When the id() function is used in a pattern, with an
argument comprising a space-separated list of ID
values, none of the values is matched.
For example, match="id('a b c')" should match the three
elements with ID values "a", "b", and "c", but it
actually matches none of them.
Applies to 6.5.2, 7.4, and all other Saxon releases.
Test case idky137