METS folks -- over here in MODS land we're trying to get version 3.0 ready
and we have an issue with xlink. The current mods version uses the mets
xlink schema, and we want to continue to use it. But we've gotten pressure
from our users to change the namespace id to the "standard" form,
i.e."http://www.w3.org/1999/xlink" rather than "http://www.w3.org/TR/xlink".
As a temporary solution I copied the mets xlink schema to the mods directory
and changed (in the mods version -- haven't touched the mets version) the
namespace id to the standard form, and correspondingly changed the namespace
id in mods. That's the only way it will validate, short of changing the mets
xlink schema (which of course I don't have the authority to do), and if the
mets xlink schema is so changed, the mets schema itself would have to be
changed too or it would no longer validate.
Whether or not METS wants to make the change, I don't know. But if you
do(before version mods 3 is ready, which should be soon, a week or so),
we'll change this all back and reference the mets xlink schema.