Split XSLT Output into Multiple Files

Question

I have an XML-to-File scenario working, but now I need to split my XSLT map output into multiple files based on the data.  I have been reading the Jin Shin blog on message splitting, but don't know that it pertains to my situation.
XML data getting mapped with XSLT map creates output formatted like this.
<?xml version="1.0" encoding="utf-8"?>
<ns1:ColdInvoiceData xmlns:ns1="http://graybar.com/cold/invoice">
<Header>
  <RecordID>HDR</RecordID>
  <InvoiceNumber>15</InvoiceNumber>
</Header>
<Details>
  <RecordID>DTL</RecordID>
  <LineItemNumber>001</LineItemNumber>
  <UnitPrice>1.25</UnitPrice>
</Details>
<Details>
  <RecordID>DTL</RecordID>
  <LineItemNumber>002</LineItemNumber>
  <UnitPrice>2.22</UnitPrice>
</Details>
<Header>
  <RecordID>HDR</RecordID>
  <InvoiceNumber>16</InvoiceNumber>
</Header>
<Details>
  <RecordID>DTL</RecordID>
  <LineItemNumber>001</LineItemNumber>
  <UnitPrice>3.33</UnitPrice>
</Details>
</ns1:ColdInvoiceData>
I currently have this output writing to a file (FTP, File Conversion).  A single file is no issue, but I need to send multiple files for every set of HDR/DTL(s).  I also need to put the invoice number in the filename (which is working fine as a parameter in my single FTP File CC now).
Can I make this happen with message splitting and maybe a second map (GUI map)?  Do I need to adjust the XSLT output XML format to have an invoice level?  Is there a better way to go?
Thanks!

Answer 1

I made a change to the namespace used on the Messages/Message1 nodes (since the system-assigned ns0 was already being used in my xml data) and now I am getting output. 
The problem is that the output matches my input.  As aforementioned, I started with just a one-to-one mapping on every node and field. 
When I change the mapping to try to force multiple ColdInvoiceData nodes, I get the following error (when my source has two Invoice nodes):
<Trace level="1" type="T">com.sap.aii.utilxi.misc.api.BaseRuntimeException: RuntimeException in Message-Mapping transformation: Cannot produce target element /ns0:Messages/ns0:Message1/ns1:ColdInvoiceData[2]/Invoice. Check xml instance is valid for source xsd and target-field mapping fulfills requirements of target xsd at
When my source has one invoice node, it works ok.
Here is a screenshot of my mapping structure.
http://webpages.charter.net/kpwendel2/ib.jpg