RE: XSLT 2.0 *and* XSLT 1.0 validation -- how to?
> So better to have the stylesheets as 1.0, but individual templates as > 2.0? > If you want to develop a stylesheet that's capable of operating on a 1.0 processor but can also take advantage of 2.0 features when available, then I would be inclined to put the 2.0-dependent parts in separate modules, and to assemble the complete stylesheet from different combinations of modules in the two cases. This isn't the only way of doing it - you could also exploit 1.0 forwards compatibility mode - but it's probably the cleanest. If you're in transition from 1.0 to 2.0, and want to do the conversion one small step at a time, but without a need to keep the stylesheet working under 1.0, then there might be some sense in using the version="2.0" attribute only around constructs that require (or have been converted to) 2.0. Unfortunately, though, the obvious place to put such a version attribute is on the xsl:template elements, but 1.0 doesn't allow this - it allows it only on the xsl:stylesheet element or on literal result elements. So again, moving the 2.0 code into a separate module that you then include might be a more workable solution. Incidentally, we have recently changed the XPath rules so that backwards compatibility mode really means what it says - if your stylesheet specifies version="1.0", you now continue to get all the old XPath 1.0 quirks, for example that ["4.0"<="4"] is true while ["4.0"<"4" or "4.0"="4"] is false. Although this reduces the problem in moving from 1.0 to 2.0-in-compatibility-mode, it's not a panacea, because the same problems still exist, you now get them when moving from 2.0-in-compatibility-mode to "2.0 proper". This is particularly true for the introduction of string comparisons, where the meaning of a construct like @price<@discount now changes between 2.0-in-compatibility-mode and 2.0 proper. Michael Kay
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