@_linked/dcmi

DCMI Metadata Terms for Linked: the Dublin Core vocabularies as Turtle, an accessor for every term, and the Image shape. The package mirrors the three namespaces and holds only their terms.

Ontologies

Import a module as a namespace:

import * as dcterms from '@_linked/dcmi/ontologies/dcterms';

@literalProperty({path: dcterms.title}) get title(): string {…}

Each module has one named export per term; ontologies/<prefix>.data holds ns, dataFiles, _ontologyResource and loadData(). A term's export name is its local name made an identifier (dcterms:ISO639-2 → dcterms.ISO639_2). linked generate-ontology writes the modules from the data (package.json "linkedOntologies"), and linked build fails when they are stale; never edit them by hand.

The data

The data is DCMI's latest release, DCMI Metadata Terms, Date Issued 2020-01-20, as DCMI publishes it in Turtle, unchanged apart from a leading comment that names the source:

To refresh, download each file, put the comment back with the new release date, update the -added files' version, and run npx linked generate-ontology.

The official files are the only source of the package's terms: the package never adds a class or property to a standard's namespace. What the published standard lacks, mainly metadata, goes in one extra file per prefix, src/data/<prefix>-added.ttl, listed in "linkedOntologies"' data:

• the ontology entity itself: owl:Ontology, title, description, vann:preferredNamespacePrefix, vann:preferredNamespaceUri, the source URL and version;
• annotations on terms the standard already defines, such as a missing rdfs:label.

New classes or properties never go there; a term a standard lacks belongs in the consumer's own ontology package.

DCMI's files describe each namespace (title, publisher, modified) but do not declare it an owl:Ontology, so dc-added.ttl, dcterms-added.ttl and dcmitype-added.ttl add the ontology entity, the preferred prefix and namespace, and the source and version.

Development

npx linked build    # checks the ontology modules, compiles, writes lib/esm/data/shapes.ttl
npm test            # runs against lib/

Data license

The package code is MIT licensed (see LICENSE). The bundled ontology data is derived from the DCMI Metadata Terms (https://www.dublincore.org/specifications/dublin-core/dcmi-terms/) published by the Dublin Core Metadata Initiative and is not covered by the MIT license: it remains under the Creative Commons Attribution 4.0 International (CC BY 4.0), https://creativecommons.org/licenses/by/4.0/. See NOTICE.