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![[Figure 2]](gl0546fig2mag.jpg)
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Figure 2
A schematic representation of the mmCIF categories describing linkages between chemical components. In this figure, boxes enclose the mmCIF categories. The upper portion of each box identifies the category and the lower portion contains a list of the data items within the category. Data items that are preceded by a solid circle are the key data items which uniquely identify each row of data within the category. For those data items which occur in multiple categories the arrows point at the location of the parent definition of the data item. Complete definitions and examples of each of these data items can be found in the mmCIF dictionary (Fitzgerald et al., 1997  ). |
![[Figure 2]](gl0546fig2.jpg)
 | JOURNAL OF APPLIED CRYSTALLOGRAPHY |
ISSN: 1600-5767
