Proposed schema addition: attribute scope

Per the con call, I'll propose an addition to the AttributeValueType in
the assertion schema (16 draft) to carry attribute scope information
explicitly:

<complexType name="AttributeValueType">
  <sequence>
  <any namespace="##any" processContents="lax" minOccurs="0"
maxOccurs="unbounded" /> 
  </sequence>
  <attribute name="Scope" type="string" use="optional" />
</complexType>

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