Need a link to UBL TC page and UBL 2.0 specifications.

[Tim McGrath <tim.mcgrath@documentengineeringservices.com>]

As one of the purposes of ubl.xml.org is to be a portal for all things 
UBL, i think we need a link to the UBL specification itself and possibly 
also the OASIS UBL TC page (as well).

i think we might need another top-level menu item (after FORUMS) that 
just says UBL (or something).  The other possibility is we call it a 
RESOURCE??

any other ideas?
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