@prefix dcterms: <http://purl.org/dc/terms/> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix ts: <https://test.uncefact.org/vocabulary/term-status/> .
@prefix unece: <https://test.uncefact.org/vocabulary/> .

<https://test.uncefact.org/vocabulary/chain-of-custody-method/book-and-claim> a skos:Concept ;
    skos:definition "The physical material and the claim are fully decoupled, with credits for the claimed attribute issued and traded independently of the goods."@en ;
    skos:inScheme unece:chain-of-custody-method ;
    skos:notation "book-and-claim" ;
    skos:prefLabel "Book and claim"@en ;
    skos:scopeNote "The weakest physical link. A holder of the credit makes the claim; the material they received may have none of the attribute."@en .

<https://test.uncefact.org/vocabulary/chain-of-custody-method/controlled-blending> a skos:Concept ;
    skos:definition "Conforming and non-conforming material are physically mixed in a known, fixed proportion, and that proportion is tracked through production."@en ;
    skos:inScheme unece:chain-of-custody-method ;
    skos:notation "controlled-blending" ;
    skos:prefLabel "Controlled blending"@en ;
    skos:scopeNote "The output carries a stated percentage of conforming content rather than a whole-output claim. Also called fixed or guaranteed blending."@en .

<https://test.uncefact.org/vocabulary/chain-of-custody-method/controlled-mass-balance> a skos:Concept ;
    skos:definition "As mass balance, except that every input must meet a baseline set of requirements, with volumes meeting further criteria reconciled administratively."@en ;
    skos:inScheme unece:chain-of-custody-method ;
    skos:notation "controlled-mass-balance" ;
    skos:prefLabel "Controlled mass balance"@en ;
    skos:scopeNote "Addresses the case where non-conforming material must be excluded outright rather than merely accounted for. It is therefore the model that speaks to contamination, where mass balance speaks to over-selling."@en .

<https://test.uncefact.org/vocabulary/chain-of-custody-method/identity-preservation> a skos:Concept ;
    skos:definition "Material from a single specified source is kept physically separate from all other material throughout the chain."@en ;
    skos:inScheme unece:chain-of-custody-method ;
    skos:notation "identity-preservation" ;
    skos:prefLabel "Identity preservation"@en ;
    skos:scopeNote "The strongest link between product and claim: the claim rests on the specific source itself, which remains identifiable at the output."@en .

<https://test.uncefact.org/vocabulary/chain-of-custody-method/mass-balance> a skos:Concept ;
    skos:definition "Conforming and non-conforming material are physically mixed, and the conforming volume is reconciled administratively against the volume of output sold as conforming."@en ;
    skos:inScheme unece:chain-of-custody-method ;
    skos:notation "mass-balance" ;
    skos:prefLabel "Mass balance"@en ;
    skos:scopeNote "Physical and administrative flows are linked by volume accounting rather than by the material itself. The output sold as conforming cannot exceed the conforming input, allowing for waste and losses."@en .

<https://test.uncefact.org/vocabulary/chain-of-custody-method/segregation> a skos:Concept ;
    skos:definition "Conforming material from several sources may be combined, but is kept physically separate from non-conforming material."@en ;
    skos:inScheme unece:chain-of-custody-method ;
    skos:notation "segregation" ;
    skos:prefLabel "Segregation"@en ;
    skos:scopeNote "The output is wholly conforming, but the contribution of any individual source is no longer distinguishable."@en .

unece:chain-of-custody-method a skos:ConceptScheme ;
    rdfs:label "Chain of Custody Method"@en ;
    dcterms:source <https://isealalliance.org/get-involved/resources/chain-custody-models-and-definitions-v2-2025> ;
    skos:definition "Chain of Custody Method UN/CEFACT code list."@en ;
    skos:note "The method belongs to the claim, not to the process. One facility, one production run and one set of traceability events can support a segregated claim for one attribute and a mass-balance claim for another. A claim resting on no chain of custody model carries no value from this list."@en ;
    skos:scopeNote "How the physical flow of material supports a claim made about it. The six models follow the ISEAL Chain of Custody Models and Definitions Guidance v2 (2025), which describes them in terms of certified material; ISO 22095:2020 defines an equivalent generic set."@en ;
    unece:codeListScope <https://test.uncefact.org/vocabulary/code-list-scope/shared> ;
    unece:termStatus ts:proposed .