[shepherd] XML tests

Some of our tests are not XHTML, so running validation on them doesn't make
much sense. Generally these are the ones in the 'other-formats' folder.
They should be considered tests, but we can't automatically process them
the way we do other tests.

Ex: http://test.csswg.org/shepherd/testcase/background-18/

Not sure how to handle these, but the system shouldn't be marking them
invalid for missing XHTML bits...

~fantasai

Received on Wednesday, 12 October 2011 20:56:03 UTC