented attribution before final normalization. If a quoted amount a_B corresponds to an explicit stage basis B_stage (for example, 1000 kg), use A = a_B * Q_stage / B_stage. If r_stage is already an intensity in exchange-unit per stage-unit, instead use A = r_stage * Q_stage, with no second division by B_stage. A raw attributable total is used directly. Final contribution = A * declared reference quantity / measured accepted final output. Convert compatible units explicitly and apply each attribution/allocation share exactly once; never treat a quoted amount or intensity as a raw total. Link stage transfers, losses, rejects, stocks, shared services and allocation to the same actual route, period and final-output stratum. For a 1000 kg basis retain 1000 kg explicitly. Do not assume unit yield, equal fresh/dried mass, equal head mass, equal dose quality or interchangeable gates. Missing links, unsupported unit conversion, zero denominators and untraceable allocation block dataset production. Stage-native datasets retain their own stage reference; package contributions are a separate projection.

5. System Boundary

Boundary Abstraction

Field	Value
declared_starting_condition	Managed route: identified breeding/juvenile stock and feed source; wild route: documented lawful collection area and event, without managed breeding inputs.
starting_condition_role	Purchased stock, feed, salt, packaging and energy cross as upstream Product inputs; land and reusable assets use documented period/service attribution.
product_classification_scope	Non-sea snail goods in declared fresh, chilled, frozen, dried, salted or brined sale states; no universal food-use requirement.
recursive_input_rule	Purchased snails of this category entering grading or preservation retain upstream burden and are not recounted as newly reared or gathered output.
upstream_dataset_requirement	Require traceable upstream datasets for purchased juvenile stock/feed, salt, utility, packaging and equipment where included; no zero-burden purchased snail input.
disclosure	Declare species, route legality, state, gate, lot and period, rejected destinations, asset ownership and all preservation choices.

Boundary Rules

rule_id	Applies to	Rule	source_ids
b_route	managed or wild source	Include managed husbandry with breeding/juvenile stock, feed and enclosure care only for managed lots. Wild gathering begins at the lawful collection context; its habitat is not modelled as a farm. Harvest/gathering remains a distinct removal and handoff from production context.	fao-improved-snail-farming;fao-snail-farming-gathering
b_condition	collected to accepted product	Include first handling, with purging/cleaning and grade sorting when the actual route or intended use requires them. Separate accepted goods, independently marketable downgraded goods and rejected/waste destinations by the declared quality criterion. Shell and waste are not silently saleable product.	fao-improved-snail-farming
b_preserve	optional preserved lots	Include chill, freeze, dry, salt or brine interventions only when actually performed before handover. Record input energy, salt/brine and water, residues, moisture loss and rejection; do not require all treatments on one lot.	fao-improved-snail-farming
b_gate	all lots	Include protective packing and on-site handling through actual farm/first-processing handover; exclude downstream distribution, retail and cooking. Record reusable package return and shared facility services separately.	fao-improved-snail-farming

6. Process Inventory Structure

Process Map

process_id	process_name	inclusion	inclusion_condition	role	quantitative_reference
rear	Managed terrestrial-snail rearing	conditional	Managed-production route only	Parent biological production of harvest-ready snails; not imputed to wild lots	kg harvest-ready snails per cohort
gather	Harvest or lawful gathering	required	Every accepted lot	Independently remove snails from enclosure or documented wild site; identify incidental material and loss	kg collected raw snails
prepare	First handling and applicable grade sorting	required	Every goods lot; purge/clean only when performed	Transfer collected material to an accepted state under declared intended-use criteria, with other destinations explicit	kg incoming raw snails
preserve	State-specific preservation	conditional	Chilled, frozen, dried, salted or brined before sale	Usable prepared snails to one documented stabilized state; residues and losses separated	kg usable prepared snails entering step
pack	Protective packing and handover	required	Every sale lot; package materials only when used	Accepted fresh or preserved state presented and handed over at declared gate	kg net non-sea snail goods

Harvest is independent of managed rearing because removal occurs after production of harvest-ready animals; wild gathering uses the same removal node without a rearing parent. First handling records incoming state, actual purge/clean inputs when used, and accepted, separately marketable downgraded and rejected destinations against declared intended-use criteria. Preservation receives usable product, and the handover node receives either fresh or one measured final preserved state. Shared enclosures, washing stations, cold rooms and packaging services used by multiple cohorts, nodes or periods require one recorded service measure and one attribution.

Process: Managed terrestrial-snail rearing (rear)

Inputs

Product flows

Purchased juvenile or breeding snails (rear_stock)

Record identity, count or weighed mass, cohort and opening/closing stock; this input exists only on the managed branch.

Denominator and scope requirements：per kg harvest-ready snails from managed cohort

Raw quantity and calculation requirements: Supplier receipts plus stock change by cohort. Original collection denominator kind: process_output.

• Selected flow: Terrestrial snail breeding or juvenile stock (UUID unresolved)
• Flow property / unit: Count or Mass / item or kg
• Amount rule: Calculate the attributable final-package exchange under inventory_reference_normalization and stage_throughput_linkage using the matched raw records.
• Value mode: Calculated value (calculated_value)
• Specificity: Site-specific (site_specific)
• Normalization basis: per reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_rearing
• Range: Completeness screen for purchased stock
  • Range role: QA guardrail (qa_guardrail)
  • Lower: 0
  • Upper: 1000
  • Unit: kg/kg
  • Basis: kg purchased stock per kg harvest-ready output; provisional and never a default breeding rate
  • Basis kind: Process output (process_output)
  • Evidence kind: Reasoned estimate (reasoned_estimate)

Rearing and cleaning water (rear_water)

Meter water entering enclosure care and hygiene, not precipitation already outside the managed process.

Denominator and scope requirements：per kg harvest-ready managed snails

Raw quantity and calculation requirements: Metered consumption assigned to cohort and period. Original collection denominator kind: process_output.

