operator is useful if you write a function that can accept arguments of
several different types and you want to test which type you have been given
(just like "instanceof" in Java). The "castable as" operator is useful when
you are given untyped data and you want to see whether its lexical form
makes it suitable for casting to a particular type such as xs:integer or
xs:date - which is where this thread started.
strike last email...oxygen had a cached result (pasted the correct
result in last email)...understand now that there is enough for me to use.
--Jim Fuller
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