Hi!

Here is my problem.

I need to convert XML to XML with different structure.
I have the flat structure and i need to build the hierarchy. For example:

<LIST>
<Invoice>
<InvoiceNum>1</InvoiceNum>
<Delivery>
<DeliveryNum>22<DeliveryNum>
</Delivery>
</Invoice>
<Invoice>
<InvoiceNum>3</InvoiceNum>
<Delivery>
<DeliveryNum>444<DeliveryNum>
</Delivery>
</Invoice>
<Invoice>
</InvoiceNum>
<Delivery>
<DeliveryNum>22<DeliveryNum>
</Delivery>
</Invoice>
</LIST>


If "InvoiceNum" is empty, the "Dlivery" belongs to the previous "Invoice".

How can I add the Delivery to the previous element (Invoice)?

The structure must have this hierarchy:

<LIST>
<Invoice>
<InvoiceNum>1</InvoiceNum>
<Delivery>
<DeliveryNum>22<DeliveryNum>
</Delivery>
</Invoice>
<Invoice>
<InvoiceNum>3</InvoiceNum>
<Delivery>
<DeliveryNum>444<DeliveryNum>
</Delivery>
<Delivery>
<DeliveryNum>22<DeliveryNum>
</Delivery>
</Invoice>
</LIST>





Thanks for help!

I assume that in your example input, </InvoiceNum> is a typo for <InvoiceNum/>.

In XSLT 2.0

<xsl:template match="LIST">
  <xsl:for-each-group group-starting-with="Invoice[InvoiceNum != '']">
    <Invoice>
      <xsl:copy-of select="InvoiceNum"/>
      <xsl:copy-of select="current-group()/Delivery"/>
    </Invoice>
  </
</

In 1.0 (in case you're stuck with it) use sibling recursion. That is, apply-templates to Invoice[1], then in the template for Invoice (a) do an apply-templates to following-sibling::Invoice[1] (in a different mode) provided it has no InvoiceNum, and (b) do an apply-templates (in the original mode) to the first following-sibling::Invoice that does have an InvoiceNum.


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

Thank you Michael!

I'll try to use your example.

I tried to use this code:

<xsl:for-each-group group-starting-with="Invoice[InvoiceNum != '']">
                <Invoice>
                    <xsl:copy-of select="InvoiceNum"/>
                    <xsl:copy-of select="current-group()/Delivery"/>
                </Invoice>
            </xsl:for-each-group>

But I've got the error message: Function current-group does not exist :( What's wrong?
I'am using the Stylus studio 2008.

When using Stylus Studio, check that you have the options set to request an XSLT 2.0 processor (I think Saxon is the only one they support). The error message looks like it comes from a 1.0 processor.

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

Thanks Michael!

But it didn't help :(