slide 69

XPath 1.0 Compatibility Mode

( in XSLT and other environments)

• Some things happen differently in XPath 2.0 and XPath 1.0
  (e.g. string(note) when count(note) > 1)
• What happens with a 1.0 stylesheet in a 2.0 processor, or the reverse?
  • Mostly, things run okay
  • When not, mostly you can expect errors (not silent variances)
  • “Clever” use of XPath 1.0 can get you into trouble
  • Saying xsl:stylesheet version="1.0" asks that a stylesheet be run in XPath 1.0 compatibility mode by a 2.0 processor
  • This irons out almost all discrepancies between data models but see http://www.w3.org/TR/2003/WD-xpath20-20031112/#id-backwards-compatibility
  • Does not actually restrict you to XPath 1.0
    • in a processor that can handle 2.0!
    • if you want to do that — use a 1.0 processor