• Selected flow: Supplied process water (UUID unresolved)
• Flow property / unit: Mass / kg
• Amount rule: Calculate the attributable final-package exchange under inventory_reference_normalization and stage_throughput_linkage using the matched raw records.
• Value mode: Calculated value (calculated_value)
• Specificity: Site-specific (site_specific)
• Normalization basis: per reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_utilities
• Range: Provisional water completeness screen
  • Range role: QA guardrail (qa_guardrail)
  • Lower: 0
  • Upper: 100000
  • Unit: kg/kg
  • Basis: supplied water per kg harvest-ready output; investigate outliers
  • Basis kind: Process output (process_output)
  • Evidence kind: Reasoned estimate (reasoned_estimate)

Waste flows

Elementary flows

Outputs

Product flows

Harvest-ready managed snails (rear_ready)

Weigh the biological output available for separate physical harvest; it is an internal state, not final sold mass.

Denominator and scope requirements：per managed cohort

Raw quantity and calculation requirements: Measured ready mass by cohort. Original collection denominator kind: process_output.

• Selected flow: Harvest-ready terrestrial snails (UUID unresolved)
• Flow property / unit: Mass / kg
• Amount rule: Calculate the attributable final-package exchange under inventory_reference_normalization and stage_throughput_linkage using the matched raw records.
• Value mode: Calculated value (calculated_value)
• Specificity: Site-specific (site_specific)
• Normalization basis: per reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_rearing
• Range: Provisional quantity-completeness screen, not a default input or acceptance threshold
  • Range role: QA guardrail (qa_guardrail)
  • Lower: 0
  • Upper: 1000000
  • Unit: kg/cohort
  • Basis: per managed cohort; investigate outliers against raw records
  • Basis kind: Process output (process_output)
  • Evidence kind: Reasoned estimate (reasoned_estimate)

Waste flows

Elementary flows

Process: Harvest or lawful gathering (gather)

Inputs

Product flows

Managed harvest-ready snails (gather_managed_input)

Use only on managed route; inherit cohort burden once from rearing.

Denominator and scope requirements：per kg collected raw snails

Raw quantity and calculation requirements: Mass transferred from rear node. Original collection denominator kind: process_output.

• Selected flow: Harvest-ready terrestrial snails (UUID unresolved)
• Flow property / unit: Mass / kg
• Amount rule: Calculate the attributable final-package exchange under inventory_reference_normalization and stage_throughput_linkage using the matched raw records.
• Value mode: Calculated value (calculated_value)
• Specificity: Site-specific (site_specific)
• Normalization basis: per reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_harvest
• Range: Provisional quantity-completeness screen, not a default input or acceptance threshold
  • Range role: QA guardrail (qa_guardrail)
  • Lower: 0
  • Upper: 1000
  • Unit: kg/kg
  • Basis: per kg collected raw snails; investigate outliers against raw records
  • Basis kind: Process output (process_output)
  • Evidence kind: Reasoned estimate (reasoned_estimate)

Electricity at the equipment supply point (gather_energy_electricity)

Collection scope and applicability for gather_energy. The following concrete identities have separate cards and apply only when use or generation is evidenced inside the original process scope. They are not mandatory inputs or a default recipe. Document non-use; missing records are not zero. Add a separate concrete card for any other actual material instead of substituting one of these names or UUIDs. Preserve attribution and boundaries and avoid double counting components included in outsourced services.

Measure powered collection equipment when used; manual collection has no invented electricity demand. Denominator and scope requirements：per kg collected raw snails Raw quantity and calculation requirements: Metered or fuel-recorded consumption by event. Original collection denominator kind: process_output.

Confirm identity, grade, state and unit from equipment, supplier and contemporaneous measurements; the product UUID does not establish actual use or upstream-provider compatibility. Retain the electricity supply point, fuel grade, density and heating-value basis. Distinguish purchased heat from on-site fuel conversion without counting its input fuel again.

• Selected flow: Alternating current 455f0ef5-6118-4f2b-a3f5-1f75e0afe3ca
• Flow property / unit: Energy / kWh
• Amount rule: Collect raw quantities for this identity under cp_utilities and calculate the exchange per declared reference flow using the original attribution rules.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per declared reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_utilities
• Sources: fao-agricultural-energy

This binding is alternating current at the use point with supply technology, voltage and provider unspecified. Confirm actual AC supply; DC requires a different identity. The database reference is 1 MJ: preserve meter kWh and convert once using 1 kWh = 3.6 MJ when linking reference quantities. Internal generation links to its foreground generator, without an additional purchased-electricity burden.

Diesel fuel supplied to equipment (gather_energy_diesel)

Confirm identity, grade, state and unit from equipment, supplier and contemporaneous measurements; the product UUID does not establish actual use or upstream-provider compatibility. Retain the electricity supply point, fuel grade, density and heating-value basis. Distinguish purchased heat from on-site fuel conversion without counting its input fuel again.

• Selected flow: Diesel fuel 9d258d75-6792-4f1c-9856-81602ed8f816
• Flow property / unit: Mass / kg
• Amount rule: Collect raw quantities for this identity under cp_utilities and calculate the exchange per declared reference flow using the original attribution rules.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per declared reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_utilities
• Sources: fao-agricultural-energy

Waste flows

Elementary flows

Outputs

Product flows

Collected raw snails (gather_raw)

Transfer measured whole raw non-sea snails from farm or lawful wild site to first preparation; capture loss and incidental material separately.

Denominator and scope requirements：per collection event

Raw quantity and calculation requirements: Weigh collected lot and record collection context. Original collection denominator kind: process_output.

• Selected flow: Collected raw terrestrial snails (UUID unresolved)
• Flow property / unit: Mass / kg
• Amount rule: Calculate the attributable final-package exchange under inventory_reference_normalization and stage_throughput_linkage using the matched raw records.
• Value mode: Calculated value (calculated_value)
• Specificity: Site-specific (site_specific)
• Normalization basis: per reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_harvest
• Range: Provisional quantity-completeness screen, not a default input or acceptance threshold
  • Range role: QA guardrail (qa_guardrail)
  • Lower: 0
  • Upper: 1000000
  • Unit: kg/event
  • Basis: per collection event; investigate outliers against raw records
  • Basis kind: Process output (process_output)
  • Evidence kind: Reasoned estimate (reasoned_estimate)

Waste flows

Incidental or unfit collected material (gather_incidental)

Separate debris, unfit animals and measured field losses by actual destination.

