PDF files (Portable Document Format) is a file format created by Adobe Systems for document exchange. Formerly a proprietary format, PDF was officially released as an open standard on July 1, 2008, and published by the International Organization for Standardization as ISO/IEC 32000-1:2008. Babelway enables to publish outgoing document in PDF format. It is possible to include an electronic signature to the PDF. It is also possible to attach other files formats such as EDI, XML or flat files to a PDF message. This is particularly useful in the sending of electronic invoices in both a human-friendly format (PDF) and machine-friendly format (structure file).