Using XPATHs from file and adding relevant attribute - xslt

Question

May be my XSL approach is wrong? please correct me the way to handle this situation
I want to grab XPATHs and Attrs from a mapping file, then use XPATH to match, and apply attributes to XML.
Here is my 3 inputs files:
mappings.xml
<?xml version="1.0" encoding="UTF-8"?>
<mappings>
<map xpath="//title" class="title" others="moreToCome" />
<map xpath="//subtitle" class="subtitle" others="moreToCome" />
<map xpath="//p" class="p" others="moreToCome" />
</mappings>
Source.xml
<?xml version="1.0" encoding="UTF-8"?>
<root>
<title>title text</title>
<subtitle>subtitle text</subtitle>
<p>subtitle text</p>
</root>
StyleMapping.xsl
<?xml version="1.0" encoding="iso-8859-1"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:param name="fMappings" select="document('mappings.xml')" />
<xsl:variable name="xpath"><xsl:text>justToMakeItGlobal</xsl:text></xsl:variable>
<xsl:template match="node()|#*">
<xsl:copy>
<xsl:apply-templates select="node()|#*" />
</xsl:copy>
<!-- loop thru map in mappings.xml -->
<xsl:for-each select="$fMappings//mappings/map">
<xsl:call-template name="dyn">
<xsl:with-param name="xpath" select="#xpath" />
<xsl:with-param name="class" select="#class" />
<xsl:with-param name="others" select="#others" />
</xsl:call-template>
</xsl:for-each>
</xsl:template>
<xsl:template match="$xpath" mode="dyn">
<xsl:param name="xpath"/>
<xsl:param name="class"/>
<xsl:param name="others"/>
<xsl:attribute name="class"><xsl:value-of select="$class" /></xsl:attribute>
<xsl:attribute name="others"><xsl:value-of select="$others" /></xsl:attribute>
</xsl:template>
</xsl:stylesheet>
This is what is planning to do, but i'm not getting the correct way of doing it in XSLT:
1. Read mappings.xml file
2. Loop thru each map tag
3. grab xpath and attr's
4. apply template match/select with above xpath
5. add attr's to above selected nodes
output.xml
<?xml version="1.0" encoding="UTF-8"?>
<root>
<title class="title" others="moreToCome">title text</title>
<subtitle class="subtitle" others="moreToCome">subtitle text</subtitle>
<p class="p" others="moreToCome">subtitle text</p>
</root>

Answer 1

I don't think you can have a template with a calculated match pattern. Let me suggest a different approach:
mappings.xml
<?xml version="1.0" encoding="UTF-8"?>
<mappings>
<map elem="title" class="Title" others="moreToCome1" />
<map elem="subtitle" class="Subtitle" others="moreToCome2" />
<map elem="p" class="P" others="moreToCome3" />
</mappings>
stylesheet
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" version="1.0" encoding="utf-8" indent="yes"/>
<xsl:variable name="mappings" select="document('mappings.xml')/mappings" />
<xsl:template match="*">
<xsl:variable name="elem" select="name()" />
<xsl:copy>
<xsl:copy-of select="#*"/>
<xsl:if test="$elem = $mappings/map/#elem">
<xsl:attribute name="class">
<xsl:value-of select="$mappings/map[#elem=$elem]/#class"/>
</xsl:attribute>
<xsl:attribute name="others">
<xsl:value-of select="$mappings/map[#elem=$elem]/#others"/>
</xsl:attribute>
</xsl:if>
<xsl:apply-templates/>
</xsl:copy>
</xsl:template>
</xsl:stylesheet>
Testing with the following source XML:
<?xml version="1.0" encoding="UTF-8"?>
<root>
<title original="yes">title text</title>
<subtitle>subtitle text</subtitle>
<p>para text</p>
<nomatch attr="test">another text</nomatch>
</root>
results in:
<?xml version="1.0" encoding="utf-8"?>
<root>
<title original="yes" class="Title" others="moreToCome1">title text</title>
<subtitle class="Subtitle" others="moreToCome2">subtitle text</subtitle>
<p class="P" others="moreToCome3">para text</p>
<nomatch attr="test">another text</nomatch>
</root>