[Simple] XML schema for presence rules documents

Hello,

I have a question regarding the XML Schema that validates the presence 
rules documents, schema
defined in Section 6 of draft-ietf-simple-presence-rules-09

Because XML Schema allows any global element to be a document root 
element for a document that can be valid against the schema, it results 
that documents like:

<?xml version="1.0" encoding="UTF-8"?>
<provide-place-is 
xmlns="urn:ietf:params:xml:ns:pres-rules">true</provide-place-is>

are valid, though meaningless in regards to a complete presence rules 
document containing conditions, actions and transformations sections.

I could:

1. Validate the document against both presence rules and common policy 
schemas, but that's inefficient.
2. Validate the document against the presence rules schema and then 
check its root element is a "ruleset" one.

Is there something that I miss here ?

Thank you.

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