Updated Metadata Issue #1: Add $t Tag

["Drummond Reed" <drummond.reed@cordance.net>]

Metadata Issue #1: Add $t Tag for Identifier Types has been updated on the
wiki at:

http://wiki.oasis-open.org/xri/Xri2Cd02/MetaData/I1IdentifierTypeSection

More requirements have been added, and the proposal section has been updated
to a formal proposal to add a $t (identifier type) namespace to the Metadata
specification.

Please read and comment on the requirements and proposal. Since under this
proposal this issue now "wraps" all the others for the Metadata
specification, it is the only outstanding issue for this spec and thus we
plan to discuss it on this Thursday's/Friday's TC call.

=Drummond