[tei-council] Simple problems (3)

I see that there is a schematron rule to ensure that anything pointed to by means of a @corresp attribute is actually there, i.e. a test that for each @corresp="#foo" there is somewhere an @xml:id="foo" This seems admirable, but why is it only applicable to @corresp? Surely it is equally important for (at least) the other members of att.pointing.global which Simple includes, i.e. @next, @prev, and @ana ? Sauce goose gander, shirley?