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About is a collaborative, community activity with a mission to create, maintain, and promote schemas for structured data on the Internet. In addition to people from the founding companies (Google, Microsoft, Yahoo and Yandex), there is substantial participation by the larger Web community, through public mailing lists such as and through GitHub. See the releases page for more details, and the FAQ for supporting information.

Since April 2015, the W3C Community Group is the main forum for schema collaboration, and provides the mailing list for discussions. issues are tracked on GitHub.

The day to day operations of, including decisions regarding the schema, are handled by a steering group, which includes representatives of the founding companies, a representative of the W3C and a small number of individuals who have contributed substantially to Discussions of the steering group are public.

The People

A number of people have made substantial contributions to over the years. These include:

Community Group and Steering Group is organized via two groups: a small Steering Group responsible for high level oversight of the project (including approval of new releases), and a larger Community Group which handles the day to day activity of schema evolution, discussion and integration.'s Community Group prepares releases for the approval of the Steering Group. A project webmaster (currently Dan Brickley) assists the steering group with the implementation of this process. See how we work for more details on this workflow.

The Steering Group is chaired by R.V. Guha, who serves in an individual capacity. The regular Steering Group participants from the search engines are Peter Mika from Yahoo; Alex Shubin, Yuliya Tikhokhod and Charles Nevile from Yandex; Shankar Natarajan, Tom Marsh and Steve Macbeth from Microsoft; and Vicki Tardif Holand and Dan Brickley from Google. In April 2015 the Steering Group unanimously agreed to expand its membership to include St├ęphane Corlosquet and Martin Hepp, and to offer a seat to a representative from W3C. The Steering Group has a mailing list - mostly used for scheduling periodic phone/skype/etc calls, whose notes are posted to public GitHub and linked from issue #1 in the project's issue tracker.

The Community Group is chaired by Dan Brickley, who acts in this capacity on behalf of the project rather than his employer, Google. It is open to any interested parties who have agreed to the W3C Community Contributor License Agreement. The role of the Community Group is to propose, discuss, prepare and review changes to, for final review and publication by the Steering Group. The Community Group also serves as a hub for discussion with other related communities, at W3C and elsewhere. The GitHub repository is considered a tool of the Community Group, and is currently the main focus for community discussion.

In other words, the W3C Community Group is the main forum for the project - It is Github-based in the sense that its GitHub repository - ...

Note also that other W3C Community Groups exist that are focused partially or entirely on improvements, e.g. health and medicine, sports, archives, libraries and bibliography, autos... ...these groups have their own ways of working, and coordinate via the main Community Group and its Github repository.