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The Schema Component Constraints "Selector Value OK" and "Fields Value OK" specify that whitespace is allowed as part of the xpath expressions. This seems to be the result of bug 2051. The pattern restriction in the schema for schemas, on the other hand, was not changed, so it still forbids whitespace.
I just found out that this issue was already mentioned in bug 2229 item 3. That bug was marked RESOLVED FIXED without this particular issue being fixed.
Again I've been too quick to commit here. Now I noticed the blocks of that bug report, and realized that this here is a dup of bug 2207. Sorry for the spam! *** This bug has been marked as a duplicate of bug 2207 ***