# rdf-vocab
Common OWL/RDFS Vocabularies for use with Ruby [RDF.rb][]

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## Extensions
This gem extends `RDF::Vocabulary` with `#to_ttl`, `#to_jsonld`, and `#to_html` methods to create special-purpose vocabulary serializations. The HTML version is templated using a Haml template to allow output to be customized.

Also extends `RDF::Vocabulary::Format` with the `gen-vocab` command extension to the `rdf` executable.

### Limiting vocabularies used for lookup

As loading vocabularies can dominate processing time, the `RDF::Vocabulary.limit_vocabs` method can be used to set a specific set of vocabularies over which to reason. For example:

    RDF::Vocabulary.limit_vocabs(:rdf, :rdf, :schema)

will limit the vocabularies which are returned from `RDF::Vocabulary.each`, which is used for reasoning and other operations over vocabularies and terms.

## Vocabularies

* RDF::Vocab::ACL       - [Web Access Control](http://www.w3.org/wiki/WebAccessControl) (W3C)
* RDF::Vocab::AS       - [Activity Streams 2.0](https://www.w3.org/ns/activitystreams#) (W3C)
* RDF::Vocab::BF2       - [BIBFRAME 2.0](http://id.loc.gov/ontologies/bibframe) (LoC)
* RDF::Vocab::Bibframe  - [Bibliographic Framework Initiative](http://bibframe.org/vocab/) (LoC)
* RDF::Vocab::BIBO		- [Bibliographic Ontology](http://bibliontology.com)
* RDF::Vocab::CC        - [Creative Commons Vocabulary](http://creativecommons.org/ns#) (Creative Commons)
* RDF::Vocab::CERT      - [Cert Ontology](http://www.w3.org/ns/auth/cert#) (W3C)
* RDF::Vocab::CNT       - [Representing Content in RDF](http://www.w3.org/TR/Content-in-RDF10/) (W3C)
* RDF::Vocab::DataCite  - [DataCite Ontology](http://purl.org/spar/datacite/)
* RDF::Vocab::DBO        - [The DBpedia Ontology](http://dbpedia.org/ontology/)
* RDF::Vocab::DC        - [DCMI Metadata Terms](http://purl.org/dc/terms/) (DCMI)
* RDF::Vocab::DC11      - [Dublin Core Metadata Element Set](http://purl.org/dc/elements/1.1/) (DCMI)
* RDF::Vocab::DCAT      - [Data Catalog Vocabulary](http://www.w3.org/TR/vocab-dcat/) (DCMI)
* RDF::Vocab::DCMIType  - [DCMI Type Vocabulary](http://dublincore.org/documents/dcmi-terms/) (DCMI)
* RDF::Vocab::DISCO      - [DDI-RDF Discovery Vocabulary](http://rdf-vocabulary.ddialliance.org/discovery#) (DDI)
* RDF::Vocab::DOAP      - [Description of a Project (DOAP) vocabulary](https://github.com/edumbill/doap/wiki)
* RDF::Vocab::DWC       - [Darwin Core](http://rs.tdwg.org/dwc/terms/)
* RDF::Vocab::EARL      - [Evaluation and Report Language (EARL) 1.0 Schema](http://www.w3.org/ns/earl#) (W3C)
* RDF::Vocab::EBUCore   - [EBUCore](http://www.ebu.ch/metadata/ontologies/ebucore/ebucore#)
* RDF::Vocab::EDM       - [Europeana Data Model (EDM)](https://pro.europeana.eu/page/edm-documentation)
