- From: <xquery@attbi.com>
- Date: Sun, 08 Jun 2003 23:52:58 +0000
- To: public-qt-comments@w3.org
Given two opaque expressions $x and $y, does XQuery have a convenient expression that converts $x to the same (dynamic or static) type as $y? I can write a gnarly (60+ lines, just to handle singletons) typeswitch that converts $x to the dynamic type of $y, provided I'm willing to settle for the built-in XQuery types only. I haven't found any way to handle user-defined types, or to convert $x to the static type of $y. Strangely, this operation does come up (at least for dynamic types); for example, the general comparison operators perform this conversion on xdt:untypedAtomic values in some cases. Perhaps there should be a built-in function like convert-to-same-type-as($exprToConvert as item*, $type as item*) as item* ? Cheers, Michael Brundage Writing as Author, "XQuery: The XML Query Language" (Addison-Wesley, to appear 2003) Co-author, "Professional XML Databases" (Wrox Press, 2000) not as Technical Lead Common Query Runtime/XML Query Processing WebData XML Team Microsoft
Received on Sunday, 8 June 2003 19:53:04 UTC