Jeni is an independent consultant specialising in XML, XSLT, schemas and the semantic web. She was one of the founders of the EXSLT initiative, has authored several books on XSLT and was an invited expert on the XSL Working Group during the design of XSLT 2.0. She is an invited expert on the XML Processing Working Group and the main developer of DTLL, the datatype library language, which is part of DSDL. She also has an interest in overlapping markup, and is one of the developers of LMNL and of Creole, a schema language for overlapping structures. She lives in London with her de facto and two young children.