In the "Compounding Semantics" department, here is a simple scheme to convolute [XHTML 1.0 with MathML 2.0] or [XHTML 1.0 with MODS 3.3], that is commentaries on Math or Bibliographic References (Meta Data).
The basic idea is that one could use Open Office to generate a XHTML wrapper, and use either OpenOffice Formula (MML) or Zotero (MODS) as a "foreign namespace" editor.
http://www.rustprivacy.org/FunForLibrarians.pdf (file names case sensitive)
http://www.rustprivacy.org/compound_docs.zipAny comments are welcome.
--Gannon (J.) Dick