Replace values using Key defined with inline variable - xslt

Question

I'm trying to understand the usage of keys and can't get my example to work.
Starting with this XML:
<items>
<item>Blue</item>
<item>Green</item>
<item>Orange</item>
</items>
I want to get this output XML:
<items>
<item>PURPLE</item>
<item>BLACK</item>
<item>PINK</item>
</items>
I defined the mapping directly in a variable in the XSLT transformation:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
version="2.0">
<xsl:output method="xml" indent="yes"/>
<xsl:variable name="mappings">
<mapping orig="Blue" repla="PURPLE"/>
<mapping orig="Green" repla="BLACK"/>
<mapping orig="Orange" repla="PINK"/>
</xsl:variable>
<xsl:key name="mappingsKey" match="$mappings/mapping" use="#orig"/>
<xsl:template match="items">
<xsl:copy>
<xsl:apply-templates/>
</xsl:copy>
</xsl:template>
<xsl:template match="item">
<xsl:copy>
<xsl:value-of select="key('mappingsKey',.)"/>
</xsl:copy>
</xsl:template>
</xsl:stylesheet>
I know I'm missing the instruction to tell which is the replacement value, but don't know how to define it.
Example available here: https://xsltfiddle.liberty-development.net/ejivdHp/1
Thanks.

Answer 1

The $mappings variable is in a different document than the processed XML. You need to point the key() function to there. And you also need to select the repla attribute:
<xsl:value-of select="key('mappingsKey', ., $mappings)/#repla"/>
Referencing the variable in the match pattern of the xsl:key element is meaningless.
https://xsltfiddle.liberty-development.net/ejivdHp/2