How to clarify the error message? What about (borrowing
language from the above paragraph):
"Invalid initial / or // in path step: Cannot select the root
node of the tree that contains the context node, because the
context item is not a node."
It's a little long, but given that I'm not the first one who
has been unhelped by the existing error message, wouldn't it
be worth it to make this somewhat obscure problem clearer?
I'll see what I can do to improve it.
One of the difficulties in designing run-time error messages is that it's
dangerous to make assumptions about what constructs were used in the
original source code, since the same run-time code can be produced from many
different source code formulations. However, there are many cases where
Saxon saves information at compile time for use in the event of a run-time
error, so that better diagnostics can be produced, and it might be possible
to do the same here.
Michael Kay
http://www.saxonica.com/
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