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. 67
Section 2.6.6.1.11. ITEM_RELATED
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 |
The ITEM_RELATED category describes specific relationships that exist between data items. These relationships are distinct from the parent–child relationships that are expressed in the category. The related item is identified as the item _item_related.related_name that is a child of _item.name.
Item relationships defined by _item_related.function_code in this category include some of the following (Table 2.6.5.1): an item is related to another item by a conversion factor; an item is a replacement for another item; an item is replaced by another item; an item is an alternative expression of an item; items which differ only in some convention of their expression; and items which express a set of related characteristics. One can also identify whether the declaration of an item is mutually exclusive with its alternative item. Multiple related items can be associated with each data item and multiple relationship codes can be specified for each related item.