Denominator and scope requirements：per kg collected raw snails

Raw quantity and calculation requirements: Weighed debris and unfit quantity; record uncollected estimated loss separately. Original collection denominator kind: process_output.

• Selected flow: Incidental collection residue, identified composition (UUID unresolved)
• Flow property / unit: Mass / kg
• Amount rule: Calculate the attributable final-package exchange under inventory_reference_normalization and stage_throughput_linkage using the matched raw records.
• Value mode: Calculated value (calculated_value)
• Specificity: Site-specific (site_specific)
• Normalization basis: per reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_residues
• Range: Provisional quantity-completeness screen, not a default input or acceptance threshold
  • Range role: QA guardrail (qa_guardrail)
  • Lower: 0
  • Upper: 1000
  • Unit: kg/kg
  • Basis: per kg collected raw snails; investigate outliers against raw records
  • Basis kind: Process output (process_output)
  • Evidence kind: Reasoned estimate (reasoned_estimate)

Elementary flows

Process: First handling and applicable grade sorting (prepare)

Inputs

Product flows

Raw snails entering preparation (prepare_raw)

Record the collected lot and any separately purchased snails, retaining upstream burdens for both.

Denominator and scope requirements：per kg preparation input

Raw quantity and calculation requirements: Weigh all incoming lots and keep source shares. Original collection denominator kind: process_output.

• Selected flow: Raw terrestrial snails (UUID unresolved)
• Flow property / unit: Mass / kg
• Amount rule: Calculate the attributable final-package exchange under inventory_reference_normalization and stage_throughput_linkage using the matched raw records.
• Value mode: Calculated value (calculated_value)
• Specificity: Site-specific (site_specific)
• Normalization basis: per reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_preparation
• Range: Provisional quantity-completeness screen, not a default input or acceptance threshold
  • Range role: QA guardrail (qa_guardrail)
  • Lower: 0
  • Upper: 1000
  • Unit: kg/kg
  • Basis: per kg preparation input; investigate outliers against raw records
  • Basis kind: Process output (process_output)
  • Evidence kind: Reasoned estimate (reasoned_estimate)

Purging and washing water (prepare_water)

When purging or washing is actually performed, record supplied water and its wastewater destination; an unwashed route has no invented water input.

Denominator and scope requirements：per kg raw snails prepared

Raw quantity and calculation requirements: Metered water net of documented recovery. Original collection denominator kind: process_output.

• Selected flow: Supplied process water (UUID unresolved)
• Flow property / unit: Mass / kg
• Amount rule: Calculate the attributable final-package exchange under inventory_reference_normalization and stage_throughput_linkage using the matched raw records.
• Value mode: Calculated value (calculated_value)
• Specificity: Site-specific (site_specific)
• Normalization basis: per reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_utilities
• Range: Provisional water-use screen
  • Range role: QA guardrail (qa_guardrail)
  • Lower: 0
  • Upper: 100000
  • Unit: kg/kg
  • Basis: supplied water per kg raw snails prepared
  • Basis kind: Process output (process_output)
  • Evidence kind: Reasoned estimate (reasoned_estimate)

Waste flows

Elementary flows

Outputs

Product flows

Accepted prepared snails (prepare_accepted)

First handling assigns a goods-accepted state against the declared intended use and quality criterion; conditional cleaning and sorting are recorded before fresh handover or state-specific preservation.

Denominator and scope requirements：per kg incoming raw snails

Raw quantity and calculation requirements: Weigh accepted grade and record whole or shelled state. Original collection denominator kind: process_output.

• Selected flow: Prepared non-sea snail goods, intended-use qualified (UUID unresolved)
• Flow property / unit: Mass / kg
• Amount rule: Calculate the attributable final-package exchange under inventory_reference_normalization and stage_throughput_linkage using the matched raw records.
• Value mode: Calculated value (calculated_value)
• Specificity: Site-specific (site_specific)
• Normalization basis: per reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_preparation
• Range: Provisional quantity-completeness screen, not a default input or acceptance threshold
  • Range role: QA guardrail (qa_guardrail)
  • Lower: 0
  • Upper: 1000
  • Unit: kg/kg
  • Basis: per kg incoming raw snails; investigate outliers against raw records
  • Basis kind: Process output (process_output)
  • Evidence kind: Reasoned estimate (reasoned_estimate)

Separately marketable downgraded grade (prepare_downgraded)

Record only when a genuine separately marketable downgraded grade exists for the declared use; otherwise classify unfit material as waste.

Denominator and scope requirements：per kg incoming raw snails

Raw quantity and calculation requirements: Weigh grade and document its independent destination. Original collection denominator kind: process_output.

• Selected flow: Downgraded non-sea snail goods lot, intended-use qualified (UUID unresolved)
• Flow property / unit: Mass / kg
• Amount rule: Calculate the attributable final-package exchange under inventory_reference_normalization and stage_throughput_linkage using the matched raw records.
• Value mode: Calculated value (calculated_value)
• Specificity: Site-specific (site_specific)
• Normalization basis: per reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_preparation
• Range: Provisional quantity-completeness screen, not a default input or acceptance threshold
  • Range role: QA guardrail (qa_guardrail)
  • Lower: 0
  • Upper: 1000
  • Unit: kg/kg
  • Basis: per kg incoming raw snails; investigate outliers against raw records
  • Basis kind: Process output (process_output)
  • Evidence kind: Reasoned estimate (reasoned_estimate)

Waste flows

Unfit snails, shell and wash residue (prepare_reject)

Weigh rejected animals, separated shell, soil and other residue, with destination and any saleable shell disclosed separately.

