xml2rfc xxe (XML Editor) plugin
xml2rfc validator (checks XML well-formedness, validity, and usability for xml2rfc)
Bill's custom xml2rfc-style references for I-Ds and RFCs
Format your xml2rfc-format draft with the above references
a perl program to extract ABNF from I-Ds and RFCs
Research for moving rfc2234 to Draft