The ISO/IEC 29500-2 and the standard ECMA-376[10], Information technology - Document description and processing languages - Office Open XML File Formats - Part 2: Open Packaging Conventions describes the Open Packaging Convention (OPC) format. The OPC standard can be considered a modern version of the TAR format: it combines a ZIP compression of the parts composing the package (respecting a directory structure) along with XML documents that describe the package content (that can be used to store the OAIS descriptive information), the web media types present in the package, the relations between the parts composing the package and a quicklook of the data inside. It was initially designed as a package for the MicroSoft office packaged documents (docx, xlsx, etc) but is now used by other software companies to support their multipart formats (see a list of formats in the wikipedia page) including two GIS brands such as Autodesk AutoCAD (for a Design Web Format (DWFx) file format) and MiraMon (for its open compressed map (MMZx) file format).