- From: Mary Holstege <mary@cerisent.com>
- Date: Sun, 15 Feb 2004 11:29:11 -0800
- To: public-qt-comments@w3.org
Query Lang [Appendix B] xs:string/xs:anyURI Given the lack of a formal derivation relation between xs:string and xs:anyURI, there is a serious usability issue for any function (such as the fn:doc function) that expects a URI as an argument. If the argument is declared as xs:string, users will get type errors if they pass data that happens to be xs:anyURI. Conversely, if the argument is declared as xs:anyURI, users will get type errors if they pass string literals. Either situation is likely to occur in practice. We therefore request that xs:anyURI and xs:string be subject to special promotion rules, such as those applying to xs:float and xs:double to avoid this problem. Specifically: A function that expects a parameter $p of type xs:string can be invoked with a value of type xs:anyURI and a function that expects a parameter $p of type xs:anyURI can be invoked with a value of type xs:string.
Received on Tuesday, 17 February 2004 11:09:58 UTC