RE: [DR008] - passing arbitrary content

I think that Henrik may have meant Base64 encoding when he said "hex."
Base64 is a supported type within XML Schemas.  The main point is that it is
easily possible to carry small amounts of binary data inline in XML.

Regarding referencing data using a URI, the URI does not need to reference
remote data.  It can reference another part within a multipart-MIME package.
See 

[1]
http://discuss.develop.com/archives/wa.exe?A2=ind0010&L=soap&F=&S=&P=25122
[2]
http://www.hpl.hp.com/personal/John_Barton/HTTP-A/SOAPAttachments16OCT00.htm