XSD version question

Hello folks,

I am in a quandary.  I am trying to to see how to refer to the value of the version attribute in an XSD in an XML instance.

<schema xmlns="http://www.w3.org/1999/XMLSchema <http://www.w3.org/1999/XMLSchema>"
               targetNamespace="urn:person-schema” version=“5">
    ...
</schema>
The instance can have:

          xmlns:xsi="http://www.w3.org/1999/XMLSchema/instance <http://www.w3.org/1999/XMLSchema/instance>"
          xsi:schemaLocation="urn:person-schema
                              urn:person-schema/person-schema.xsd"

How is the version attribute from the XSD to be carried to the XML instance?  I cannot find anything out there.
Why don’t we have xsi:schemaVersion?
Thanks,
Loren