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RE: XPath 2.0 Best Practice Issue: Graceful Degradation

• From: "Michael Kay" <mike@s...>
• To: "'Costello, Roger L.'" <costello@m...>,<xml-dev@l...>
• Date: Fri, 25 Jan 2008 15:41:29 -0000

> Ah, you are bringing up an excellent point: how do we design 
> an XPath statement that gracefully degrades when the expected 
> schema checking is absent?

You can check whether validation has been performed using "instance of"

if (airplane instance of schema-element(airplane)) then ...

Or in XSLT you can do it more declaratively:

<xsl:template match="document-node(schema-element(airplane))">
   normal case
</xsl:template>

<xsl:template match="/">
  error case
</xsl:template>


Michael Kay
http://www.saxonica.com/

• References:
  • XPath 2.0 Best Practice Issue: Graceful Degradation
    • From: "Costello, Roger L." <costello@m...>
  • Re: XPath 2.0 Best Practice Issue: Graceful Degradation
    • From: David Carlisle <davidc@n...>
  • RE: XPath 2.0 Best Practice Issue: Graceful Degradation
    • From: "Costello, Roger L." <costello@m...>