Denominator and scope requirements：per kg incoming raw snails

Raw quantity and calculation requirements: Weigh and reconcile with incoming and accepted masses. Original collection denominator kind: process_output.

• Selected flow: Preparation reject, composition- and destination-specific (UUID unresolved)
• Flow property / unit: Mass / kg
• Amount rule: Calculate the attributable final-package exchange under inventory_reference_normalization and stage_throughput_linkage using the matched raw records.
• Value mode: Calculated value (calculated_value)
• Specificity: Site-specific (site_specific)
• Normalization basis: per reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_residues
• Range: Provisional quantity-completeness screen, not a default input or acceptance threshold
  • Range role: QA guardrail (qa_guardrail)
  • Lower: 0
  • Upper: 1000
  • Unit: kg/kg
  • Basis: per kg incoming raw snails; investigate outliers against raw records
  • Basis kind: Process output (process_output)
  • Evidence kind: Reasoned estimate (reasoned_estimate)

Elementary flows

Process: State-specific preservation (preserve)

Inputs

Product flows

Prepared usable snails (preserve_input)

One accepted measured lot enters one actual chilling, freezing, drying, salting or brining route.

Denominator and scope requirements：per kg prepared input

Raw quantity and calculation requirements: Weigh incoming state before intervention. Original collection denominator kind: process_output.

• Selected flow: Prepared non-sea snail goods, intended-use qualified (UUID unresolved)
• Flow property / unit: Mass / kg
• Amount rule: Calculate the attributable final-package exchange under inventory_reference_normalization and stage_throughput_linkage using the matched raw records.
• Value mode: Calculated value (calculated_value)
• Specificity: Site-specific (site_specific)
• Normalization basis: per reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_preservation
• Range: Provisional quantity-completeness screen, not a default input or acceptance threshold
  • Range role: QA guardrail (qa_guardrail)
  • Lower: 0
  • Upper: 1000
  • Unit: kg/kg
  • Basis: per kg prepared input; investigate outliers against raw records
  • Basis kind: Process output (process_output)
  • Evidence kind: Reasoned estimate (reasoned_estimate)

Electricity at the equipment supply point (preserve_energy_electricity)

Collection scope and applicability for preserve_energy. The following concrete identities have separate cards and apply only when use or generation is evidenced inside the original process scope. They are not mandatory inputs or a default recipe. Document non-use; missing records are not zero. Add a separate concrete card for any other actual material instead of substituting one of these names or UUIDs. Preserve attribution and boundaries and avoid double counting components included in outsourced services.

Record metered refrigeration, freezing or drying energy only for performed intervention; record carrier and shared service period. Denominator and scope requirements：per kg stabilized state output Raw quantity and calculation requirements: Metered energy, apportioned once across measured service and output. Original collection denominator kind: process_output.

Confirm identity, grade, state and unit from equipment, supplier and contemporaneous measurements; the product UUID does not establish actual use or upstream-provider compatibility. Retain the electricity supply point, fuel grade, density and heating-value basis. Distinguish purchased heat from on-site fuel conversion without counting its input fuel again.

• Selected flow: Alternating current 455f0ef5-6118-4f2b-a3f5-1f75e0afe3ca
• Flow property / unit: Energy / kWh
• Amount rule: Collect raw quantities for this identity under cp_utilities and calculate the exchange per declared reference flow using the original attribution rules.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per declared reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_utilities
• Sources: fao-agricultural-energy

This binding is alternating current at the use point with supply technology, voltage and provider unspecified. Confirm actual AC supply; DC requires a different identity. The database reference is 1 MJ: preserve meter kWh and convert once using 1 kWh = 3.6 MJ when linking reference quantities. Internal generation links to its foreground generator, without an additional purchased-electricity burden.

Waste flows

Elementary flows

Outputs

Product flows

Preserved non-sea snail goods (preserve_output)

Document the one resulting chilled, frozen, dried, salted or brined usable state and transfer its measured snail mass to packing.

Denominator and scope requirements：per kg prepared input

Raw quantity and calculation requirements: Weigh after intervention, excluding separately drained free brine and package. Original collection denominator kind: process_output.

• Selected flow: State-qualified preserved non-sea snail goods (UUID unresolved)
• Flow property / unit: Mass / kg
• Amount rule: Calculate the attributable final-package exchange under inventory_reference_normalization and stage_throughput_linkage using the matched raw records.
• Value mode: Calculated value (calculated_value)
• Specificity: Site-specific (site_specific)
• Normalization basis: per reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_preservation
• Range: Provisional quantity-completeness screen, not a default input or acceptance threshold
  • Range role: QA guardrail (qa_guardrail)
  • Lower: 0
  • Upper: 1000
  • Unit: kg/kg
  • Basis: per kg prepared input; investigate outliers against raw records
  • Basis kind: Process output (process_output)
  • Evidence kind: Reasoned estimate (reasoned_estimate)

Waste flows

Preservation loss or reject (preserve_reject)

Record spoiled snails, drained brine and other residues; evaporation is a mass-balance loss, not a waste flow.

Denominator and scope requirements：per kg prepared input

Raw quantity and calculation requirements: Weigh segregated residuals and identify wastewater destination. Original collection denominator kind: process_output.

• Selected flow: Route-specific preservation residue (UUID unresolved)
• Flow property / unit: Mass / kg
• Amount rule: Calculate the attributable final-package exchange under inventory_reference_normalization and stage_throughput_linkage using the matched raw records.
• Value mode: Calculated value (calculated_value)
• Specificity: Site-specific (site_specific)
• Normalization basis: per reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_residues
• Range: Provisional quantity-completeness screen, not a default input or acceptance threshold
  • Range role: QA guardrail (qa_guardrail)
  • Lower: 0
  • Upper: 1000
  • Unit: kg/kg
  • Basis: per kg prepared input; investigate outliers against raw records
  • Basis kind: Process output (process_output)
  • Evidence kind: Reasoned estimate (reasoned_estimate)

Elementary flows

Process: Protective packing and handover (pack)

Inputs

Product flows

Accepted fresh or preserved snail lot (pack_input)

Receive one measured accepted state from preparation or preservation; keep separate lots for each state.

