Attach a ZUGFeRD file.
Child elements: (none)
Textual description of the attached file (for the PDF viewer).
The name of the local file to be attached to the PDF.
The type of the included file. Currently only ZUGFeRD is supported.
The attached file is an XML file containing a ZUGFeRD invoice
<AttachFile filename="invoice.xml" description="A ZUGFeRD invoice." type="ZUGFeRD invoice"/>