GTS head id

CURIE: gmeow:gtsHeadId
IRI: https://blackcatinformatics.ca/gmeow/gtsHeadId
Category: property
Defined by: gmeow:slices/gts
Box roles: ConfigBox role, RBox role (What is this?)

The chain head of a segment — the content-id of its last frame, written 'blake3:'. Transitively commits to the segment's entire history (spec §9.1), making it a version fingerprint of the segment rather than a digest of its bytes: hence a subproperty of gmeow:versionFingerprint, distinct from gmeow:contentDigest (which is byte-exact identity and applies to the file or a blob as a whole). Functional: a segment has exactly one head.

Structure

Property shape: datatype property; gmeow:GTSSegment -> xsd:string; functional Sub-property of: gmeow:versionFingerprint

Practical Pattern

Use gmeow:gtsHeadId from gmeow:GTSSegment to xsd:string when the relationship itself belongs in the native GMEOW graph.

Example Snippets

These snippets are generated from canonical slice examples and trimmed to the Turtle blocks where this term appears.

Dist Package

Source: slices/core/gts/examples/dist-package.ttl
Examples catalog: open in catalog#example-slices-core-gts-examples-dist-package

@prefix gmeow: <https://blackcatinformatics.ca/gmeow/> .
@prefix ex:    <https://blackcatinformatics.ca/gmeow/examples/> .
@prefix rdfs:  <http://www.w3.org/2000/01/rdf-schema#> .
@prefix xsd:   <http://www.w3.org/2001/XMLSchema#> .



ex:gts-dist-segment-core
    a gmeow:GTSSegment ;
    rdfs:label "core dist segment"@en ;
    gmeow:gtsSegmentOf ex:gts-dist-package-001 ;
    gmeow:embodies ex:gmeow-ontology-expression-001 ;
    gmeow:gtsSegmentIndex "0"^^xsd:nonNegativeInteger ;
    gmeow:gtsHeadId "blake3:929d046b2300eb09424f2d46b07fb793ad97ddde5e9fdb25ebefe245e8da8be8" ;
    gmeow:gtsProfile gmeow:gtsProfileDist ;
    gmeow:usesTransformCodec gmeow:codecZstd .

ex:gts-dist-segment-music
    a gmeow:GTSSegment ;
    rdfs:label "appended music-extension segment"@en ;
    gmeow:gtsSegmentOf ex:gts-dist-package-001 ;
    gmeow:embodies ex:gmeow-ontology-expression-001 ;
    gmeow:gtsSegmentIndex "1"^^xsd:nonNegativeInteger ;
    gmeow:gtsHeadId "blake3:167704cc2c533090b63ff3bf38b4fcff2bb70b33f996aa22f53025044e310ee8" ;
    gmeow:gtsProfile gmeow:gtsProfileGeneric ;
    gmeow:usesTransformCodec gmeow:codecZstd .

Ai Offline Replay

Source: slices/extensions/dreaming/examples/ai-offline-replay.ttl
Examples catalog: open in catalog#example-slices-extensions-dreaming-examples-ai-offline-replay

@prefix gmeow: <https://blackcatinformatics.ca/gmeow/> .
@prefix ex:    <https://blackcatinformatics.ca/gmeow/examples/dreaming/ai-offline-replay/> .
@prefix rdfs:  <http://www.w3.org/2000/01/rdf-schema#> .
@prefix skos:  <http://www.w3.org/2004/02/skos/core#> .
@prefix xsd:   <http://www.w3.org/2001/XMLSchema#> .



ex:lillithMemoryPackage a gmeow:GTSSegment ;
    rdfs:label "Lillith's agent-memory package"@en ;
    rdfs:comment "A GTS segment carrying grounded knowledge plus provenance and standpoints for AI consumption."@en ;
    gmeow:embodies ex:lillithMemoryExpression ;
    gmeow:gtsSegmentIndex "0"^^xsd:nonNegativeInteger ;
    gmeow:gtsHeadId "blake3:7a3b9c2d4e5f60718293a4b5c6d7e8f9012345678901234567890abcdef12345" ;
    gmeow:gtsProfile gmeow:gtsProfileAiPackage .

Common Companion Terms

gmeow:versionFingerprint, gmeow:GTSSegment

Usage Advice

Use when

Use to commit to a segment's entire history with a single chain head — the version-fingerprint identity used to cite a segment, build a document's composite identity, or keep a compaction source citable.

Avoid when

Avoid for byte-exact identity of the file or a blob (use gmeow:contentDigest) and avoid asserting more than one head per segment; the head is functional and commits transitively to the chain.

How to use

Record the last frame's content-id as 'blake3:'; order heads by gmeow:gtsSegmentIndex to form the document's identity, and keep the head on a derived-from source so old transport claims stay citable after compaction.

Examples

ex:seg0 gmeow:gtsHeadId "blake3:9f2c4e…".