Denominator and scope requirements：per kg final net snail product

Raw quantity and calculation requirements: Weigh accepted lot before packaging. Original collection denominator kind: process_output.

• Selected flow: State-qualified non-sea snail goods (UUID unresolved)
• Flow property / unit: Mass / kg
• Amount rule: Calculate the attributable final-package exchange under inventory_reference_normalization and stage_throughput_linkage using the matched raw records.
• Value mode: Calculated value (calculated_value)
• Specificity: Site-specific (site_specific)
• Normalization basis: per reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_handover
• Range: Provisional quantity-completeness screen, not a default input or acceptance threshold
  • Range role: QA guardrail (qa_guardrail)
  • Lower: 0
  • Upper: 1000
  • Unit: kg/kg
  • Basis: per kg final net snail product; investigate outliers against raw records
  • Basis kind: Process output (process_output)
  • Evidence kind: Reasoned estimate (reasoned_estimate)

Waste flows

Elementary flows

Outputs

Product flows

Non-sea snail goods at actual gate (pack_product)

Weigh one state-qualified sale lot after package tare and report product identity, grade, route and exact farm or first-processing handover gate.

Raw reference-output records: Net accepted sold snail mass; free brine and package mass separately disclosed. Preserve the measured accepted lot quantity and every required qualifier. The amount below is the normalized reference exchange, not an assertion that a physical lot contains only one unit.

Denominator and scope requirements：per reference flow

• Selected flow: Non-sea snail goods, sold state and handover-gate qualified
• Flow property / unit: Mass / kg
• Amount rule: 1 kg
• Value mode: Calculated value (calculated_value)
• Specificity: Site-specific (site_specific)
• Normalization basis: per reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_handover
• Range: Reference-output normalization equality
  • Range role: QA guardrail (qa_guardrail)
  • Lower: 1
  • Upper: 1
  • Unit: kg/kg
  • Basis: per 1 kg declared reference product; investigate outliers against raw records
  • Basis kind: Reference flow (reference_flow)
  • Evidence kind: Collected record (collected_record)

Waste flows

Elementary flows

7. Allocation and Co-product Handling

rule_id	Applies to	Rule	source_ids
a_mass	all route nodes	Reconcile lot inputs, accepted grade, downgraded grade, rejects, moisture change, separated shell and free brine by measured mass. A real separately sold grade or shell requires documented revenue and physical quantities; disclose any allocation basis, do not assign a universal split.	fao-improved-snail-farming
a_period	managed cohorts and reusable assets	Link juvenile stock, feed, enclosure maintenance and breeding-stock replacement to actual cohorts and reporting periods. Record opening/closing biological stock and termination; allocate burdens to output periods without reusing the same input in another period.	fao-improved-snail-farming
a_shared	enclosures, preparation, cold rooms and package reuse	Record the asset/service, consuming nodes and service periods; use measured occupancy, throughput, metered consumption or another evidenced causal driver and charge each service once. Wild routes omit non-consumed farm assets.	fao-improved-snail-farming

Concrete cards do not inherit numerical ranges from the former aggregate card. Determine quantities from original records, stock/meter reconciliation and the declared reference flow; no default quantity or numeric screen is supplied without evidence matching the identity, unit, period and boundary. Missing range evidence is a quality disclosure, not zero use or proof of completeness.

rule_id	Applies to	Rule	source_ids
allocation_residual_precedence	remaining common burden with no specified primary branch	Resolve any study-specific joint-product instruction in this PCR that has no specified primary branch using this precedence; retain an already explicitly prescribed category-specific primary method. First directly assign separable output-specific activities. For the remaining common burden B, use a physical driver d_i only when measured operation or biological-service records demonstrate the causal consumption represented by that driver. A product being weighable, valuable or lower grade alone is insufficient; do not switch arbitrarily between area, time, mass and revenue. For comparable grades receiving the same common handling, measured processed mass is applicable only with the same service demand, state and moisture basis demonstrated. Share a_i=d_i/sum(d_j); B_i=Ba_i. If no defensible causal physical driver exists for that common operation, use gate- and period-matched economic shares a_i=(q_ip_i)/sum(q_j*p_j), with the complete independently intended output set, compatible quantity/price units, currency, representative prices and values before output-specific downstream processing. Missing price or denominator evidence makes the allocated result incomplete, not a zero-priced product or a single-output system. Report shares summing to one and sensitivity to a material alternative; an alternative is not an interchangeable primary result. Waste, retained residues and internal transfers receive no co-product share, while their attributable production/handling burdens remain with the producing saleable route. Retain unallocated physical quantities and mass balances separately. This branch gives no automatic substitution credit; any separately scoped substitution analysis retains the gross inventory and its actual displaced-function evidence.	ghg-protocol-product-standard-2011

8. Foreground Data Collection, Calculation, and Quality Rules

Specific input identification before dataset completion

Identify the actual input for this operation from supplier specifications, equipment and primary records. This is a mandatory collection requirement, not an exchange. Before dataset completeness, represent each used material, formulated product, carrier or independently purchased service by one physically specific card with its native quantity/property; confirm a compatible UUID, or retain an explicit unresolved identity and do not claim a fully linked dataset. Do not substitute a conditional example for an unknown actual input, invent a recipe, omit required use or infer zero from missing records. Attribute shared use, reusable assets and inclusive services once; preserve the original stage/period and measured throughput link to final reference output. The former aggregate range is not a component limit or consumption default.

