[Date Prev] | [Thread Prev] | [Thread Next] | [Date Next] -- [Date Index] | [Thread Index] | [List Home]
Subject: RE: [xacml] xpath-expression datatype
On Fri, 27 Aug 2004, Anne Anderson wrote: > existing functions. Yet I think "string to be interpreted as an > XPath expression" does not give implementers or policy writers > sufficient type checking capability. I can also see extension > functions defined that would use an "xpath-expression" datatype, > and those would not necessarily be for hierarchical resources. > > I suggest we extend the definition of the existing XPath-based > functions in A.3.14 to accept EITHER "...#string" OR > "...:xpath-expression", and indicate that "...#string" is > deprecated. And then leave the definition of the > "...:xpath-expression" datatype in the core specification. This > does not break backwards compatibility. That will break the type system. > Another option would be to re-define the XPath-based functions in > A.3.14 with new identifiers: urn:oasis:names:gc:xacml:2.0:..., > and then change the definitions to use "...:xpath-expression". > Then 2.0 implementations that are backwards compatible can > continue to support the 1.0 versions, but the 2.0 versions can be > strongly typed. That would be the better way. Still, there seems to be a desire to "build" these expressions on the fly. So, you in order to use the string functions to make them, you would need a type coercive function that takes a string type to an xpath expression type. It's not a do nothing function either. (This function would have the added benefit of throwing an Indeterminate if what you built on the fly was an invalid xpath expression). Cheers, -Polar > Anne > -- > Anne H. Anderson Email: Anne.Anderson@Sun.COM > Sun Microsystems Laboratories > 1 Network Drive,UBUR02-311 Tel: 781/442-0928 > Burlington, MA 01803-0902 USA Fax: 781/442-1692 > > > To unsubscribe from this mailing list (and be removed from the roster of the OASIS TC), go to http://www.oasis-open.org/apps/org/workgroup/xacml/members/leave_workgroup.php. >
[Date Prev] | [Thread Prev] | [Thread Next] | [Date Next] -- [Date Index] | [Thread Index] | [List Home]