[xacml-comment] About subject category attributes

Section 6.2. says that:
No more than one <Subject> element may contain an <Attribute> with the
given value for
AttributeId $B!H(Burn:oasis:names:tc:xacml:1.0:subject:subject-category$B!I(B.

What does this mean?

How is this related to the following description in Section 5.30???

If there are multiple subjects with the same subject category attribute,
then they SHALL be treated as if they were one categorized subject.

Satoshi Hada
IBM Tokyo Research Laboratory
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