Hierarchical Data Format
Proprietary legacy format for tabular data.
|related formats||Access, CSV, dbase, SIARD, SQL, XML|
HDF (version 5, not compatible with earlier versions) is a common dataset format with the ability to store data in multidimensional arrays, grouped into collections and/or hierarchies. Relationships between data in the arrays can be saved, but the format does not allow for storing structured (descriptive) metadata.
The format is open and can be read in a variety of applications, but it is very difficult to process without the use of HDF5 software.