requirement_id	collection_protocol_id	Preserved collection scope
rear_feed_specific_input	cp_rearing	Operation rear: Weigh purchased or on-site feed supplied and separately reconcile intake and leftovers; on-site cultivation is attributed upstream or inside foreground once. Denominator and scope requirements：per kg harvest-ready managed snails Raw quantity and calculation requirements: Use separate feed-supply, intake and loss ledgers under calc_feed_supply_and_intake. The quantity carrying feed-production burden includes in-boundary refusals, spoilage and uneaten feed; it is not reduced to animal intake. Retain source, species/cohort, phase and original mass/moisture basis. Calculate the final contribution with inventory_reference_normalization and stage_throughput_linkage exactly once. Original collection denominator kind: process_output. Original quantity method: Calculate the attributable final-package exchange under inventory_reference_normalization and stage_throughput_linkage using reconciled feed-supply records that retain in-boundary losses and their production burden.
pack_material_specific_input	cp_handover	Operation pack: When a package is used, record its actual product-contact container and protective overpack by material and reuse cycle, without assigning a generic fixed UUID; bulk handover with no package records zero material. Denominator and scope requirements：per kg final net snail product Raw quantity and calculation requirements: Weighed new material plus attributed reusable-package losses per delivery. Original collection denominator kind: process_output. Original quantity method: Calculate the attributable final-package exchange under inventory_reference_normalization and stage_throughput_linkage using the matched raw records.

