How to write an XSLT stylesheet to make the node with id=5

[PsYcHo 1]

Suppose you have this document:

<root>
<node id="1">
<node id="4"/>
<node id="5"/>
</node>
<node id="2"/>
<node id="3"/>
</root>

How to write an XSLT
stylesheet to make the node with id=5 a child of
the node with id=2?

The resulting document should look as follows:

<root>
<node id="1">
<node id="4"/>
</node>
<node id="2">
<node id="5"/>
</node>
<node id="3"/>
</root>

Thanks,

[Modifier]

mostly you want to copy

<xsl:template match="*">
<xsl:copy>
<xsl:copy-of select="@*"/>
<xsl:apply-templates/>
</xsl:copy>
</xsl:template>

but you want to lose id 5

<xsl:template match="node[@id='5']"/>

and you want it to appear again in id 2

<xsl:template match="node[@id='2']">
<xsl:copy>
<xsl:copy-of select="@*|//node[@id='5']"/>
<xsl:apply-templates/>
</xsl:copy>
</xsl:template>

[PsYcHo 1]

Thanks, simple and elegant.

Could you give me a hint how to parameterise this?

The following approach doesn't seem to work:

------------------------------------------------------
<xsl:stylesheet
version="1.0"
xmlnssl="http://www.w3.org/1999/XSL/Transform">

<xslaram name="nodeparent" />
<xslaram name="nodeid" />

<xsl:template match="*">
<xsl:copy>
<xsl:copy-of select="@*"/>
<xsl:apply-templates/>
</xsl:copy>
</xsl:template>

<xsl:template match="node[@id='{$nodeid}']"/>

<xsl:template match="node[@id='{$nodeparent}']">
<xsl:copy>
<xsl:copy-of select="@*|//node[@id='{$nodeid}']"/>
<xsl:apply-templates/>
</xsl:copy>
</xsl:template>
</xsl:stylesheet>


Easy enough to put an <xsl:choose> construct inside the identity
transform, and ignore the node satisfying "@id = $nodeid'. But how can
we then add that node to $nodeparent?

[MindSpace]

Not yet tested, but ...

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns="http://www.w3.org/1999/xhtml"
xmlnssl="http://www.w3.org/1999/XSL/Transform">

<!-- put "id=5" into "id=2" -->
<xsl:template match="*[@id='2']">
<xsl:copy>
<xsl:apply-templates select="*[@id='5']"/>
<xsl:apply-templates select="@*|node()"/>
</xsl:copy>
</xsl:template>

<!-- match "id=5" and do NOTHING -->
<xsl:template match="*[@id='5']"/>

<!-- copy all other stuff -->
<xsl:template match="@*|node()">
<xsl:copy>
<xsl:apply-templates select="@*|node()"/>
</xsl:copy>
</xsl:template>
</xsl:stylesheet>

[Modifier]

I knew you were going to ask that

<xsl:template match="node[@id='{$nodeid}']"/>


that would never work, { _never_ has any special meaning in an XPath
expression or, as here, in an XSLT pattern. They are used to _surround_
Xpath expressions in XSLT Attribute value templates, but they are not
part of Xpath.

The syntax should be

<xsl:template match="node[@id=$nodeid]"/>

except that in a failed attempt to prevent circular definitions, any use
of variables in match patterns is outlawed in XSLT1 so you can't do
this. (You will be able to do it in XSLT2 as this restriction is
dropped in XSLT2 draft.)

Similarly for

<xsl:copy-of select="@*|//node[@id='{$nodeid}']"/>

except that here of course you can use a variable in XSLT1:

<xsl:copy-of select="@*|//node[@id=$nodeid]"/>

The reason why the restriction on variables in match patterns is
annoying (and will be removed) is that it's easy to circumvent it, in
this case for example you could do:

<xsl:template match="node">
<xsl:choose>
<xsl:when test="@id='$nodeid"/>
<xsltherwise>
<xsl:copy>
<xsl:copy-of select="@*"/>
<xsl:if test="@id=$nodeparent">
<xsl:copy-of select="//node[@id='$nodeid']"/>
</xsl:if>
<xsl:apply-templates/>
</xsl:copy>
</xsltherwise>
</xsl:choose>
</xsl:template>

[Modifier]

oops sorry I left in two of your quotes

<xsl:copy-of select="//node[@id='$nodeid']"/>
^ ^


<xsl:copy-of select="//node[@id=$nodeid]"/>