How to count elements with same attribute value

Question

I'm sure this is an easy one but i'm just not to see the wood for the trees.

I'm having an XML that look like this:

   <root>
    <profil>
        <e1 a="2">1</e1>
        <m1 a="3">1</m1>
        <e2 a="4">1</e2>
        <m2 a="5">1</m2>
    </profil>
    <profil>
        <e1 a="5">1</e1>
        <m1 a="3">1</m1>
        <e2 a="4">1</e2>
        <m2 a="4">1</m2>
    </profil>
    <profil>
        <e1 a="7">1</e1>
        <m1 a="7">1</m1>
        <e2 a="4">1</e2>
        <m2 a="2">1</m2>
    </profil>
</root>

Now I want to know how many /m*/@a are equal to e*/@a per /profil. So I came up with the following XSLT:

<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:template match="*">
        <xsl:element name="root">
            <xsl:for-each select="/root/profil">
                <xsl:element name="count">
                    <xsl:value-of select="count(*[contains(name(), 'm') and ./@a = //*[contains(name(),'e')]/@a])"/>
                </xsl:element>
            </xsl:for-each>
        </xsl:element>
    </xsl:template>
</xsl:stylesheet>

But the result is wrong:

<root>
    <count>1</count>
    <count>1</count>
    <count>2</count>
</root>

It should be

<root>
    <count>0</count>
    <count>1</count>
    <count>1</count>
</root>

Does anyone has a suggestion what I'm doing wrong?

Answer 1

Replace the XPath with the correct one, which is:

<xsl:value-of select="count(*[substring(name(),1,1)='m' 
      and ./@a = ../*[substring(name(),1,1)='e']/@a])"/>

I've used substring to match the first attribute character in place of contains which matches any character in a string.