Extend Open Document Specification to improve support for bibliographies.

Create a new schema definition that defines bibliography content separately from text content. The top-level XML element for bibliography content will be <office:bibliography>. <office:bibliography> will be a child element of <office:body>. Create a corresponding ODF document-type and a corresponding ODF namespace for bibliography content. All bibliography information will be stored in <bibliography:data>. <bibliography:data> will be a required child element of <office:bibliography>. Further articulation of the <office:bibliography> schema will be decided in further discussions.