* RDF::Vocab::EXIF      - [Exif vocabulary workspace](http://www.w3.org/2003/12/exif/) (W3C)
* RDF::Vocab::Fcrepo4   - [Fedora Commons Repository 4 Ontology](http://fedora.info/definitions/v4/repository)
* RDF::Vocab::FOAF      - [Friend of a Friend (FOAF) vocabulary](http://xmlns.com/foaf/spec/)
* RDF::Vocab::GEO       - [GEO Vocabulary](http://www.w3.org/2003/01/geo/wgs84_pos#) (W3C)
* RDF::Vocab::GEOJSON   - [GEOJSON Vocabulary](https://purl.org/geojson/vocab#)
* RDF::Vocab::GEONAMES  - [GeoNames Ontology Vocabulary](http://www.geonames.org/ontology#)
* RDF::Vocab::GR        - [Good Relations](http://www.heppnetz.de/projects/goodrelations/)
* RDF::Vocab::GS1       - [GS1 Web Vocabulary for GS1 SmartSearch](http://gs1.org/voc/) (GS1)
* RDF::Vocab::HT        - [HTTP Vocabulary in RDF 1.0](http://www.w3.org/TR/HTTP-in-RDF10/) (W3C)
* RDF::Vocab::HYDRA     - [Hydra Core Vocabulary](http://www.w3.org/ns/hydra/core#) (W3C)
* RDF::Vocab::IANA     - [Link Relations](http://www.iana.org/assignments/relation/) (IANA)
* RDF::Vocab::ICAL      - [iCalendar vocabulary](http://www.w3.org/2002/12/cal/) (W3C)
* RDF::Vocab::Identifiers - [Standard Identifiers Scheme](http://id.loc.gov/vocabulary/identifiers.html) (LoC)
* RDF::Vocab::IIIF      - [International Image Interoperability Framework Presentation API](http://iiif.io/api/presentation/2.0/) (IIIF)
* RDF::Vocab::JSONLD    - [JSON-LD Vocabulary](http://www.w3.org/ns/json-ld)
* RDF::Vocab::LDP       - [Linked Data Platform](http://www.w3.org/TR/ldp/) (W3C)
* RDF::Vocab::LRMI      - [Learning Resources Metadata Initiative](http://dublincore.org/dcx/lrmi-terms/1.1/) (DCMI)
* RDF::Vocab::MA        - [Ontology for Media Resources](http://www.w3.org/TR/mediaont-10/) (W3C)
* RDF::Vocab::MADS      - [Metadata Authority Description Schema](http://www.loc.gov/standards/mads/) (LoC)
* RDF::Vocab::MARCRelators - [MARC Code List for Relators](http://id.loc.gov/vocabulary/relators.html) (LoC)
* RDF::Vocab::MO        - [Music Ontology](http://musicontology.com)
* RDF::Vocab::MODS      - [Metadata Object Description Schema](http://www.loc.gov/standards/mods/) (LoC)
* RDF::Vocab::NFO       - [NEPOMUK File Ontology](http://www.semanticdesktop.org/ontologies/2007/03/22/nfo#) (NFO)
* RDF::Vocab::OA        - [Open Annotation Data Model](http://www.w3.org/ns/oa) (W3C)
* RDF::Vocab::OG        - [Open Graph protocol](http://ogp.me)
* RDF::Vocab::OGC       - [Open Graph protocol classes](http://ogp.me)
* RDF::Vocab::ORE       - [Object Reuse and Exchange Ontology](http://www.openarchives.org/ore/1.0/rdfxml) (OAI)
* RDF::Vocab::ORG		    - [Organization Ontology](http://www.w3.org/TR/vocab-org/) (W3C)
