Tag Scheme

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

A namespaced set of tags — a project vocabulary, a personal tag bucket, or a controlled vocabulary. Multi-tenant: many schemes coexist, and a tag may belong to zero or more schemes (gmeow:tagInScheme). The counterpart of skos:ConceptScheme and schema:DefinedTermSet.

Structure

Subclass of: gmeow:InformationObject

Practical Pattern

Use gmeow:TagScheme 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: 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 bucket tags into a namespace — a personal tag set, a project vocabulary, or a curated controlled vocabulary — so folksonomy and controlled-vocabulary tags can coexist under distinct scheme identities.

Avoid when

• Avoid forcing a tag into exactly one scheme (membership is many-valued via gmeow:tagInScheme) and avoid using a scheme to assert hierarchy — broader/narrower relations live on the tags themselves.

How to use

• Mint the scheme as an individual and link tags to it with gmeow:tagInScheme; a tag may be cross-listed in several schemes, and a Tagging act may name the scheme it was performed under via gmeow:taggingScheme.

Examples

• ex:projectVocab a gmeow:TagScheme; rdfs:label "Project vocabulary"@en.