Re: [xacml] Change request: separating round, abs,floor and other function.

[Polar Humenn <polar@syr.edu>]

This is an updated table.

I think we still have issues.

I want to make sure that "single<type>" notation may be able to be
considered explicitly an element of the specified type, i.e. not a list
forced to have an error check for a length of one element.

However, this may allow two different classes of XACML.

I will not allow an expression such as:

<Apply FunctionId="function:round">
   <SubjectAttributeDesignator AttributeId="FuelLevel"/>
</Apply>

Because the above is type incorrect, because the type signature of
SubjectAttributeDesignator always returns a sequence. I would be forced to
write

<Apply FunctionId="function:round">
    <Apply FunctionId="function:decimal-first">
       <SubjectAttributeDesignator AttributeId="FuelLevel"/>
    </Apply>
</Apply>

to get the correct expression.

In places where I care about the length of the result being 1, I would
include in the condition where the above expression appears,

	<Apply FunctionId="function:integer-equals">
            <Apply FunctionId="function:length">
               <SubjectAttributeDesignator AttributeId="FuelLevel"/>
            </Apply>
	    <AttributeValue>1</AttributeValue>
        </Apply>

to make sure that the result is a singleton. That is inforced by the rule
logic, and not by ERROR at the time of evaluation.


On Thu, 22 Aug 2002, Daniel Engovatov wrote:

>  Polar and me came to a conclusion that we need two separate versions of
> this unary transformation functions: integer-to-decimal, decimal-to-integer,
> round, abs, floor:  restricting existing ones to require single<type> input
> argument format, not ne_sequence<> as in the current posted table, and one
> requiring sequence<type> as input - map version to be used for the use case
> of transofrming multiple values, to be used in set functions.
>
> Proposed new names are:
> map-round(sequence<xs:decimal> taking sequence<xs:decimal>), map-abs,
> map-floor, and so on. I will post updated table later today.
>
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