* RDF::Vocab::PCDM      - [PCDM Ontology](http://pcdm.org/models#) (PCDM)
* RDF::Vocab::PPLAN		  - [P-Plan Ontology](http://www.opmw.org/model/p-plan/)
* RDF::Vocab::PREMIS    - [Preservation Metadata Implementation Strategies Ontology](http://id.loc.gov/ontologies/premis.html) (LoC)
* RDF::Vocab::PremisEventType - [PREMIS Event Type](http://id.loc.gov/vocabulary/preservation/eventType.html) (LoC)
* RDF::Vocab::PROV      - [Provenance Ontology](http://www.w3.org/TR/prov-o/) (W3C) 
* RDF::Vocab::PTR       - [Pointer Methods in RDF 1.0](https://www.w3.org/TR/Pointers-in-RDF10/) (W3C)
* RDF::Vocab::RDAU      - [RDA Vocabularies](http://www.rdaregistry.info/Elements/u/)
* RDF::Vocab::RightsStatements - [Rights Statements for Cultural Heritage Institutions](https://rightsstatements.org/en/)
* RDF::Vocab::RSA       - [The RSA Ontology](http://www.w3.org/ns/auth/rsa)
* RDF::Vocab::RSS       - [RDF Site Summary](http://web.resource.org/rss/1.0/)
* RDF::Vocab::SCHEMA    - [Schema.org](http://schema.org)
* RDF::Vocab::SD        - [SPARQL Service Description](https://www.w3.org/TR/sparql11-service-description/) (W3C)
* RDF::Vocab::SH        - [Shapes Constraint Language (SHACL)](https://www.w3.org/TR/shacl/) (W3C)
* RDF::Vocab::SIOC      - [Semantically-Interlinked Online Communities](http://rdfs.org/sioc/spec/)
* RDF::Vocab::SiocServices - [SIOC Services](http://rdfs.org/sioc/spec/) (SIOC)
* RDF::Vocab::SiocTypes - [SIOC Types Ontology](http://rdfs.org/sioc/spec/) (SIOC)
* RDF::Vocab::SKOS      - [Simple Knowledge Organization System](http://www.w3.org/TR/skos-reference/) (W3C)
* RDF::Vocab::SKOSXL    - [SKOS eXtension for Labels](http://www.w3.org/TR/skos-reference/skos-xl.html) (W3C)
* RDF::Vocab::V         - [RDF data vocabulary](http://www.data-vocabulary.org)
* RDF::Vocab::VMD       - [RDF data vocabulary](http://www.data-vocabulary.org)
* RDF::Vocab::VCARD     - [Ontology for vCards](http://www.w3.org/TR/vcard-rdf/) (W3C)
* RDF::Vocab::VMD       - [RDF data vocabulary](http://www.data-vocabulary.org)
* RDF::Vocab::VOID      - [Vocabulary of Interlinked Datasets](http://www.w3.org/TR/void/) (W3C)
* RDF::Vocab::VS        - [SemWeb Vocab Status ontology](http://www.w3.org/2003/06/sw-vocab-status/note.html) (W3C)
* RDF::Vocab::WDRS      - [Protocol for Web Description Resources](http://www.w3.org/TR/powder-primer/) (W3C)
* RDF::Vocab::WOT       - [Web of Trust](http://xmlns.com/wot/0.1/)
* RDF::Vocab::XKOS      - [XKOS An SKOS extension for representing statistical classifications](https://ddialliance.org/Specification/XKOS/1.2/OWL/xkos.html) (DDI)
* RDF::Vocab::XHTML     - [Extensible HyperText Markup Language](http://www.w3.org/1999/xhtml/) (W3C)
* RDF::Vocab::XHV       - [XHTML Vocabulary](http://www.w3.org/1999/xhtml/vocab) (W3C)

