XSLT, Appending previous data to the next iteration of a for-each

I'm in need of a particular solution to my XSLT and I've struggling to figure out how to get it to work. Right now my 开发者_如何学PythonXML is structured like this

<DataX>
   <DataY>
       <fieldy>A</fieldy>
       <fieldx>B</fieldx>
       <Data1>
           <field1>1</field1>
           <field2>2</field2>
       </Data1>
       <Data2>
           <field3>3</field3>
           <field4>4</field4>
       </Data2>
       <Data3>
           <field5>5</field5>
           <field6>6</field6>
       </Data3>
   </DataY>
</DataX>

What I need to do is append the contents of <DataY> <field1> <field2> to every instance of the inner data fields. Without altering the original XML

Like this

A B 1 2    A B 3 4    A B 5 6

Like so, I added spaces for clarity.

I've tried some inner for-each statements and few other things. I've not to experience with XSLT but maybe I'm over thinking it. I'm just not sure how to obtain the A B data once a pass has been made using a for-each. Any Thoughts?

---

This transformation:

<xsl:stylesheet version="1.0"
 xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
 <xsl:output method="text"/>
 <xsl:strip-space elements="*"/>

 <xsl:variable name="vPrefix">
  <xsl:for-each select="/*/DataY/*[not(starts-with(name(),'Data'))]">
    <xsl:value-of select="."/>
  </xsl:for-each>
 </xsl:variable>

 <xsl:template match="/*/*/*[starts-with(name(),'Data')]">
  <xsl:value-of select="concat($vPrefix, .)"/>
 </xsl:template>

 <xsl:template match="text()"/>
</xsl:stylesheet>

when applied on the provided XML document:

<DataX>
    <DataY>
        <fieldy>A</fieldy>
        <fieldx>B</fieldx>
        <Data1>
            <field1>1</field1>
            <field2>2</field2>
        </Data1>
        <Data2>
            <field3>3</field3>
            <field4>4</field4>
        </Data2>
        <Data3>
            <field5>5</field5>
            <field6>6</field6>
        </Data3>
    </DataY>
</DataX>

produces the wanted, correct result (no intervening spaces as they were added in the question "for clarity"):

AB12AB34AB56

---

You should get started with this transform.

---

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
    <xsl:output method="text"/>
    <xsl:strip-space elements="*"/>

    <xsl:template match="/*/*">
        <xsl:apply-templates select="*[2]/following-sibling::*" mode="data"/>
    </xsl:template>

    <xsl:template match="*" mode="data">
        <xsl:value-of select="concat(../*[1],../*[2],*[1],*[2])"/>
    </xsl:template>

</xsl:stylesheet>

When applied on this input:

<DataX>
   <DataY>
       <fieldx>A</fieldx>
       <fieldy>B</fieldy>
       <Data1>
           <field1>1</field1>
           <field2>2</field2>
       </Data1>
       <Data2>
           <field3>3</field3>
           <field4>4</field4>
       </Data2>
       <Data3>
           <field5>5</field5>
           <field6>6</field6>
       </Data3>
   </DataY>
</DataX>

It produces:

AB12AB34AB56