Data Item _space_group.name_H-M_alt


Item name
Category name
Attribute name
Required in PDB entries
Used in current PDB entries
Yes, in about 3.1 % of entries

Item Description

_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 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.

Item Example

                                    'C m c m'
                                    'C 2/c 2/m 21/m'
                                    'A m a m'

Data Type

Data type code
Data type detail
char item types / multi-word items ...
Primitive data type code
Regular expression
[][ \t_(),.;:"&<>/\{}'`~!@#$%?+=*A-Za-z0-9|^-]*


Alias Item Name Dictionary Name Dictionary Version
_space_group_name_H-M_alt cif_core.dic 2.3