This document defines the 'XML2RFC' vocabulary; an XML-based (Extensible Markup Language) language used for writing Internet Drafts and RFCs. Editorial Note (To be removed by RFC Editor) Discussion of this draft takes place on the XML2RFC mailing list (xml2rfc@ietf.org), which has its home page at <https://www.ietf.org/mailman/listinfo/xml2rfc>.