Get a collection of the attributes of a nodeset - xslt

Question

I have a collection of nodes like this
<node id="1">
<languaje>c</languaje>
<os>linux</os>
</node>
<node id="2">
<languaje>c++</languaje>
<os>linux</os>
</node>
<node id="3">
<languaje>c#</languaje>
<os>window</os>
</node>
<node id="4">
<languaje>basic</languaje>
<os>mac</os>
</node>
And i want to create a new collection of all the properties id's like this
<root>
<token>1</token>
<token>2</token>
<token>3</token>
<token>4</token>
</root>
How can do that

Answer 1

If you can use XQuery you can do it like this:
<root>
{ ($document/node/<node>{string(#id)}</node>) }
</root>
which is imho the clearest solution.
Otherwise you could create a string (not a document) containing your desired result with XPath 2 by concatenating the tags and your ids :
concat("<root>", string-join(for $i in /base/node/#id return concat("<node>",$i,"</node>"), " ") , "</root>")

Answer 2

All you need is
<xsl:output indent="yes"/>
<xsl:template match="*[node]">
<root>
<xsl:apply-templates select="node"/>
</root>
</xsl:template>
<xsl:template match="node">
<token><xsl:value-of select="#id"/></token>
</xsl:template>
If you want to store the result in a variable you can create a result tree fragment with XSLT 1.0 with e.g.
<xsl:variable name="rtf1">
<xsl:apply-templates select="node()" mode="m1"/>
</xsl:variable>
<xsl:template match="*[node]" mode="m1">
<root>
<xsl:apply-templates select="node" mode="m1"/>
</root>
</xsl:template>
<xsl:template match="node" mode="m1">
<token><xsl:value-of select="#id"/></token>
</xsl:template>
Then you can do <xsl:copy-of select="$rtf1"/> to use the result tree fragment, or with 'exsl:node-set` you can process the created nodes with XPath and XSLT e.g.
<xsl:apply-templates select="exsl:node-set($rtf1)/root/token"/>
With XSLT 2.0 there are no longer result tree fragments so you can use the variable like any input without the need for an extension function.

Answer 3

If you wrap all the nodes under a tag, like <nodes> this works:
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="/">
<root>
<xsl:apply-templates select="*" />
</root>
</xsl:template>
<!-- templates -->
<xsl:template match="node">
<token><xsl:value-of select="#id" /></token>
</xsl:template>
</xsl:stylesheet>
Tested on XsltCake
http://www.xsltcake.com/slices/E937yH