Extreme is the Markup Theory & Practice conference. That means that a wide variety of subject matter is appropriate and welcome. Here is a list or possible topics for Extreme, intended to suggest and inspire, but not to limit:

• XQuery, XSL-FO, XSLT, SVG, Pipelining, Topic Maps, RDF, TMQL,DSDL, OWL, SGML, XML, XSD, RELAX NG ...
• markup for document production
• markup for preservation and reuse of cultural artifacts
• issues in the design and deployment of markup vocabularies
• engineering tradeoffs in the design of markup-driven systems
• overlapping structures and how to represent them
• bias, objectivity, neutrality and ontological commitment in markup, markup design and software tools
• trees, tuples, sequences, directed graphs, and other data structures for the representation of information
• better markup as a tool for making the Web more useful
• the future of multi-purpose content
• the future of structured documents
• designing, creating, using, mainipulating, and interpreting marked-up content
• new markup-related tools
• markup semantics
• new approaches to old problems and new
• things you can and can't do with XML
• things it never occurred to you that anyone would want to do with XML
• alternatives to popular specifications and techniques
• treating non-XML data as if it were XML
• treating XML data as if it were non-XML
• implementation reports: love songs or horror stories

For more details see the Instructions for Authors