Re: How to detect if the context item exists

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Subject: Re: How to detect if the context item exists
From: Michael Kay <mike@xxxxxxxxxxxx>
Date: Fri, 01 Jul 2011 00:19:46 +0100

On 01/07/2011 00:03, David Carlisle wrote:

On 30/06/2011 21:23, Michael Kay wrote:
No, within a named template it's not statically decidable. The named
template might be called from within a function.
yes (that's the usual way the context gets undefined) but what I meant was that the author of the stylesheet can write the template as
<xsl:template name=x">
<xsl:param name="hascontext" select="true()"/>
..

XSLT 3.0 will allow a named template to declare:

<xsl:context-item
   as? = sequence-type
   use? = "required" | "optional" | "prohibited" />

"optional" is the current behaviour"; required means it's an error to call the template without a context item; "prohibited" means any context item that exists in the caller isn't made available to the called template.

Michael Kay
Saxonica

Current Thread
XPath for parent nodes, but excluding their children, (continued) Joel Dubien - 30 Jun 2011 21:25:25 -0000 Syd Bauman - 30 Jun 2011 23:10:45 -0000 Michael Kay - 30 Jun 2011 23:25:19 -0000 David Carlisle - 30 Jun 2011 23:04:05 -0000 Michael Kay - 30 Jun 2011 23:19:58 -0000 <= David Carlisle - 30 Jun 2011 23:35:08 -0000

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