And what if the notation in the XML/SGML document I've got on my computer
references a proprietary standard or viewer that I don't have? Same
useless data problem I had before...
Maybe genuinely extensible viewing _software_ will get us past this
thicket, but I don't think notations have any inherent advantages over MIME
types beyond their being a superset, allowing them to reference even more
lose-able resources.
Simon St.Laurent
XML: A Primer / Cookies
Sharing Bandwidth (December)
Building XML Applications (January)
http://www.simonstl.com