FWIW:
It might be useful for this document to be more clear in showing
a) the specific header it introduces, before it talks about variations
(e.g. in Sec 2 when it is introduced, rather than in subsections)
b) examples of that header in the context they would appear in a typical
packet, clearly
A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Internet Area Working Group of the IETF.
Title : Generic UDP Encapsulation
Authors : Tom Herbert
Lucy Yong