Applying sequential numbering as attribute values of child nodes in one parent node, and then applying these in a different order in a sibling node

Good morning, I have the following (bilingual) XML snippet:


<?xml version="1.0" encoding="UTF-8"?>
<tmx version="1.4">
<body>
    <tu>
        <prop type="x-Context">-2050338055591740051, -2050338055591740051</prop>
        <prop type="x-Origin">TM</prop>
        <prop type="x-ConfirmationLevel">Translated</prop>
        <tuv>
            <seg>
                <ele>The text </ele>
                <ele>
                    <ph x="0" type="QIAsymphony"/>
                </ele>
                <ele> goes </ele>
                <ele>
                    <ph x="0" type="470"/>
                </ele>
                <ele> here </ele>
                <ele>
                    <ph x="0" type="471"/>
                </ele>
                <ele>.</ele>
            </seg>
        </tuv>
        <tuv>
            <seg>
                <ele>El texto </ele>
                <ele>
                    <ph x="0" type="QIAsymphony"/>
                </ele>
                <ele> se mete </ele>
                <ele>
                    <ph x="0" type="471"/>
                </ele>
                <ele> aquí </ele>
                <ele>
                    <ph x="0" type="470"/>
                </ele>
                <ele>.</ele>
            </seg>
        </tuv>
    </tu>
</body>
 </tmx>

I would like to first of all number the x attribute values of the ph elements in the first tuv/seg node, from 1 to 3 (in this case).

However, the result I am getting is this:


<tuv>
            <seg>
                <ele>The text </ele>
                <ele>
                    <ph x="2" type="QIAsymphony"/>
                </ele>
                <ele> goes </ele>
                <ele>
                    <ph x="4" type="470"/>
                </ele>
                <ele> here </ele>
                <ele>
                    <ph x="6" type="471"/>
                </ele>
                <ele>.</ele>
            </seg>
        </tuv>

This is based on the following XSLT Stylesheet:


<xsl:stylesheet version="1.0" 
xmlns:xsl="http://ift.tt/tCZ8VR">
<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>
<xsl:strip-space elements="*"/>



 <xsl:template match="tmx">
 <tmx><xsl:attribute name="version"><xsl:value-of select="./@version"/></xsl:attribute>
    <xsl:apply-templates/>
</tmx>
 </xsl:template>


<xsl:template match="body">
<body>
    <xsl:apply-templates/>
</body>
</xsl:template>

<xsl:template match="tuv">
<tuv>
    <xsl:apply-templates/>
</tuv>
</xsl:template>

<xsl:template match="prop">
<prop><xsl:attribute name="type"><xsl:value-of select="./@type"/></xsl:attribute>
    <xsl:apply-templates/>
</prop>
</xsl:template>


<xsl:template match="tu">
<tu>
    <xsl:apply-templates/>
</tu>
</xsl:template>

<xsl:template match="tuv[1]/seg">


<seg>
<xsl:for-each select="ele"> 
<xsl:choose>
<xsl:when test="child::ph">


<ele><ph><xsl:attribute name="x">

<xsl:number/>
</xsl:attribute>

<xsl:attribute name="type">

<xsl:value-of select="ph/@type"/>
</xsl:attribute>


</ph></ele>
</xsl:when>
</xsl:choose>   
 <xsl:choose>
<xsl:when test="child::text()">

<xsl:copy-of select="."/>
</xsl:when>
</xsl:choose>   

</xsl:for-each>



</seg>
</xsl:template>


</xsl:stylesheet>

In order words, I need the following result:


  <tuv>
            <seg>
                <ele>The text </ele>
                <ele>
                    <ph x="1" type="QIAsymphony"/>
                </ele>
                <ele> goes </ele>
                <ele>
                    <ph x="2" type="470"/>
                </ele>
                <ele> here </ele>
                <ele>
                    <ph x="3" type="471"/>
                </ele>
                <ele>.</ele>
            </seg>
        </tuv>

Finally, based on the type attribute values in the first tuv/seg node, I need to apply the corresponding x values to the x attributes in the second tuv/seg node (which in this case will be in a different order):


 <tuv>
            <seg>
                <ele>El texto </ele>
                <ele>
                    <ph x="1" type="QIAsymphony"/>
                </ele>
                <ele> se mete </ele>
                <ele>
                    <ph x="3" type="471"/>
                </ele>
                <ele> aquí </ele>
                <ele>
                    <ph x="2" type="470"/>
                </ele>
                <ele>.</ele>
            </seg>
        </tuv>

Any assistance would be greatly appreciated.

Applying sequential numbering as attribute values of child nodes in one parent node, and then applying these in a different order in a sibling node

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