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Web Schemas


This is the main Wiki page for W3C's Semantic Web Interest Group Web Schemas task force. Amongst other roles, it serves as a public discussion forum for, including Extension proposals.

The taskforce chairs are R.V.Guha (Google) and Dan Brickley (Vrije Universiteit Amsterdam and Google)

In scope include collaborations on mappings, tools, extensibility and cross-syntax interoperability. An HTML Data group is nearby (see also public-html-data-tf list); detailed discussion about Web data syntax belongs there.

See the charter for more details.

The group uses the mailing list

  • See archives
  • Issue Tracker (organized into "Feedback on X" products/categories, where Xs are Schemas we're discussing)
  • To subscribe, send a message to with Subject: subscribe (see for more details).
  • If you are new to the W3C community, you will need to go through the archive approval process before your posts show up in the archives.
  • To edit this wiki, you'll need a W3C account; these are available to all
  • To search just this WebSchemas wiki, the issue tracker and mailing lists, try a a custom search.

Groups who maintain Web Schemas are welcome to use this forum as a feedback channel, in additional to whatever independent mechanisms they also offer.

In particular, the initiative has adopted this group as its primary public feedback forum. Others are invited to do likewise.

Any W3C-related questions, ask Dan Brickley (SWIG chair), c/o

Discussion Elsewhere

For background discussion on this group, and W3C's SWIG, the Oct 2011 Semantic Link podcast may be of interest.

The Dublin Core Metadata Initiative has a related task group working on Alignment, alongside existing vocabulary collaboration work with FOAF.

For there are discussions on various sites (unofficial; this group is the only place monitored by team) :

Proposals from and for

The main table for managing/tracking proposals is maintained here: Proposals

A separate entry discussed Process as it relates to this group.

Possible future discussions for extensions (proposals welcomed; this list is free-form...):

Tools and Statistics


Mappings between various vocabularies of interest on the Web Schemas list. The following are mostly using as a hub, but others would be great to collect too.

Markup examples

This group is about vocabulary (schemas) rather than specific markup syntax details. However since syntax specs are evolving in parallel, there are often discussions that need to mix syntax and vocabulary issues.

  • from, some examples showing RDFa 1.1 lite versions of's Microdata samples example sites - the following list give concrete examples of sites (testable with Google richsnippets tool):