Re: Scope of uniqueness of generate-id()

Until today I was thinking that xslt functions have no side effects
(provided extensions are not considered). 
It has turned out that this is not correct.
That changes the picture (at least for me).
Many possible optimizations are not safe.

Thanks.
--
http://www.nesterovsky-bros.com/
Vladimir Nesterovsky


-------- Original Message --------
> From: "David Carlisle" <davidc@xxxxxxxxx>
> Sent: Thursday, November 20, 2008 3:34 PM
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject: Re:  Scope of uniqueness of generate-id()
> 
> >> Does this mean that theoretically one can create a "generator",
> >> function returning different values per each call?
> >
> >  No, two calls with the same node are guaranteed to return the same
> >value.
> 
> That's true but what Vladimir  meant was this:
> 
> 
> <xsl:stylesheet  version="2.0" 
> 		 xmlns:f="data:,f"
> 		 xmlns:xs="http://www.w3.org/2001/XMLSchema"
> 		 xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
>  
> 
> <xsl:template name="main">
> 
> : <xsl:sequence select="f:fun()"/>
> : <xsl:sequence select="f:fun()"/>
> : <xsl:sequence select="f:fun()"/>
> : <xsl:sequence select="f:fun()"/>
> : <xsl:sequence select="f:fun()"/>
> : <xsl:sequence select="f:fun()"/>
> : <xsl:sequence select="f:fun()"/>
> </xsl:template>
> 
> <xsl:function name="f:fun" as="xs:string">
>  <xsl:variable name="x">!</xsl:variable>
>  <xsl:sequence select="generate-id($x)"/>
> </xsl:function>
> 
> </xsl:stylesheet>
> 
> 
> 
> 
> $ saxon9 -it main gen.xsl
> <?xml version="1.0" encoding="UTF-8"?>
> 
> : tt1
> : tt2
> : tt3
> : tt4
> : tt5
> : tt6
> : tt7
> 
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