Creating a New DAL Job
Every DAL job should have the xfj:output element defined to specify the output format. If it's omitted, then the output will be PDF.
This is how the file should look:
<?xml version="1.0" encoding="utf-8"?>
<xfj:job xmlns:xfj="http://www.ecrion.com/xfj/1.0">
<xfj:output mime-type="application/pdf"/>
</xfj:job>
Adding Some Documents
The primary role of DAL is document assembly, so it's only natural that this first example shows how to merge two documents.
The first document is a static PDF file called InputPDF.pdf:

The second is a dynamic document generated from an XML file with an XFD style-sheet: data.xml with InputXFD.xfd. The rendered output looks like this:

We will use an xfj:document for each file. The xfj:external-content of the first document will reference the PDF file and the xfj:apply-local-template of the second document will reference the XFD style-sheet. In addition, the second document will have an xfj:external-content referencing the XML file.
Note that all paths are relative to the DAL job file.
This is the DAL job file:
<?xml version="1.0" encoding="utf-8"?>
<xfj:job xmlns:xfj="http://www.ecrion.com/xfj/1.0">
<xfj:output mime-type="application/pdf"/>
<xfj:document id="doc2" title="Current Superannuation">
<xfj:external-content src="InputPDF.pdf"/>
</xfj:document>
<xfj:document id="doc3" title="Your Funds">
<xfj:apply-local-template src="InputXFD.xfd"/>
<xfj:external-content src="data.xml"/>
</xfj:document>
</xfj:job>
All the files referenced can be found in the XML Samples folder.