Jonathan Robie is the XML Product Architect at DataDirect technologies. He is also a co-inventor of XQuery, the W3C XML Query language, and is now an editor of many of the specifications which define the XQuery language. He is also a co-inventor of XQL, an earlier XML query language which was a predecessor of XPath. Jonathan has had significantly involved in several other W3C Working Groups, acting as an editor for documents produced by the XML Schema and Document Object Model Working Groups, and has also participated in the W3C XML Information Set and XML Stylesheet Language (XSL) Working Groups. He is well known in the XML world, both as an innovator and as a speaker.Prior to joining DataDirect, Jonathan worked as an XML ResearchSpecialist at Software AG, where he helped design architectures forXML servers and represented Software AG on the XML Query and XML Schema Working Groups. He has been on the architecture team for three XML databases or repositories, at Software AG, Texcel Research, and POET Software. He has a total of 13 years experience with advanced database systems and complex database applications, especially object oriented databases, multimedia databases, workgroup database applications, and XML/SGML databases.