Merge 2 XML files and modifying the attribute values

I have two xml files. I want to merge them and make some arithmetic with a few attributes. Please provide some ideas. I am using a standard xslt to merge the files.

File 1:

<coverage branch-rate="0.5125" branch-total="50" line-rate="0.00593031875463">  

File 2:

<coverage branch-rate="0.5" branch-total="40" line-rate="1.0">  

Expected Result File

<coverage branch-rate="(0.5125*50 + 05*40)/(50+40)" branch-total="50" line-rate="0.00593031875463"> 


This transformation:

<xsl:stylesheet version="1.0" xmlns:xsl="">
 <xsl:output omit-xml-declaration="yes" indent="yes"/>

 <xsl:param name="pFile1" select="'file:///c:/temp/delete/file1.xml'"/>
 <xsl:param name="pFile2" select="'file:///c:/temp/delete/file2.xml'"/>

 <xsl:variable name="vF2Cover" select="document($pFile2)/coverage"/>

 <xsl:template match="/">
   <xsl:apply-templates select="document($pFile1)/coverage"/>

 <xsl:template match="coverage">
   <coverage branch-rate=
    "{(@branch-rate*@branch-total + $vF2Cover/@branch-rate*$vF2Cover/@branch-total)
      div (@branch-total+$vF2Cover/@branch-total)
    "{@branch-total*(@branch-total>= $vF2Cover/@branch-total)
     $vF2Cover/@branch-total*($vF2Cover/@branch-total >@branch-total)
    "{@line-rate*($vF2Cover/@line-rate >= @line-rate)
     $vF2Cover/@line-rate*(@line-rate > $vF2Cover/@line-rate)

when applied on any XML document (not used), and having the two provided XML documents reside in:


<coverage branch-rate="0.5125" branch-total="50" line-rate="0.00593031875463">

and c:/temp/delete/file2.xml:

<coverage branch-rate="0.5" branch-total="40" line-rate="1.0">

produces the wanted, correct result:

<coverage branch-rate="0.5069444444444444" branch-total="50" line-rate="0.00593031875463" />

You can use XSLT and the document function. Document loads another xml file into the xslt processing. The example does only a simple arithmetic operation. You need to modify it.

<xsl:template match="coverage">
    <xsl:variable name="branchRateFromFile1" select="@branch-rate"/>
    <xsl:variable name="branchRateFromFile2" select="document(FILE2)/coverage/@branch-rate"/>
        <xsl:attribute name="branch-rate"><xsl:value-of select="number($branchRateFromFile1)+number($branchRateFromFile2)"/></xsl:attribute>
        <xsl:apply-templates select="*"/>

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