Title: RE: [xacml] request and response context schema
Hi Carlisle,
1) In AttributeDesignator, should Issuer be a string or an anyURI?
You currently have it as an anyURI but I wonder if string would be a better
choice (note that it is a string in the SAML Assertion).
Issuer can be a string, although I prefer
uri.
2) In ResourceSpecifier,
I would suggest changing "ResourceURI" to something like "ResourceLocator",
since this more clearly says what it is for. Also, I would add another
attribute called "ResourceName" (of type anyURI).
Could you please explain more what ResourceLocator
will be used for?
3) It is not clear to me why DecisionType has been defined. It
seems to me that in many cases it will not give sufficient information (in
particular, "Permit Read FileX" is not an appropriate answer if the question is
"can Joe Read FileX?").
Do you think 'subject' should be included as well
in 'decision-type'? I was thinking that subject could be matched
from the input context, but it also could be
included in the output context.
4) If DecisionType is kept, Action should be of type string (not anyURI),
and I would recommend adding the element AbstractPrincipal (to address my
concern in (3)). All three pieces of information (i.e., ResourceName,
Action, and AbstractPrincipal) should be optional.
I agree that we could extend decision-type with
principal information (see above).
Why do you think action should be made into a
string? If it is a string we need additional attributes on the
<action>
element to classify it.
Simon
