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International
Tables for Crystallography Volume G Definition and exchange of crystallographic data Edited by S. R. Hall and B. McMahon © International Union of Crystallography 2006 |
International Tables for Crystallography (2006). Vol. G. ch. 2.6, p. 70
Section 2.6.6.4. DDL2 definitions describing dictionaries and data blocks
a
Protein Data Bank, Research Collaboratory for Structural Bioinformatics, Rutgers, The State University of New Jersey, Department of Chemistry and Chemical Biology, 610 Taylor Road, Piscataway, NJ 08854-8087, USA, and bSchool of Biomedical and Chemical Sciences, University of Western Australia, Crawley, Perth, WA 6009, Australia |
In this section, the DDL categories that describe the characteristics of dictionaries and data blocks are presented. In this context, a dictionary is defined as a group of related definitions within a STAR data block. Fig. 2.6.4.3![[link]](/graphics/greenarr.gif)
illustrates the organization for these categories.
The DATABLOCK category holds the essential identifying information for a data block: the name of the data block, _datablock.id; and a description of the block, _datablock.description. The _datablock.id is the parent identifier for both _category.implicit_key and _dictionary.datablock_id. The former guarantees that the identifier for the data block, and hence the dictionary, is added implicitly to the key of each category.
The DATABLOCK_METHODS category may be associated with a data block. The method identifiers reference the full method definitions in the parent METHOD_LIST category.
The DICTIONARY category holds the essential identifying information for a data dictionary. The items recorded in this category include the title for the dictionary, _dictionary.title, the current version identifier, _dictionary.version, and the data-block identifier in which the dictionary is defined, _dictionary.datablock_id. The version identifier references the parent identifier in the DICTIONARY_HISTORY category in which each dictionary revision is described.
