Break a PDF document in two parts through the indicated page.

1 pdf.reader.slice

<pdf.reader.slice page='page'>
    <input_pdf_reader /> ?
</pdf.reader.slice>
Example

Break a PDF document of 10 pages in a document of 4 and another of 6.

Copy
<pdf.reader.slice size='5'>
  <pdf.reader>
    <file type='absolute' name='src_plain.pdf' />
  </pdf.reader>
</pdf.reader.slice>