Lexicon Garden

com.t0ronto.commons.attestation

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.

Repository @t0ronto.com did:plc:aux2optnbxmnea7ijbfca3ak namespace authority
Details · record, key tid
Kindrecord
Record keytid
Authoritycommons.t0ronto.com
Indexed
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Record

record · key tid

Properties

createdAt

requiredstring · datetime

Client-declared timestamp when the attestation was authored.

graph

string

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.

  • maxGraphemes: 128

objectLit

ref

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.

Reference

objectRef

string · at-uri

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).

objectStruct

union

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.

One of

predicate

requiredstring · at-uri

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.

subject

requiredstring · at-uri

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.

#literal

object

A scalar literal value with an XSD datatype. Numbers, dates, and URIs are carried in their lexical (string) form, tagged by `datatype`.

Properties

datatype

string

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.

  • default: "xsd:string"

lang

string

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).

value

requiredstring

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).

  • maxGraphemes: 2000

Similar lexicons

semantic match

Lexicons whose schemas describe something close to this one. Check them before publishing a new one that overlaps.

  • com.t0ronto.commons.entity

    record

    An anchor in the t0ronto data commons: a bare, claim-free identity for a thing — an organization, programme, venue, neighbourhood, or a vocabulary concept. The anchor holds NO properties of its own. Everything true of it — name, type, topics, location, prefLabel, broader, alignments — is asserted by separate com.t0ronto.commons.statement records, which may be authored by many different DIDs. The anchor exists only to mint a stable, resolvable identity that statements point at. Whether an anchor