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> Not entirely sure whether recursive apply is the central problem: One
> might be able to infer what type of the input is from the type of the
> <xsl:template match="..."> and the input schema.
The only cases where the match pattern enables one to do any static type
inference is when the match is specifically against a schema type, for
In the much more common case where elements are matched by name, for example
no formal inferencing is possible, because this will match any element
called my:invoice whether it conforms to a schema definition of that name or
not. However, it is possible in this case to do some tentative inferencing,
and generate warning messages of the form "if the input is a valid invoice,
this template will produce no output".