2392 ISDOC Information System Document 5.x Text (Mark-up) ISDOC is a type of Extensible Markup Language (XML) file format specific for transfer of financial documents. It allows paperless exchanging of invoices and other documents, processing and portability among companies, public administration authorities and individuals. It was defined by “A Working group for Electronic Standards of data exchanging” in ICT Union (formerly SPIS). The “Declaration on common approach in the area of electronic invoicing in the Czech Republic” was signed on 16th October 2008. It represents a Czech customization of UBL standard https://www.iso.org/standard/66370.html. ISDOC file enables enveloped signatures including advanced IETF/W3C XML digital signatures conforming to the ETSI XAdES specification. This signiture records a general ISDOC file format, however there are several versions of this format which can be found here: http://www.isdoc.cz/index.php?id=1316. 242 The National Archives of the Czech Republic / The National Archives of the Czech Republic 06 Dec 2021 11/2023 (v.115)- Max-offset modified for BOF signature to allow for more exact signature identification. Removed '(Generic)' from file format name to reflect version number. Internally researched 14 Nov 2023 fmt/1567 PUID isdoc File extension 1909 ISDOC Information System Document 5.x BOF; Offset: 16-300; Magic bytes: 'isdoc.cz' 1 Absolute from BOF 16 284 6973646F632E637A Has lower priority than 2393 ISDOCX Information System Document Has lower priority than 2395 ISDOC Information System Document Has priority over 638 Extensible Markup Language Is previous version of 2395 ISDOC Information System Document Is subtype of 2393 ISDOCX Information System Document