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(_at_)nag(_dot_)co(_dot_)uk>
Sent: Thursday, November 20, 2008 3:34 PM
To: xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com
Subject: Re: [xsl] 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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