Open-source library for working with:
- crystallographic symmetry,
- macromolecular models (in mmCIF, PDB and mmJSON formats),
- refinement restraints (CIF files),
- crystallographic reflections (MTZ and mmCIF formats),
- data on a 3D grid (electron density maps, masks, MRC/CCP4 format).
The library is accompanied by a set of command-line tools for converting and validating files, and for calculation of various properties and metrics from models, maps and data.