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Subject: RE: [xacml] xpath-expression datatype
On 26 August, Seth Proctor writes: RE: [xacml] xpath-expression datatype > > > Separate from that, I think it's really late in the game to talk about > > > breaking compatibility with these functions. > > > > That's right. Changing them would break backwards compatibility. > > > > However, it would still be nice to have functions that took restricted > > types for arguments so that they may be type checked. > > I agree. I think this is part of the recent discussions around IP > addreses, regexp expressions, etc. too. > > > > I do not think we should change the parameters now, > > > > Agreed. > > Ok. I agree that we should not break backwards compatibility with 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. 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. 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
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