Data Collection Protocols

protocol_id	process_id	flow_role	record_type	raw_fields	collection_method	unit	frequency	temporal_coverage	site_scope	aggregation_rule	quality_evidence
cp_rearing	rear	cohort stock, feed and output	husbandry log	species, cohort, stock receipts, feed issue/leftover, mortality, ready mass, dates	log plus calibrated scale; Raw aggregation requirements: Use calc_feed_supply_and_intake to distinguish supplied feed carrying production burden, actual intake and losses; preserve all native stock and period records, then normalize the attributable quantity once to accepted final output. rear_feed_specific_input: Operation rear: Weigh purchased or on-site feed supplied and separately reconcile intake and leftovers; on-site cultivation is attributed upstream or inside foreground once. Denominator and scope requirements：per kg harvest-ready managed snails Raw quantity and calculation requirements: Use separate feed-supply, intake and loss ledgers under calc_feed_supply_and_intake. The quantity carrying feed-production burden includes in-boundary refusals, spoilage and uneaten feed; it is not reduced to animal intake. Retain source, species/cohort, phase and original mass/moisture basis. Calculate the final contribution with inventory_reference_normalization and stage_throughput_linkage exactly once. Original collection denominator kind: process_output. Original quantity method: Calculate the attributable final-package exchange under inventory_reference_normalization and stage_throughput_linkage using reconciled feed-supply records that retain in-boundary losses and their production burden. Identify the actual input for this operation from supplier specifications, equipment and primary records. This is a mandatory collection requirement, not an exchange. Before dataset completeness, represent each used material, formulated product, carrier or independently purchased service by one physically specific card with its native quantity/property; confirm a compatible UUID, or retain an explicit unresolved identity and do not claim a fully linked dataset. Do not substitute a conditional example for an unknown actual input, invent a recipe, omit required use or infer zero from missing records. Attribute shared use, reusable assets and inclusive services once; preserve the original stage/period and measured throughput link to final reference output. The former aggregate range is not a component limit or consumption default.	item;kg	each event	full managed cohort and period	actual enclosure	per reference flow	supplier records, stock book, scale calibration; traceable numerator, accepted reference-output denominator and normalization worksheet
cp_harvest	gather	source and raw lot	collection log	route, lawful site/permit, cohort or event, raw mass, incidental material, dates	lot scale and collection record; Raw aggregation requirements: sum raw lots without dual attribution. Apply the existing route, period, conversion and allocation rules; retain raw totals and the measured accepted reference-output denominator for the same scope. Perform final normalization exactly once; do not divide an already normalized amount again.	kg	each event	full gathering event	actual farm or wild site	per reference flow	collection ticket, permit, scale record; traceable numerator, accepted reference-output denominator and normalization worksheet
cp_preparation	prepare	purge, wash and grades	batch log	incoming mass, water, accepted, downgraded, rejects, shell, destination	meter, scale, grade log; Raw aggregation requirements: mass-balance per lot. Apply the existing route, period, conversion and allocation rules; retain raw totals and the measured accepted reference-output denominator for the same scope. Perform final normalization exactly once; do not divide an already normalized amount again.	kg	each lot	every preparation batch	first-processing site	per reference flow	grade specification, scale and meter records; traceable numerator, accepted reference-output denominator and normalization worksheet
cp_preservation	preserve	route and state conversion	recipe and batch log	initial/final mass, temperature/time, moisture, salt, brine, rejects, energy	scale, meter, recipe, lab result; Raw aggregation requirements: state-specific batch balance. Apply the existing route, period, conversion and allocation rules; retain raw totals and the measured accepted reference-output denominator for the same scope. Perform final normalization exactly once; do not divide an already normalized amount again. preserve_medium_specific_input: Measure salt and actual brine or process-water recipe only for salted or brined lots; no generic UUID covers all components. Denominator and scope requirements：per kg stabilized output Raw quantity and calculation requirements: Record each recipe component separately and measure retained versus drained mass. Original collection denominator kind: process_output. Calculate the attributable final-package exchange under inventory_reference_normalization and stage_throughput_linkage using the matched raw records. Identify the actual input for this operation from supplier specifications, equipment and primary records. This is a mandatory collection requirement, not an exchange. Before dataset completeness, represent each used material, formulated product, carrier or independently purchased service by one physically specific card with its native quantity/property; confirm a compatible UUID, or retain an explicit unresolved identity and do not claim a fully linked dataset. Do not substitute a conditional example for an unknown actual input, invent a recipe, omit required use or infer zero from missing records. Attribute shared use, reusable assets and inclusive services once; preserve the original stage/period and measured throughput link to final reference output. The former aggregate range is not a component limit or consumption default.	kg;kWh	each performed intervention	all preserved lots	actual plant	per reference flow	recipe, moisture test, energy bill; traceable numerator, accepted reference-output denominator and normalization worksheet
cp_utilities	rear;gather;prepare;preserve	water and energy	meter or fuel record	meter start/end, carrier, node, period, shared driver	meter and invoice reconciliation; Raw aggregation requirements: allocate once by measured driver. Apply the existing route, period, conversion and allocation rules; retain raw totals and the measured accepted reference-output denominator for the same scope. Perform final normalization exactly once; do not divide an already normalized amount again.	kg;kWh;MJ	per meter period	full cohort or service period	consuming nodes	per reference flow	calibration, bills, allocation worksheet; traceable numerator, accepted reference-output denominator and normalization worksheet
cp_handover	pack	packing and final lot	dispatch record	incoming state, net mass, package tare/reuse, gate, customer handover	calibrated scale and dispatch ticket; Raw aggregation requirements: sum net accepted sale mass by state. Apply the existing route, period, conversion and allocation rules; retain raw totals and the measured accepted reference-output denominator for the same scope. Perform final normalization exactly once; do not divide an already normalized amount again. pack_material_specific_input: Operation pack: When a package is used, record its actual product-contact container and protective overpack by material and reuse cycle, without assigning a generic fixed UUID; bulk handover with no package records zero material. Denominator and scope requirements：per kg final net snail product Raw quantity and calculation requirements: Weighed new material plus attributed reusable-package losses per delivery. Original collection denominator kind: process_output. Original quantity method: Calculate the attributable final-package exchange under inventory_reference_normalization and stage_throughput_linkage using the matched raw records. Identify the actual input for this operation from supplier specifications, equipment and primary records. This is a mandatory collection requirement, not an exchange. Before dataset completeness, represent each used material, formulated product, carrier or independently purchased service by one physically specific card with its native quantity/property; confirm a compatible UUID, or retain an explicit unresolved identity and do not claim a fully linked dataset. Do not substitute a conditional example for an unknown actual input, invent a recipe, omit required use or infer zero from missing records. Attribute shared use, reusable assets and inclusive services once; preserve the original stage/period and measured throughput link to final reference output. The former aggregate range is not a component limit or consumption default.	kg	each lot	all accepted sale lots	actual handover site	per reference flow	weighing ticket and lot trace; traceable numerator, accepted reference-output denominator and normalization worksheet
cp_residues	rear;gather;prepare;preserve;pack	wastes and loss	disposal and balance log	composition, mass, destination, reason, period	weigh and disposal receipt; Raw aggregation requirements: sum each segregated destination once. Apply the existing route, period, conversion and allocation rules; retain raw totals and the measured accepted reference-output denominator for the same scope. Perform final normalization exactly once; do not divide an already normalized amount again. pack_reject_specific_output: Keep damaged packages and rejected goods lot mass separate and assign actual recovery or disposal destinations. Denominator and scope requirements：per kg final net snail product Raw quantity and calculation requirements: Weigh by material and reason for rejection. Original collection denominator kind: process_output. Calculate the attributable final-package exchange under inventory_reference_normalization and stage_throughput_linkage using the matched raw records. This is a mandatory output-identification requirement, not an aggregate exchange. Preserve every actual co-product, reject, packaging waste and treatment stream in this operation. Before dataset completeness create separate cards for physically distinct streams, with actual material/state, quantity, destination and Product/Waste role. A genuinely mixed waste stream may remain one physically defined mixture with measured composition; do not invent separation or count its components again. Keep unlike units separate, retain the original allocation and reference normalization, and reconcile the output balance. Identify actual functions before co-product allocation; waste does not acquire a co-product share merely by having mass. Confirm a compatible UUID or explicitly retain its unresolved identity. Missing records never establish zero or exclusion. rear_residue_specific_output: Record spent feed, rejected animals and bedding as segregated waste destinations; separately sold material is not waste. Denominator and scope requirements：per kg harvest-ready managed snails Raw quantity and calculation requirements: Weigh or estimate from documented disposal records. Original collection denominator kind: process_output. Calculate the attributable final-package exchange under inventory_reference_normalization and stage_throughput_linkage using the matched raw records. This is a mandatory specific-output collection requirement, not a selected exchange. Preserve every actual waste, residue, reject and co-product from this operation. Create separate cards for physically distinct streams with actual material, composition/state, quantity, receiving route and Product/Waste role before dataset completeness; verify a compatible UUID or explicitly retain its unresolved identity. A genuinely mixed stream may remain one physically defined mixture supported by composition records; never invent separation or count its components again. Keep liquid and solid treatment quantities separate. Preserve original period, output balance, reference normalization and allocation rules; missing records do not establish zero or exclusion.	kg	each event	all foreground periods	actual node	per reference flow	receipts and mass-balance record; traceable numerator, accepted reference-output denominator and normalization worksheet
cp_feed_supply_and_intake	rear	Feed supply, intake and loss	stock, receipt, issue and loss ledger	feed identity/source; cohort/phase; period; opening/closing stock; receipts; on-site provision; unused returns/transfers; uneaten/spoiled mass and destination; as-fed/DM; actual intake; burden owner; accepted final output	Reconcile matched stock, scales, ration/forage estimates and disposal records under calc_feed_supply_and_intake. Keep raw totals and stage denominators; assign production and treatment burden once, then normalize to accepted final output.	kg as-fed; kg DM	each issue and period close	complete represented cohort/period	actual operated feeding nodes	per reference flow	stock and supplier records; moisture evidence; loss and no-duplication reconciliation

