Still ignoring schema.
My supposition is that *for the xml instance being processed*
either the expression will or will not return a non-empty
sequence. Hence there is a possible error.
In this case either the first book child has an author child or not.
Surely that information is available Mike?
The problem is that if someone writes
if (@version = "2.0") ...
and there is no @version attribute, it's very likely that the semantics
of the vocabulary are that an absent version attribute is to be treated
as if @version="1.0". So a warning that there is no version attribute
would be inappropriate here. The situation where the schema doesn't
allow a version attribute is different.
Michael Kay
Saxonica
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