Rewriting the regexp for @ContentType in opc-contentTypes.xsd

[MURATA Makoto]

Folks,

I have thoroughly rewritten the regular expression.  it
does not look like a regular expression but looks like a
grammar.  This is because I heavily used parsed entities
such as token, qdtext, and quoted-pair.

Attached please find the schema, and three test files.

I have not finished the RELAX NG schema.  It requires
manual conversion....

Regards,
Makoto
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