Pick up value from one XML tag and put in another tag with XSLT?

Question

I have a XML like this

<?xml version="1.0" encoding="UTF-8"?>
<Orders>
    <Order>
        <Order_Number>8221</Order_Number>
        <Order_Date>2019-03-12 04:28</Order_Date>
        <Billing_First_Name>sdfsdff</Billing_First_Name>
        <Billing_Last_Name>zam</Billing_Last_Name>
        <Billing_Company/>
        <Billing_Address>asd aasdasd, asd</Billing_Address>
        <Billing_City>asd</Billing_City>
        <Billing_State/>
        <Billing_Postcode>5968</Billing_Postcode>
        <Billing_Country>SE</Billing_Country>
        <Billing_Email>sdfdsf@sdfsdf.se</Billing_Email>
        <Billing_Phone>454565798</Billing_Phone>
        <Shipping_First_Name>sdfsdf</Shipping_First_Name>
        <Shipping_Last_Name>sdfsdf</Shipping_Last_Name>
        <Shipping_Address>asd aasdasd, asd</Shipping_Address>
        <Shipping_City>asd</Shipping_City>
        <Shipping_State/>
        <Shipping_Postcode>5968</Shipping_Postcode>
        <Shipping_Country>XX</Shipping_Country>
        <Products>
            <Product>
                <Line_Id>1</Line_Id>
                <Name>My-Love</Name>
                <Product_Id>7978</Product_Id>
                <Product_Variation>A4</Product_Variation>
                <Variation_Id>0</Variation_Id>
                <Qty>1</Qty>
            </Product>
            <Product>
                <Line_Id>2</Line_Id>
                <Name>Other</Name>
                <Product_Id>7697</Product_Id>
                <Product_Variation>A5</Product_Variation>
                <Variation_Id>0</Variation_Id>
                <Qty>1</Qty>
            </Product>
        </Products>
    </Order>
</Orders>

I split the XML with XSLT like this.

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output indent="yes"/>
  <xsl:template match="/">
  <!-- Create an output file per order from the previous query -->
      <xsl:for-each select="Orders/Order/Products/Product">
      <xsl:variable name="InputFile" select="base-uri()"/>
          <xsl:variable name="OutputFile" select="Line_Id"/>
        <xsl:result-document href="{$OutputFile}.xml" method="xml">
                    <xsl:copy-of select="current()"/>
      </xsl:result-document>
    </xsl:for-each>
  </xsl:template>
</xsl:stylesheet>

This works good and I get new XML files like this

File_1:

<Product>
    <Line_Id>1</Line_Id>
    <Name>My-Love</Name>
    <Product_Id>7978</Product_Id>
    <Product_Variation>A4</Product_Variation>
    <Variation_Id>0</Variation_Id>
    <Qty>1</Qty>
</Product>

File_2:

<Product>
    <Line_Id>2</Line_Id>
    <Name>Other</Name>
    <Product_Id>7697</Product_Id>
    <Product_Variation>A5</Product_Variation>
    <Variation_Id>0</Variation_Id>
    <Qty>1</Qty>
</Product>

But my problem is that when I split the XML I also want to pick up the value in the tag and put it last in tag with a space in the splitted XML-file.

The splitted files should be like this (see the Name and Variation tag):

File_1:

<Product>
    <Line_Id>1</Line_Id>
    <Name>My-Love A4</Name>
    <Product_Id>7978</Product_Id>
    <Product_Variation>A4</Product_Variation>
    <Variation_Id>0</Variation_Id>
    <Qty>1</Qty>
</Product>

File_2:

<Product>
    <Line_Id>2</Line_Id>
    <Name>Other A5</Name>
    <Product_Id>7697</Product_Id>
    <Product_Variation>A5</Product_Variation>
    <Variation_Id>0</Variation_Id>
    <Qty>1</Qty>
</Product>  

Answer 1

Instead of using xsl:copy-of , use xsl:apply-templates , then have a template matching name to perform the relevant transformation, and the identity template to copy across all other nodes:

Try this XSLT

<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output indent="yes"/>

  <xsl:template match="/">
  <!-- Create an output file per order from the previous query -->
    <xsl:for-each select="Orders/Order/Products/Product">
      <xsl:variable name="InputFile" select="base-uri()"/>
      <xsl:variable name="OutputFile" select="Line_Id"/>
      <xsl:result-document href="{$OutputFile}.xml" method="xml">
        <xsl:apply-templates select="current()"/>
      </xsl:result-document>
    </xsl:for-each>
  </xsl:template>

  <xsl:template match="@*|node()">
    <xsl:copy>
      <xsl:apply-templates select="@*|node()" />
    </xsl:copy>
  </xsl:template>

  <xsl:template match="Name">
    <xsl:copy>
      <xsl:value-of select="concat(., ' ', ../Product_Variation)" />
    </xsl:copy>
  </xsl:template>
</xsl:stylesheet>

See it in action at http://xsltfiddle.liberty-development.net/gWvjQfn (although I have changed xsl:result-document to just a normal result-document element as xsltfiddle will disable the usage of xsl:result-document ).