Extreme is a technical conference devoted to markup, markup languages, markup systems, markup applications, and software for manipulating and exploiting markup. Papers at Extreme this year discuss: Topic Maps; Overlap; Querying XML; RDF; XSLT; quality assurance, error correction, and error prevention in XML documents; Ontologies; XML software; and case studies from government, industry, and academia. Gilbane Report Subscribers get $100. discount! Enter “Gilbane” in the “Coupon Code” box on the registration form. , www.extrememarkup.com