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" <>
To: "XACML" <>
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
> >
> >
>
>
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