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Subject: [xacml] [Text change] "notional" Request Context


Colleagues,
I find the concept of the Request Context being a "notional" document
has been lost once again in the most recent revisions.

I know we want to avoid specifying implementation details, but this
concept has been VERY unclear to implementors :-).  With the current
text, I can guarantee that we WILL NOT get implementations that meet
our intent.

I propose the following changes to make our intent clear:

1. Glossary, "Context handler": add

   The context handler is also responsible for retrieving attribute
   values as needed when the PDP evaluates attribute designators or attribute
   selectors.

2. Section 7.9 Attributes: in the paragraph describing attribute
   retrieval, change the first sentence from:

   "The PDP SHALL retrieve the values of attributes from the request
   context that match the attribute designator or attribute selector
   in the policy and form them into a bag of values with the
   specified DataType attribute."

   to:

   "The PDP shall request the values of attributes in the request
   context from the context handler.  The PDP references the
   attributes as if they were in a physical request context document,
   but the context handler is responsible for obtaining and supplying the
   requested values.  The context handler SHALL return the values
   of attributes that match the attribute designator or attribute
   selector and form them into a bag of values with the specified
   DataType attribute.
   
Anne
------
Anne Anderson          Anne.Anderson@Sun.COM
Sun Microsystems Laboratories
Burlington, MA         781-442-0928



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