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Subject: Proposed Feature #22
Attached is the description for proposed 2.0 feature #22
(time-in-range). The function is being proposed as an errata item since
it represents functionality that the 1.0 specification was supposed to
contain, but does not.
seth
22: time-in-range function
Provide a function for comparing that a time of day is between two
other times of day.
MOTIVATING USE-CASE AND REQUIREMENT
The XACML 1.0 specification includes a standard representation of time
in the http://www.w3.org/2001/XMLSchema#time datatype, and also
includes functions for operating on time values. Some of these
functions are comparators. One of the motivating uses for these
comparison functions was to be able to determine whether some time
falls between two other times (eg, is the access time between
09:00:00 and 17:00:00). This is a very common access pattern that is
needed by many.
Unfortunately, due to the way that time is represented, the comparison
functions don't actually provide this functionality with any
guarantees. This was discussed in a thread starting with
http://lists.oasis-open.org/archives/xacml/200307/msg00044.html
Therefore, there is no standard way to see if a given time falls in a
given range of time. The proposed function provides that
functionality. Because this is a widely needed feature, it's important
to have a standard way to support this range comparison.
This feature is being proposed as an errata, since it fixes a problem
with the specification (namely, there is supposed to be support for
checking if a time is in a range, but the current specification is in
error since it doesn't actually support this use case).
SUMMARY OF OPEN ISSUES
There is no open issue for this feature, though this change is related
to open issues associated with the http://www.w3.org/2001/XMLSchema#time
datatype and its associated functions. These were first raised in
http://lists.oasis-open.org/archives/xacml/200307/msg00044.html
These issues were discussed on the list, and there was tentative
agreement on the given proposal. The issue is currently in front of
the XMLSchema group.
PROPOSED SOLUTION
A proposal was already made in
http://lists.oasis-open.org/archives/xacml/200307/msg00044.html
for a function named time-in-range that takes 3 parameters (all of
type http://www.w3.org/2001/XMLSchema#time), and returns true iff the
first parameter falls between the second and the third parameters. In
early discussions on the TC list, this solution seems to be
acceptable.
DETAILED SOLUTION
This requires no schema changes. Details to follow when a solution has
been agreed upon.
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