Vocabularies

Dublin Core

See http://dublincore.org/. Namespaces are at http://purl.org/dc/elements/1.1/ for the 15 major elements, and a more elaborate term vocabulary is at http://purl.org/dc/terms/.

FOAF

The Friend-of-a-Friend vocabulary, for describing social networks. See http://xmlns.com/foaf/0.1/ for the namespace, and http://rdfweb.org/ for more information.

RSS

Of the plethora of RSS specifications, RSS 1.0 (http://purl.org/rss/1.0/) is an RDF vocabulary.

Geospatial vocabularies

For points only, there is http://www.w3.org/2003/01/geo/wgs84_pos#. A more sophisticated treatment of geography following the OGC Well-known text descriptors is contained in 3 OWL ontologies referenced at http://www.mindswap.org/2004/geo/geoOntologies.shtml.

SKOS

The Simple Knowledge Organization Scheme (http://www.w3.org/2004/02/skos/core/) describes thesauri and controlled vocabularies.

Creative Commons

A vocabulary for open copyright licenses, at http://web.resource.org/cc/.

SWED

Semantic Web Environmental Directory — this was a UK project producing a number of tools and ontologies, in particular see http://www.swed.org.uk/swed/swed_technical_resources.htm

Toolsets

Swoogle

This is a search engine for Semantic Web resources, from UMBC and at http://swoogle.umbc.edu/.

SWOOP

A lightweight OWL editor, from the UMD Mindswap lab, at http://www.mindswap.org/2004/SWOOP/.

RDF toolkits

A comprehensive list of RDF programmatic toolkits, covering over a dozen different languages, is at http://www.wiwiss.fu-berlin.de/suhl/bizer/toolkits.

D2RQ

This is an declarative vocabulary and Java toolkit for mapping between relational databases and RDFS or OWL schemas, at http://www.wiwiss.fu-berlin.de/suhl/bizer/d2rq/.

Scout Portal Toolkit/CWIS

This is a web application that easily allows you to set up a Dublin Core-based catalog of resources, at http://scout.wisc.edu/Projects/CWIS/.

SIMILE and Longwell

SIMILE (http://simile.mit.edu/)is a project out of MIT that is building ties between digital libraries and the Semantic Web. Of special note is the Longwell RDF browser, which is a catalog browser using facets to navigate.

SPARQL

This is a RDF query language, a bit like SQL, that is becoming popular. The specification is at http://www.w3.org/TR/rdf-sparql-query/.

Other resources

Thesauri and the Semantic Web

See A Quick Guide to Publishing a Thesaurus on the Semantic Web, at http://www.w3.org/2004/03/thes-tf/primer/.

Semantic Web Reference Card

At http://ebiquity.umbc.edu/v2.1/resource/html/id/94/.

Directory of Semantic Web schemas

See SchemaWeb at http://www.schemaweb.info/.

Resources on RDF

Dave Beckett maintains a comprehensive list of RDF resources at http://www.ilrt.bris.ac.uk/discovery/rdf/resources/.

Developer weblogs

The site Planet RDF (http://planetrdf.com/) gives newsfeeds from the weblogs of a number of Semantic Web developers.

Semantic Web Interest Group

This group's IRC chats are summarized at http://rdfig.xmlhack.com/.