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Subject: RE: [xacml] is-present-designators (fwd)
I agree. They are not critical and the functionality can be temporarily added as an extension function if some policy really needs it. -----Original Message----- From: simon godik [mailto:simon@godik.com] Sent: Tuesday, November 05, 2002 2:49 PM To: XACML Subject: Re: [xacml] is-present-designators (fwd) There is potential optimization with is-present elements, provided that attribute data storage supports is-present query. I propose to defer this optimization to xacml 1.1. Simon ----- Original Message ----- From: "Polar Humenn" <polar@syr.edu> To: "XACML" <xacml@lists.oasis-open.org> Sent: Tuesday, November 05, 2002 2:46 PM Subject: Re: [xacml] is-present-designators (fwd) > > On Tue, 5 Nov 2002, Polar Humenn wrote: > > > There is a way to test if attribute is present without using is-present-designator elements: > > It is to compare bag size selected by the designator to 0: > > > > <apply function-id="integer-greater-than"> > > <apply function-id="type-bag-size"> > > <attribute-designator ..../> > > </apply> > > <attr-val ...>0</attr-val> > > </apply> > > Well, I do agree that is a way, but still it may not be all that > efficient. > > Let's say you have an attribute named "face-print" that contains 2MB of > image data. You might have 10 of them. If you just want to know if its > present, using the IsPresent element just may require the request context > builder to just see if its there. The comparing the bag size would require > the AttributeDesignator, which would actually retrieve them for nothing. > > -Polar > > > > > > > > > My proposal is to drop is-present-attribute-designators > > > > Simon > > > > > > > ---------------------------------------------------------------- > To subscribe or unsubscribe from this elist use the subscription > manager: <http://lists.oasis-open.org/ob/adm.pl> > > > ---------------------------------------------------------------- To subscribe or unsubscribe from this elist use the subscription manager: <http://lists.oasis-open.org/ob/adm.pl>
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