Is Schematron (using XPath 2.0) functionally a superset of XML Schemas?

["Costello, Roger L." <costello@mitre.org>]

Hi Folks,

Is Schematron (using XPath 2.0) functionally a superset of XML Schemas?

Using XPath 2.0, Schematron can now perform all of the grammar-type
checks that XML Schemas does, e.g. check that the correct tags are
being used, the tags are arranged properly, and the datatypes of each
element and attribute are correct. 

Plus Schematron can perform co-constraint checks, cardinality checks,
and algorithmic checks that XML Schemas cannot do.

Are there things that XML Schemas can do that Schematron (using Xpath
2.0) cannot do?

/Roger