Did you read already the Documentation? It contains a really quick documentation of how to create the template files.
I'll take a look into my work laptop later if I have any links/ documents there. Creating the PDF templates is really straight forward. All you need to do is
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create a new "slide show" with the Open Office Impress or Lotus Symphony Presentation application
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add the graphics, texts etc to your
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add the fields and give them unique name(s)
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export the file as a PDF file
That's it.