1248 2005-04-14 10:23:16 +0000 function-available and compile time errors (editorial) 2005-07-21 18:50:59 +0000 1 1 1 Unclassified XPath / XQuery / XSLT XSLT 2.0 Last Call drafts PC Windows 2000 CLOSED FIXED P2 normal --- 1 davidc mike public-qt-comments oldest_to_newest 3745 0 davidc 2005-04-14 10:23:16 +0000 http://www.w3.org/TR/xslt20/#function-function-available says The function-available function can be used with the xsl:choose and xsl:if instructions,... There probably should be a warning (either here or in the existing note at the end of that section) that using xsl:choose or xsl:if to mark a conditional block of code is unsafe as you may get compile time errors even in the branches that will not be executed. This came up on comp.text.xml this week where a user was trying to use msxml node set with msxml and native temporary tree with saxon 8 but saxon died on the unknown msxsl:node-set function even though it was protected by an xsl:choose, addition of some xsl:use-when tests solved the original poster's problem, but I think that a note here would help (assuming the users read notes in the spec:-) Another minor comment on function-available, most references to the use of this function use the idiom a string that is a valid QName, but 10.3 Stylesheet Functions says: If a stylesheet function has been defined with a particular expanded-QName, then a call on function-available will return true when called with an argument that is a QName that expands to this same expanded-QName. ^^^^^^^^^^^^^^^^^ which probably isn't quite so clear/accurate. David PS, for your records I leave both these points to the editor and accept the resolution, whatever. 3544 1 mike 2005-05-07 22:34:03 +0000 Thanks for these comments, David. The XSL WG reviewed them and asked the editor to revise the text to fix the problems identified. This I have done. In the intro to function-available, I have retained the reference to use-when and have dropped the reference to choose/if. I've then added two examples, one showing use of function-available with xsl:choose to achieve portability between XSLT 1.0 and 2.0, and a second example showing function-available with use-when to achieve portability between 2.0 and a future XSLT version. In the description of stylesheet functions, I've changed "QName" here to "lexical QName". Thankyou for you advance acceptance of the outcome! Michael Kay for the XSL WG