Saxon XSLT and XQuery Processor

When a source document is supplied using a
TransformerHandler, no document number is allocated;
this results in the generate-id() function returning
illegal id's such as d-1e101. The XSLT specification
states that the id must be alphanumeric.

I'm not aware of any other adverse side-effects of
having a default document number of -1, but they may
exist.

Reported by Thomas Masing (Thomas.Masing@bgs-ag.de)

Present since Saxon 6.4.