Calculation Rules

rule_id	Applies to	Formula or rule	Inputs	Output	source_ids
c_net	final lot	net snail mass = gross delivered mass minus package tare minus separately reported free brine; retain product-incorporated salt and moisture in as-sold mass	cp_handover;cp_preservation	kg net product	fao-improved-snail-farming
c_balance	prepare and preserve	incoming measured mass plus incorporated water/salt = accepted plus downgraded plus rejects plus measured loss and change in stock; report unexplained residual	cp_preparation;cp_preservation;cp_residues	kg balance residual	fao-improved-snail-farming
c_dry	state comparison	dry snail solids = measured snail mass times (1 minus measured moisture fraction), after identifying salt solids separately; no universal fresh/dried conversion	cp_preservation	kg dry snail solids	fao-improved-snail-farming
c_unit	all inputs	normalized input = attributable measured input divided by net accepted mass in same state and lot cohort; zero denominators fail	cp_rearing;cp_harvest;cp_utilities;cp_handover	input per kg reference
calc_feed_supply_and_intake	rear_feed	Feed supply used by the represented operation = opening feed stock + receipts + on-site feed entering the operation - closing feed stock - documented unused returns or transfers out. Retain in-boundary spoilage, refusals and discarded leftovers in that supply. Actual intake = that supply - measured uneaten/discarded losses, after matching moisture/DM and period; use intake only for nutrition/metabolism. Opening stock retains its prior burden and is not another purchase. Trace any unused return or transfer and its burden destination; no automatic substitution credit. Attribute production once, through either the purchased-feed dataset or the represented on-site crop/collection node, never both for the same feed. Include actual waste treatment and manure contributions once, not as a second feed-production burden.	cp_feed_supply_and_intake	separate feed supply, intake and loss quantities, in matched as-fed/DM units	fao-feed-loss-accounting-2018

Data Quality Requirements

requirement_id	Applies to	Requirement	Evidence
q_identity	all lots	Species, non-sea identity, managed/wild origin, legality, intended use, applicable quality criterion, whole/shelled form and actual sale state must be traceable. Food-safety evidence is required when sold for human food.	supplier, collection and batch records
q_mass	all nodes	Calibrated gross/tare weighing and a reported balance residual; distinguish shell, package and free brine.	calibration and batch balance
q_time	managed/shared nodes	Cohort, asset/service periods and replacement events linked; no duplicated shared burden.	period ledger and allocation worksheet
q_gap	unresolved identities	Concrete flow UUIDs and actual carrier/packaging/waste identities require foreground confirmation before dataset exchange generation.	identity-resolution log

9. Validation Rules

rule_id	Applies to	Rule	source_ids
v_scope	reference lot	Fail if species is sea snail, route or intended use is unrecorded, the listed sale state is absent, or actual handover gate is missing. Apply food-safety checks only to human-food lots.	un-cpc-3-notes
v_route	process map	Managed lots require rearing plus harvest; lawful wild lots require harvest with no artificial rearing node. Reconcile input source, prepared grades and one state-specific preservation branch if used.	fao-improved-snail-farming;fao-snail-farming-gathering
v_balance	every batch	Require nonnegative measured net product, explicit rejects and moisture/brine balance; investigate residual beyond site measurement tolerance instead of imposing a universal yield.	fao-improved-snail-farming
v_attribution	periods and shared assets	Reject duplicated cohort inputs or shared enclosure, washing, cold-room or packaging burdens; record drivers, periods and consuming nodes.	fao-improved-snail-farming
v_uuid	all exchanges	Do not release a concrete flow exchange from unresolved semantic cards; verify product state, gate, property and unit before final dataset use.
v_foreground_emission_responsibility	Actual operated nodes and linked services	Record responsibility for on-site fuel combustion and refrigerant leakage when applicable: either quantified foreground emissions or a named linked process explicitly covering them, never merely a fuel-supply or electricity-production input. Assess special-taxon biological and residue emissions using species/route evidence, without a generic livestock factor. Identify any unresolved pathway and withhold a completeness claim; document supported absence and prevent duplicate upstream/downstream accounting.
v_feed_supply_intake_separation	All feed inputs	Reject an upstream feed inventory reduced by in-boundary refusal, spoilage or discarded leftovers without retaining their production burden. Reconcile supply, intake, stock, transfers and loss destinations under calc_feed_supply_and_intake. Do not reuse intake as supplied feed, assume zero-burden on-site feed or grant automatic avoided-product credits.	fao-feed-loss-accounting-2018

10. Published Dataset Profile

Field	Value
dataset_role	State-, intended-use- and route-qualified foreground product dataset for non-sea snail goods.
downstream_use	Candidate secondary_dataset or background_dataset after concrete exchange identities, review and publication.
allowed_use	Compare lots with same species/presentation/state/gate, or normalize by measured dry solids with explicit assumptions.
excluded_use	Sea snails; goods beyond the listed sale states; generic fresh-to-dried substitution; post-gate retail, cooking or unsupported UUID binding.
required_metadata	Species, route legality, intended use and applicable quality criterion, cohort/event, whole/shelled, sold state, net mass, moisture/free brine, gate, site and periods.
required_quality_disclosure	Mass balance, grades/rejects, foreground measurement coverage, preservation recipe, shared-asset allocation and unresolved identities.
update_trigger	New verified exact snail flow, changed source route, preservation technique, gate, or measured evidence.

11. Data Sources

Source id	Type	Reference	Used for
un-cpc-3-notes	official_guidance	United Nations CPC Version 3.0 explanatory notes	Category definition and exclusion of sea snails.
fao-improved-snail-farming	official_guidance	FAO, Improved Snail Farming	Managed rearing, harvest, handling and product-route decomposition.
fao-snail-farming-gathering	official_guidance	FAO, Snail Farming and Gathering	Distinguish managed production from collection of wild snails.
fao-feed-loss-accounting-2018	official_guidance	FAO 2018, Environmental performance of pig supply chains, section 11.2.2	Feed supply versus intake and waste burden, not animal parameters. Applying this accounting principle to the declared taxon is this PCR's methodological choice; no pig diet or emission factor is transferred.
fao-agricultural-energy	official_guidance	FAO Energy demand and consumption in African agriculture, Annex C case-study results, https://www.fao.org/4/v9766e/v9766e08.htm	conditional concrete identities and method context; does not establish site use or quantities
ghg-protocol-product-standard-2011	standard	WRI/WBCSD, Product Life Cycle Accounting and Reporting Standard (2011), Chapter 9, https://ghgprotocol.org/sites/default/files/standards/Product-Life-Cycle-Accounting-Reporting-Standard_041613.pdf	General allocation hierarchy and comparable-gate economic basis. Applicability conditions and the explicit residual branch are this PCR's method convention; no product-specific causal coefficient, price or output quantity is prescribed by this source.