[osis-core] osisWork regex in XMetaL

[Harry Plantinga]

As near as we can figure, there is something wrong
with XMetaL which prevents it from accepting much of
anything for an osisWork using the given regex. In 
particular, Todd's valid document doesn't validate
in XMetaL, which claims that the osisWork doesn't
match the regex.

I guess we'll have to hack our copy of the schema
to try to come up with a regex that works with XMetaL.

-Harry