com.t0ronto.commons.attestation
Schema Diff
+4 -24
Compatibility Analysis
Backward Compatible
No changes detected.
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{
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"id": "com.t0ronto.commons.attestation",
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"defs": {
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"main": {
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"key": "tid",
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"type": "record",
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"record": {
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"type": "object",
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"required": [
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"subject",
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"predicate",
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"createdAt"
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],
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"properties": {
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"graph": {
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"type": "string",
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"description": "Optional sub-grouping token for batch-authored attestations (e.g. \"geocode-sync\", \"lcsh-import\"). Provenance proper — author and time — comes from the record's repo and commit, not from this field.",
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"maxGraphemes": 128
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},
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"subject": {
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"type": "string",
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"format": "at-uri",
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"description": "The anchor this claim is about — a com.t0ronto.commons.entity at-uri. May also be another attestation's at-uri, which lets you attest about an attestation (reification / edge-metadata) without leaving the model."
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},
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"createdAt": {
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"type": "string",
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"format": "datetime",
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"description": "Client-declared timestamp when the attestation was authored."
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},
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"objectLit": {
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"ref": "#literal",
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"type": "ref",
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"description": "Object as a scalar literal — a property value. External-world URIs (an LCSH or Wikidata alignment target, a canonical link) are literals with datatype xsd:anyURI, never objectRef — objectRef is reserved for edges inside our own graph. Exactly one of objectRef / objectLit / objectStruct must be present."
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},
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"objectRef": {
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"type": "string",
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"format": "at-uri",
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"description": "Object as an internal reference — an edge to another anchor (or, for `retracts`, to the attestation being retracted). Use for graph relations: instanceOf, mainSubject, locatedIn, broader, audience, cadence. Exactly one of objectRef / objectLit / objectStruct must be present (enforced by the index, not the lexicon)."
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"description": "Object as an at-uri reference — an edge to another entity (or, for the retracts predicate, to the attestation being retracted). Used for graph relations: instanceOf, mainSubject, locatedIn, broader, audience, cadence, inScheme. Exactly one of objectRef / objectLit / objectStruct must be present (enforced by the index, not the lexicon)."
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},
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"predicate": {
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"type": "string",
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"description": "The relation asserted. Open vocabulary so the commons can grow; knownValues are the curated core. Edge-style predicates (instanceOf, mainSubject, audience, cadence, locatedIn, broader, inScheme, retracts) take an objectRef; property-style predicates (label, description, link, and the alignment predicates) take an objectLit; compound predicates (address, geo, social) take an objectStruct. `instanceOf` may take an objectRef (an internal type concept) OR an objectLit with datatype xsd:anyURI (an external class such as skos:Concept — this is how an anchor is attested to be a vocabulary concept).",
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"knownValues": [
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"label",
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"description",
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"link",
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"instanceOf",
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"mainSubject",
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"audience",
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"cadence",
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"locatedIn",
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"broader",
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"inScheme",
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"address",
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"geo",
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"social",
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"exactMatch",
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"closeMatch",
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"broadMatch",
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"narrowMatch",
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"sameAs",
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"retracts"
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]
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"format": "at-uri",
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"description": "The relation asserted, as an at-uri to a project predicate entity (com.t0ronto.commons.entity, instanceOf the project's Property class). Project predicate entities are minted on t0ronto.com's repo (the commons authority); their canonical at-uris are listed in scripts/predicate_seed.json. External vocabularies (rdfs:label, skos:broader, wd:P276) are not used directly as predicate strings — they enter the model as sameAs attestations on the project predicate entity, with objectLit datatype xsd:anyURI. This keeps every identity in the system substrate-native (at-uri) so backlink discovery, retraction, alignment, and curation all work uniformly. Phase 8."
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},
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"objectStruct": {
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"refs": [
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"community.lexicon.location.address",
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"community.lexicon.location.geo",
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"community.lexicon.location.fsq",
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"community.lexicon.location.hthree",
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"com.t0ronto.commons.defs#social"
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],
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"type": "union",
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"description": "Object as a compound value: a postal address, geo point, Foursquare POI, H3 cell, or social-platform presence. Reuses the community.lexicon.location.* vocabulary deliberately rather than redefining it. Exactly one of objectRef / objectLit / objectStruct must be present."
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}
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}
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},
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"description": "A single attestation in the t0ronto data commons: one quad asserting that `subject` stands in relation `predicate` to an object. The object is exactly one of `objectRef` (a reference to another anchor — an edge in the graph), `objectLit` (a scalar literal — a property value), or `objectStruct` (a compound value such as an address or social handle). Provenance is intrinsic and is NOT carried as fields: the record is signed by the repo's DID and stamped by the commit, so who-attested-it and when fall out of the substrate. Append-only by convention — corrections are new attestations (see the `retracts` predicate), not edits. rkey is a TID."
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"description": "A single attestation in the t0ronto data commons: one quad asserting that `subject` stands in relation `predicate` to an object. Subject is an at-uri (a project entity, or another attestation in the retracts case). Predicate is an at-uri to a project predicate entity (see scripts/predicate_seed.json). Object is exactly one of `objectRef` (an at-uri reference to another entity — an edge in the graph), `objectLit` (a scalar literal — a property value; external IRIs live here as xsd:anyURI), or `objectStruct` (a compound value such as an address or social handle). Provenance is intrinsic and is NOT carried as fields: the record is signed by the repo's DID and stamped by the commit, so who-attested-it and when fall out of the substrate. Append-only by convention — corrections are new attestations (see the retracts predicate), not edits. rkey is a TID. Phase 8: every identity in the model — subject, predicate, objectRef — is an at-uri; the only strings are literals."
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},
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"literal": {
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"type": "object",
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"required": [
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"value"
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],
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"properties": {
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"lang": {
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"type": "string",
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"description": "BCP-47 language tag, used when datatype is rdf:langString. Lets the same subject carry labels/descriptions in multiple languages as separate attestations (e.g. an `en` label and a `fr` label)."
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},
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"value": {
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"type": "string",
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"description": "The literal value, lexically encoded per its datatype (e.g. \"43.6532\" for an xsd:decimal, an ISO-8601 string for an xsd:dateTime, the full URI for an xsd:anyURI).",
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"maxGraphemes": 2000
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},
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"datatype": {
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"type": "string",
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"default": "xsd:string",
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"description": "XSD/RDF datatype as a CURIE or URI. Common values: xsd:string, xsd:anyURI (external-vocab targets and links), xsd:dateTime, xsd:decimal, xsd:boolean, rdf:langString."
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}
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},
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"description": "A scalar literal value with an XSD datatype. Numbers, dates, and URIs are carried in their lexical (string) form, tagged by `datatype`."
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}
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},
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"$type": "com.atproto.lexicon.schema",
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"lexicon": 1
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}