According to the March DTD  REV and REL are NAME attributes:
<!ENTITY % linkType "NAME"
rel %linkType #IMPLIED -- forward relationship type --
rev %linkType #IMPLIED -- reversed relationship type
So how they are treated with respect to case is determined by
the HTML SGML Declaration. The SGML Declaration says:
NAMECASE GENERAL YES
which means that in the HTML DTD, upper case versions of letters are
converted to their lower case version before processing.
> I would assume case would be preserved for that... is this
The TITLE attribute is CDATA. Case is preserved in CDATA attributes.
On a related note, there are lots of people on the Web with questions like
this that do not konw how to read a DTD. Is there an introductionry