The XML Schema Working Group, part of the XML Activity, is responsible for the W3C's work on this topic -- for details see the Working Group's charter.
W3C Members can also participate in the W3C XML Schema Interest Group, a forum for the discussion of technical issues relating to the development of XML Schema.
There is also a Test Collection aimed at determining which parts of XSD 1.1 have been implemented; several implementations are under development.
If you find errors in Schema 1.1, please let us know.
Tools · Usage · Resources · Specifications and Development XML Schemas express shared vocabularies and allow machines to carry out rules made by people.