Up until a couple drafts ago, the syntax of try/catch was different,
and the various $err:* variables were not auto-declared:
http://www.w3.org/TR/2009/WD-xquery-11-20091215/#id-try-catch
Perhaps that's the version of try/catch that the processor supports.
There's a note in the source code that the catch variables are not yet
supported - I think they were omitted because the spec was in flux at
the time, and failure to implement them in 9.4 was an oversight (aided
and abetted by the absence of any tests in the test suite).
Michael Kay
Saxonica
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