[xacml-comment] There is no Section describing<SubjectAttributeDesignator>

Hi,

There is no section describing <SubjectAttributeDesignator>.
As a result, although the term "present" is defined for other attribute
designators (action, resource, environment),
there is no definition of "present" for subject attribute designator.
Is this okay?

Satoshi Hada
IBM Tokyo Research Laboratory
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