Package org.rcsb.cif.schema.mm

Class SpaceGroup

java.lang.Object
org.rcsb.cif.schema.DelegatingCategory
org.rcsb.cif.schema.mm.SpaceGroup
All Implemented Interfaces:
Category
@Generated("org.rcsb.cif.schema.generator.SchemaGenerator")
public class SpaceGroup
extends DelegatingCategory
Contains all the data items that refer to the space group as a whole, such as its name or crystal system. They may be looped, for example, in a list of space groups and their properties. Only a subset of the SPACE_GROUP category items appear in this dictionary. The remainder are found in the symmetry CIF dictionary. Space-group types are identified by their number as given in International Tables for Crystallography Vol. A. Specific settings of the space groups can be identified either by their Hall symbol or by specifying their symmetry operations. The commonly used Hermann-Mauguin symbol determines the space-group type uniquely but several different Hermann-Mauguin symbols may refer to the same space-group type. A Hermann-Mauguin symbol contains information on the choice of the basis, but not on the choice of origin. Different formats for the Hermann-Mauguin symbol are found in the symmetry CIF dictionary.

  • Constructor Details

  • Method Details

    • createDelegate

      protected Column createDelegate​(String columnName, Column column)
      Overrides:
      createDelegate in class DelegatingCategory

    • getCrystalSystem

      public StrColumn getCrystalSystem()
      The name of the system of geometric crystal classes of space groups (crystal system) to which the space group belongs. Note that rhombohedral space groups belong to the trigonal system.
      Returns:
      StrColumn

    • getId

      public StrColumn getId()
      This is the unique identifier for the SPACE_GROUP category.
      Returns:
      StrColumn

    • getITNumber

      public IntColumn getITNumber()
      The number as assigned in International Tables for Crystallography Vol. A, specifying the proper affine class (i.e. the orientation-preserving affine class) of space groups (crystallographic space-group type) to which the space group belongs. This number defines the space-group type but not the coordinate system in which it is expressed.
      Returns:
      IntColumn

    • getNameHall

      public StrColumn getNameHall()
      Space-group symbol defined by Hall. Each component of the space-group name is separated by a space or an underscore. The use of a space is strongly recommended. The underscore is only retained because it was used in old CIFs. It should not be used in new CIFs. _space_group.name_Hall uniquely defines the space group and its reference to a particular coordinate system. Ref: Hall, S. R. (1981). Acta Cryst. A37, 517-525; erratum (1981), A37, 921. [See also International Tables for Crystallography Vol. B (2001), Chapter 1.4, Appendix 1.4.2.]
      Returns:
      StrColumn

    • getNameH_MAlt

      public StrColumn getNameH_MAlt()
      _space_group.name_H-M_alt allows any Hermann-Mauguin symbol to be given. The way in which this item is used is determined by the user and in general is not intended to be interpreted by computer. It may, for example, be used to give one of the extended Hermann-Mauguin symbols given in Table 4.3.2.1 of International Tables for Crystallography Vol. A (2002) or a Hermann-Mauguin symbol for a conventional or unconventional setting. Each component of the space-group name is separated by a space or an underscore. The use of a space is strongly recommended. The underscore is only retained because it was used in old CIFs. It should not be used in new CIFs. Subscripts should appear without special symbols. Bars should be given as negative signs before the numbers to which they apply. The commonly used Hermann-Mauguin symbol determines the space- group type uniquely but a given space-group type may be described by more than one Hermann-Mauguin symbol. The space- group type is best described using _space_group.IT_number. The Hermann-Mauguin symbol may contain information on the choice of basis, but not on the choice of origin. To define the setting uniquely, use _space_group.name_Hall or list the symmetry operations.
      Returns:
      StrColumn