UNIDOC is an XML-based standard to support electronic data interchange (EDI) in business transactions between trading companies. Unlike other XML-based EDI formats, such as UBL, ebXML, RosettaNet or openTRANS, UNIDOC relies one a single structure ("all in one"). The first idea of such a universal format was published in 2014,[1] its first specification in 2016 in the journal of the Chamber of Commerce and Industry Swabia (Bavaria, Germany).[2] The current specification can be found in the UNIDOC XML Schema Definition.[3]