## Installation

Add to your Gemfile

    gem "rdf-vocab"

then

    bundle install

## Usage

    require "rdf/vocab"

This will load all the vocabulary classes in the library.

Also adds the `gen-vocab` command to the `rdf` command-line executable to generate specifically generated output in Turtle, JSON-LD, and HTML+RDFa for either built-in or arbitrary vocabularies. Other output serialization formats are also supported as generic RDF Writers and may lack the vocabulary-specific formatting of Turtle, JSON-LD, and HTML+RDFa.

## Adding new vocabularies

Vocabularies should only be added to this gem if they are widely used. An equivalent process can be used to add a vocabulary to an arbitrary Ruby application or gem if it is more application specific.

New vocabularies should be generated via a pull request after cloning from GitHub. Be sure to use a custom branch name before creating the PR.

* First, add an entry to `lib/rdf/vocab.rb`, the key is used to identify the vocabulary, and as the default basis for the prefix label to use for the vocabulary. The key names of the object value come from the following:
  <dl>
  <dt>uri (required)</dt>
  <dd>The namespace URI for the vocabulary.</dd>
  <dt>module_name (default RDF::Vocab)</dt>
  <dd>The Ruby module in which the vocabulary class is created.</dd>
  <dt>class_name (default from uppercase of the vocabulary identity)</dt>
  <dd>The class name of the vocabulary</dd>
  <dt>source (default from uri)</dt>
  <dd>The source used to fetch the RDF vocabulary definition (most formats supported). Defaults to the vocabulary uri.</dd>
  <dt>strict (default false)</dt>
  <dd>Creates a _strict_ vocabulary, so that attempts to use undefined terms in the vocabulary namespace become errors.</dd>
  <dt>alias (Internal only)</dt>
  <dd>Indicates that this is an alias for a vocabulary defined directly in the RDF namespace.</dd>
  <dt>skip</dt>
  <dd>Do not process this vocabulary, typically when the vocabulary source is inaccessible.</dd>
  <dt>patch</dt>
  <dd>The value is taken as a string formatted as an <a href="http://www.w3.org/TR/ldpatch/">LD Patch</a> used to correct issues in the vocabulary source that may show up when the vocabulary is validated.</dd>
  <dt>extra</dt>
  <dd>Value is a JSON Object which is added to the resulting vocabulary definition.</dd>
  </dl>

  For more information, see the documentation on
[RDF::Vocabulary](https://ruby-rdf.github.io/rdf/RDF/Vocabulary).
* Next, create an empty file in `lib/rdf/vocab` based on the key name for
your vocabulary. For example, if you've added the vocabulary `:foo`, create a
new empty file at `lib/rdf/vocab/foo.rb`.
* Create an entry in the README to document the availability of the library within this gem.
* Run `rake gen_vocabs`.

After the PR is merged, it will be available in the `develop` branch until the next library release.

### Example vocabulary definition

The following definition is for the EARL vocabulary, which uses the `patch` capability to address inherent problems in the vocabulary definition.

      earl: {
        uri: "http://www.w3.org/ns/earl#",
        source: "http://www.w3.org/ns/earl",
        patch: %{
          @prefix earl: <http://www.w3.org/ns/earl#>.
          @prefix owl: <http://www.w3.org/2002/07/owl#>.
          @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>.

          AddNew {
            # Extends EARL to talk about collections of assertions
            earl:Report a rdfs:Class, owl:Class ;
              rdfs:label "Report" ;
              rdfs:comment "A collection of earl:Assertion" .
            earl:assertion a owl:ObjectProperty, rdfs:Property ;
              rdfs:label "assertion" ;
              rdfs:comment "Test Assertions associated with an earl:Report or earl:TestCase" ;
              rdfs:domain [
                a owl:Class ;
                owl:unionOf (earl:Report earl:TestCase)
              ] ;
              rdfs:range earl:Assertion .
          } .
        }
      }

## Authors

* [David Chandek-Stark](https://github.com/dchandekstark)
* [Aaron Coburn](https://github.com/acoburn)
* [Michael J. Giarlo](https://github.com/mjgiarlo)
* [Gregg Kellogg](https://github.com/gkellogg)

## Contributing

This repository uses [Git Flow](https://github.com/nvie/gitflow) to mange development and release activity. All submissions _must_ be on a feature branch based on the _develop_ branch to ease staging and integration.

* Do your best to adhere to the existing coding conventions and idioms.
* Don't use hard tabs, and don't leave trailing whitespace on any line.
  Before committing, run `git diff --check` to make sure of this.
* Do document every method you add using [YARD][] annotations. Read the
  [tutorial][YARD-GS] or just look at the existing code for examples.
* Don't touch the `.gemspec` or `VERSION` files. If you need to change them,
  do so on your private branch only.
* Do note that in order for us to merge any non-trivial changes (as a rule
  of thumb, additions larger than about 15 lines of code), we need an
  explicit [public domain dedication][PDD] on record from you,
  which you will be asked to agree to on the first commit to a repo within the organization.
  Note that the agreement applies to all repos in the [Ruby RDF](https://github.com/ruby-rdf/) organization.

## License

This is free and unencumbered public domain software. For more information,
see <https://unlicense.org/> or the accompanying {file:LICENSE} file.

[RDF]:              https://www.w3.org/RDF/
[RDF.rb]:           https://ruby-rdf.github.io/rdf
[YARD]:             https://yardoc.org/
[YARD-GS]:          https://rubydoc.info/docs/yard/file/docs/GettingStarted.md
[PDD]:              https://unlicense.org/#unlicensing-contributions
[LD Patch]:       http://www.w3.org/TR/ldpatch/