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Subject: Re: [xacml] [CR] DataType attribute required?
Taking this approach to the extreme, means you really need a typechecking compiler that not only "checks" the type correctness of the policy, but to WILL HAVE TO "infer" the types of the elements, which is a little bit of a harder problem. However, in this simple type system (i.e. no recursive, abstract types), it's not much harder. So, if you go that far, you might as well eliminate DataType attribute altogether from the schema, as it doesn't buy you anything but possible confusion. As as Michiharu says "In most cases...". However, I would say "In all cases...." since we can see every expression only appears in a Target or Condition. The top level expressions in a Target or a Condition in XACML must result in xs:boolean, and as Michiharu states, the types of all elements in the expression can be "inferred" from the functions applied to them. I would propose to remove the DataType attribute, in this case. Cheers, -Polar On Thu, 29 Aug 2002, Michiharu Kudoh wrote: > DataType attribute in AttributeDesignatorType is 'required'. But in most > cases, AttributeDesignator is used below the matching function (e.g. > string-match) and that function is type-specific. So I think "DataType" > attribute is not required. I propose to change it to "optional". > > <xs:complexType name="AttributeDesignatorType"> > <xs:attribute name="AttributeId" type="xs:anyURI" use="required"/> > <xs:attribute name="DataType" type="xs:anyURI" use="required"/> > <xs:attribute name="Issuer" type="xs:anyURI" use="optional"/> > </xs:complexType> > > [should be] > <xs:complexType name="AttributeDesignatorType"> > <xs:attribute name="AttributeId" type="xs:anyURI" use="required"/> > <xs:attribute name="DataType" type="xs:anyURI" use="optional"/> > <xs:attribute name="Issuer" type="xs:anyURI" use="optional"/> > </xs:complexType> > > Michiharu > > IBM Tokyo Research Laboratory, Internet Technology > Tel. +81 (46) 215-4642 Fax +81 (46) 273-7428 > > > > > > ---------------------------------------------------------------- > To subscribe or unsubscribe from this elist use the subscription > manager: <http://lists.oasis-open.org/ob/adm.pl> >
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