Extracting Subset and Modifying Attribute

fauster · September 6th, 2006, 07:50 AM

I am attempting to extract an XML document wrapped in an envelope and modify one tag to include namespace information. Here is a portion of the document:

<gsEnvelope>
  <header>
    <message>
      <messageID>DLOS06959</messageID>
      <arrivalTime>2006-08-25T18:19:05GMT</arrivalTime>
      <subject>Order</subject>
    </message>
    <from>
      <orgID>jmi001</orgID>
      <messageID>84-P17871_119017</messageID>
    </from>
    <to>
      <orgID>aps002</orgID>
    </to>
  </header>
  <body><Order>
      <OrderHeader>
        <OrderNumber>
          <BuyerOrderNumber>123456789</BuyerOrderNumber>
        </OrderNumber>
</Order>
</body>
</gsEnvelope>

How can I extract only the <Order> to </Order> portion of the document(exactly) while altering the Order tag itself to say
<Order xmlns="rrn:org.xcbl:schemas/xcbl/v3_0/xcbl30.xsd">

I keep getting all tags modified when I try to use <xsl:if test="@name = Order"></xsl:if> in concert with <xsl:copy-of select="@*"/>.

I am very new to this.
I am attempting to copy

mhkay · September 6th, 2006, 08:41 AM

Changing <Order> to <Order xmlns="rrn:org.xcbl:schemas/xcbl/v3_0/xcbl30.xsd"> is effectively renaming the element, because the element name has two parts, a local part and a namespace URI. I imagine you also want to rename all the children of the Order so they are also in this namespace.

To do this you want a recursive descent template like this:

<xsl:template match="*" mode="rename">
<xsl:element name="{local-name()}" namespace="rrn:org.xcbl:schemas/xcbl/v3_0/xcbl30.xsd">
<xsl:apply-templates mode="rename"/>
</xsl:template>

and then invoke this on the Order that you want to "copy" (it's not actually a copy at all, because you are changing the name of every element).

Note that if you create the elements with the correct names, the namespace declarations will look after themselves.

>I keep getting all tags modified when I try to use <xsl:if test="@name = Order"></xsl:if> in concert with <xsl:copy-of select="@*"/>.

You've got me completely puzzled there. Why are you using instructions that refer to attributes when your source document contains no attributes?

Michael Kay
http://www.saxonica.com/
Author, XSLT Programmer's Reference and XPath 2.0 Programmer's Reference