[xml] occurrences on elements & sequences

I've come across a couple of bugs in schema handling, specifically
dealing with min & max occurrences on elements and sequences.
If an element has a minOccur='0' and maxOccur > 1 and the element is not
present in the xml file being validated, then the validation fails. See
attached elem.* files for test case. Also minOccur and maxOccur on
sequence are not handled at all.
I (hopefully) fixed the problems in xmlSchemaBuildAContentModel with the
attached patch, but I don't really understand the automata routines so
the patch needs checking. The patch also adds a check for unbounded case
when building a model for choice types.

Charlie B.

Attachment: elem.xsd
Description: Text document

Attachment: elem.xml
Description: Text Data

Attachment: seq.xsd
Description: Text document

Attachment: seq.xml
Description: Text Data

Attachment: xmlschemas.pat
Description: Text document

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