Tag

• CURIE: gmeow:Tag
• IRI: https://blackcatinformatics.ca/gmeow/Tag
• Category: class
• Defined by: gmeow:slices/tags

An open, user-minted tag — an information object whose identity is its IRI and whose surface form is carried by rdfs:label. Synonyms are multiple labels; homonyms are different IRIs. Coreference is done in data, never by collapsing into one. A tag is NOT a type (it carries no inferential weight over rdf:type) and NOT a property bag — no datatype value property is asserted on it. Part of the universal tagging building block that keeps folksonomy, aboutness and typing as three orthogonal axes.

Structure

Subclass of: gmeow:InformationObject

Practical Pattern

Use gmeow:Tag as a specialized kind of gmeow:InformationObject. Add statement metadata or a standpoint when the assertion needs provenance, confidence, or vantage.

Example Snippets

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

Folksonomy

• Source: slices/core/tags/examples/folksonomy.ttl
• Examples catalog: open in catalog#example-slices-core-tags-examples-folksonomy

# SPDX-FileCopyrightText: 2026 Blackcat Informatics® Inc. <paudley@blackcatinformatics.ca>
# SPDX-License-Identifier: CC-BY-4.0
#
# Worked example: tagging is flat-first, reified on demand ( P4). A bare
# gmeow:hasTag covers "this is tagged X". Tags themselves form a SKOS-style poly-
# hierarchy (gmeow:broaderTag / gmeow:narrowerTag / gmeow:relatedTag) inside a
# gmeow:TagScheme. When the PROVENANCE of a tagging matters — who applied it, in
# which scheme — it is promoted to a reified gmeow:Tagging relator binding tagger
# × tagged × tag × scheme, so a contested or machine-applied tag is auditable.
@prefix gmeow: <https://blackcatinformatics.ca/gmeow/> .
@prefix ex:    <https://blackcatinformatics.ca/gmeow/examples/tags/> .
@prefix rdfs:  <http://www.w3.org/2000/01/rdf-schema#> .

# --- A scheme and a small tag hierarchy within it.
ex:scheme a gmeow:TagScheme ; rdfs:label "Research topic keywords"@en .

Common Companion Terms

gmeow:InformationObject

Projects To

External Equivalences

Equivalent or closely aligned targets: moat, schema, skos

Linkages

Generated from the canonical mapping DSL. SSSOM files are the generated public interchange form for term equivalences.

Term Equivalences

Projection Coverage

Usage Advice

Use when

• Use to mint an informal, user-applied label whose identity is its IRI — a folksonomy keyword that classifies entities without the inferential weight of a type or the subject-matter commitment of aboutness.

Avoid when

• Avoid when the label should change what an entity IS (use rdf:type and a real sortal) or record what a resource is ABOUT (use gmeow:isAbout); a tag is a co-equal label, never a type or a subject relation.

How to use

• Mint the tag as an individual, carry its surface form on rdfs:label (multiple labels for synonyms, distinct IRIs for homonyms), and attach it with gmeow:hasTag; resolve coreference in data rather than collapsing two tags with owl:sameAs.

Examples

• ex:tagUrgent a gmeow:Tag; rdfs:label "urgent"@en.