Public identifier for XSLT

I'm testing a CMS and one of its requirements for an XSLT to be defined as an
XSLT, is a public identifier.  I looked at the schema-for-xslt20.xsd and can't
see one there. Is there one? If so what is it. And if so it should be for XSLT
2.0.

Thanks

Marijan (Mario) Madunic
Publishing Specialist
New Flyer Industries


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