4696 2007-06-22 20:46:44 +0000 [XSLT 2.0] type-available() in use-when 2007-10-10 20:49:58 +0000 1 1 1 Unclassified XPath / XQuery / XSLT XSLT 2.0 Recommendation PC Windows XP CLOSED FIXED P2 normal --- 1 mike mike public-qt-comments oldest_to_newest 15524 0 mike 2007-06-22 20:46:44 +0000 The stated intent of the type-available() function is to allow conditional logic to be included in use-when expressions. See 18.1.4: "The type-available function can be used, for example with the [xsl:]use-when attribute (see 3.12 Conditional Element Inclusion), to explicitly control how a stylesheet behaves if a particular schema type is not available in the static context." The function returns true if the type is present in the in-scope schema type definitions for that expression. However, the static context for a use-when expression (3.12) contains only "The type definitions that would be available in the absence of any xsl:import-schema declaration" - that is, it contains no user-defined types. This essentially makes the function (a very late addition to the spec) useless. 15724 1 mike 2007-06-29 07:40:53 +0000 From the minutes of 29 Jun 2007: Perhaps just add a note pointing out that user-defined types are not available (and so the function is not as useful as one might want)? Or a possible approach to a solution is that if module A imports a schema S, and then imports/includes module B, then the user-defined types of schema S are available for inspection within module B. Need to check how disruptive this would be to implementors. 15733 2 colin 2007-07-02 15:26:26 +0000 The actual use case which drove the addition was the then inability to know if types such as xs:int were available to a basic XSLT processor. Adding the function solved that problem, so it is not useless. 15883 3 mike 2007-07-19 16:40:14 +0000 Decision on 19/7/2007 - we will essentially leave the spec as it is, and change the wording around it to make it clear what you can and can't achieve by using this facility. 17127 4 sca.w3c 2007-10-10 20:48:54 +0000 M Kay to re-phrase descriptive text. Keep type-available() function as written. Descriptive text fixed as erratum E15