>
> Basically, I would like to develop schemas that impose
> constraints on an element or attribute in one XML file based on
> element or attribute values from another XML file. Is this at
> all possible? I would consider making a file containing just a
> list of all available item IDs, if that would help solve the
> problem.
This can't be done directly: schema validation is confined to a single
document. The only thing you can do is write a transformation that
constructs a synthetic document and validate that; but then you might as
well do the validation within the stylesheet that performs the
transformation.
Michael Kay
http://www.saxonica.com/
