Re: [xsl] error in xsl:key

[David Carlisle <davidc@xxxxxxxxx>]

> E.g. in Saxon 9.1 this results in error when I try to access a key() 
> function,
> with valid $key-value.

when making the key the use attribute (conceptually) has to be evaluated
on every node that matches the match attribute, so you know which nodes
are indexed by which key values. If evaluating teh use attribute can
generate an error then you shoud lexpect an error when teh key is made,
which in practice is probably the first time you use the key() function.
the arggument of the function are not really relevant as once the system
decides it needs to build the key it needs to index the whole document.

Since it's an extension function you should be able to arrange that it
never errors and instead always returns a value, even if it's a special
value such as "**error**"

David

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