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XMDF (eXtensible Model Data Format) is a library providing a standard format for the geometric data storage of river cross-sections, 2D/ 3D structured and unstructured meshes, geometric paths through space, and associated time data. XMDF uses HDF5 for cross-platform data storage and compression. It was initiated in Engineer Research and Development Center ( ERDC) and developed at Brigham Young University. API includes interfaces for C/ C++ and Fortran.

An overview of the format was published by the ERDC in 2007. A binary format was chosen for the data in order to improve performance and data storage as compared with more traditional ASCII grids. The group considered both the NetCDF and HDF5 data formats, and chose HDF5 because it has more flexibility for data storage, compression and data mining. It also supports data folders and data structures, making it more customizable.

The modeling format is used by hydrologic modeling software such as TUFLOW.

XMDF (E-book format)

XMDF (ever-eXtending Mobile Document Format) is a file format for viewing electronic books. It was originally developed by Sharp Corporation for its Zaurus platform. It is primarily used in Japan.