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Specification of a relational dictionary definition language (DDL2)
Westbrook, J. D., Berman, H. M. and Hall, S. R.  International Tables for Crystallography (2006). Vol. G, ch. 2.6, pp. 61-70 [ doi:10.1107/97809553602060000732 ]
... language version 2 (DDL2) presented here extends the DDL1 version (Hall & Cook, 1995) currently used by the IUCr for the description ... 1994. This approach, which later became known as DDL2 (Westbrook & Hall, 1995), employs a largely relational data model that adhered more ... of the Self-defining Text Archive and Retrieval (STAR) File (Hall, 1991; Hall & Spadaccini, 1994). Although DDL2 uses a ...

Dictionary registration attributes
Hall, S. R. and Cook, A. P. F.  International Tables for Crystallography (2006). Vol. G, Section 2.5.6.5, p. 60 [ doi:10.1107/97809553602060000731 ]
Dictionary registration attributes 2.5.6.5. Dictionary registration attributes This class of attributes is used to register the dictionary version and audit information. They are Dictionary attributes are used to record the creation and update history of a dictionary. The attribute _dictionary_history specifies the entry and update information of the dictionary, and ...
     [more results from section 2.5.6 in volume G]

Definition example 9: enumeration states
Hall, S. R. and Cook, A. P. F.  International Tables for Crystallography (2006). Vol. G, Section 2.5.5.9, p. 57 [ doi:10.1107/97809553602060000731 ]
Definition example 9: enumeration states 2.5.5.9. Definition example 9: enumeration states The last example, in Fig. 2.5.5.9, shows the definition of an item whose value is restricted to a predictable set of values known as enumeration states. The attributes _enumeration and _enumeration_detail are used to specify which enumeration states are ...
     [more results from section 2.5.5 in volume G]

DDL versions
Hall, S. R. and Cook, A. P. F.  International Tables for Crystallography (2006). Vol. G, Section 2.5.4, pp. 54-55 [ doi:10.1107/97809553602060000731 ]
... to compile a dictionary of `core structural' crystallographic data items (Hall et al., 1991). These data items were intended for ... are). The `core' DDL is known commonly as DDL1 (Hall & Cook, 1995). Several years later, the definition of macromolecular ... structural entities, and an `mmCIF' DDL, known as DDL2 (Westbrook & Hall, 1995), was developed. DDL2 was used to build the ...

Example 2: attributes of Miller indices
Hall, S. R. and Cook, A. P. F.  International Tables for Crystallography (2006). Vol. G, Section 2.5.3.2, p. 54 [ doi:10.1107/97809553602060000731 ]
Example 2: attributes of Miller indices 2.5.3.2. Example 2: attributes of Miller indices Knowing the inter-dependency of one data item on another plays a major role in the understanding and validation of data. If a triplet of numbers 5, 3, 0 is identified as Miller indices h, k, l, one ...
     [more results from section 2.5.3 in volume G]

The organization of a CIF dictionary
Hall, S. R. and Cook, A. P. F.  International Tables for Crystallography (2006). Vol. G, Section 2.5.2, pp. 53-54 [ doi:10.1107/97809553602060000731 ]
... N. W. (1992). Object oriented databases. New York: Prentice Hall. Kim, W. (1990). Introduction to object oriented databases. Boston ...

The concept of a dictionary definition language (DDL)
Hall, S. R. and Cook, A. P. F.  International Tables for Crystallography (2006). Vol. G, Section 2.5.1.1, p. 53 [ doi:10.1107/97809553602060000731 ]
The concept of a dictionary definition language (DDL) 2.5.1.1. The concept of a dictionary definition language (DDL) The structure or arrangement of data in a CIF is well understood and predictable because the CIF syntax may be specified succinctly (see Chapter 2.2 for CIF syntax expressed using extended Backus-Naur form ...
     [more results from section 2.5.1 in volume G]

Specification of the core CIF dictionary definition language (DDL1)
Hall, S. R. and Cook, A. P. F.  International Tables for Crystallography (2006). Vol. G, ch. 2.5, pp. 53-60 [ doi:10.1107/97809553602060000731 ]
... 2.2 is based on the STAR File universal data language (Hall, 1991; Hall & Spadaccini, 1994) detailed in Chapter 2.1 . An important advantage ... to compile a dictionary of `core structural' crystallographic data items (Hall et al., 1991). These data items were intended ...

Conclusion
Allen, F. H., Barnard, J. M., Cook, A. P. F. and Hall, S. R.  International Tables for Crystallography (2006). Vol. G, Section 2.4.10, p. 51 [ doi:10.1107/97809553602060000730 ]
Conclusion 2.4.10. Conclusion The present proliferation of formats for chemical applications tends to inhibit and complicate the exchange and use of chemical data. Many widely used chemical formats have a finite half-life because they are inflexible and not readily extensible. Others offer universality [e.g. Abstract Syntax Notation 1 (ISO, 2002a ...

MIF query applications
Allen, F. H., Barnard, J. M., Cook, A. P. F. and Hall, S. R.  International Tables for Crystallography (2006). Vol. G, Section 2.4.9, pp. 50-51 [ doi:10.1107/97809553602060000730 ]
... attached hydrogen atom, and at atom 5, which can be S or O. The conjugated multiple C-C bond (3-4 ...

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