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Groups of reflections
Hall, S. R., Fitzgerald, P. M. D. and McMahon, B.  International Tables for Crystallography (2006). Vol. G, Section 3.2.3.2.2, pp. 101-102 [ doi:10.1107/97809553602060000734 ]
Groups of reflections 3.2.3.2.2. Groups of reflections The data items in these categories are as follows: (a) REFLNS (b) REFLNS_CLASS (c) REFLNS_SCALE (d) REFLNS_SHELL The bullet () indicates a category key. Where multiple items within a category are marked with a bullet, they must be taken together to form ...
     [more results from section 3.2.3 in volume G]

Experimental measurements on the crystal
Hall, S. R., Fitzgerald, P. M. D. and McMahon, B.  International Tables for Crystallography (2006). Vol. G, Section 3.2.2.3, pp. 97-98 [ doi:10.1107/97809553602060000734 ]
Experimental measurements on the crystal 3.2.2.3. Experimental measurements on the crystal The categories describing experimental conditions are as follows: EXPTL group EXPTL EXPTL_CRYSTAL EXPTL_CRYSTAL_FACE The data items in these categories are as follows: (a) EXPTL (b) EXPTL_CRYSTAL (c) EXPTL_CRYSTAL_FACE The bullet () indicates a category key. ...
     [more results from section 3.2.2 in volume G]

Introduction
Hall, S. R., Fitzgerald, P. M. D. and McMahon, B.  International Tables for Crystallography (2006). Vol. G, Section 3.2.1, p. 92 [ doi:10.1107/97809553602060000734 ]
Introduction 3.2.1. Introduction This chapter is concerned with the classification and organization of data items defined in the core CIF dictionary (Chapter 4.1 ). The core dictionary, as its name suggests, is central to the definition of data items found in most CIFs. It defines the measured and derived items common ...

Classification and use of core data
Hall, S. R., Fitzgerald, P. M. D. and McMahon, B.  International Tables for Crystallography (2006). Vol. G, ch. 3.2, pp. 92-116 [ doi:10.1107/97809553602060000734 ]
... variety of `residual structure-factor difference measures', referred to as R factors, are used in crystallography as indicators of refinement quality. ... CIF dictionary contains definitions for the three most commonly used R factors. The `conventional R factor' is defined aswhere and are the measured and ...

DICTIONARY_HISTORY
Westbrook, J. D., Berman, H. M. and Hall, S. R.  International Tables for Crystallography (2006). Vol. G, Section 2.6.6.4.4, p. 70 [ doi:10.1107/97809553602060000732 ]
DICTIONARY_HISTORY 2.6.6.4.4. DICTIONARY_HISTORY The DICTIONARY_HISTORY category holds the revision history for a dictionary. Each revision is assigned a version identifier that acts as the key item for the category. Along with the version information, a text description of the revision and date of revision must be specified. References ...
     [more results from section 2.6.6 in volume G]

DDL2 dictionary applications
Westbrook, J. D., Berman, H. M. and Hall, S. R.  International Tables for Crystallography (2006). Vol. G, Section 2.6.5, pp. 63-66 [ doi:10.1107/97809553602060000732 ]
DDL2 dictionary applications 2.6.5. DDL2 dictionary applications In this section, several examples are presented which illustrate how the elements of the DDL are used to build dictionary definitions. Example 2.6.5.1 shows the definition of the _citation.journal_abbrev data item from the mmCIF dictionary. The category ITEM_DESCRIPTION holds a text description ...

DDL2 organization
Westbrook, J. D., Berman, H. M. and Hall, S. R.  International Tables for Crystallography (2006). Vol. G, Section 2.6.4, p. 63 [ doi:10.1107/97809553602060000732 ]
DDL2 organization 2.6.4. DDL2 organization Figs 2.6.4.1-2.6.4.3 provide schematic illustrations of the definitional features provided by DDL2. These figures represent the elements of the DDL in terms of its own language constructs (i.e. categories and the relationships between attributes within those categories). This self-defining presentation has the important ...

Overview of the elements of DDL2
Westbrook, J. D., Berman, H. M. and Hall, S. R.  International Tables for Crystallography (2006). Vol. G, Section 2.6.3, p. 62 [ doi:10.1107/97809553602060000732 ]
Overview of the elements of DDL2 2.6.3. Overview of the elements of DDL2 The elements of DDL2 provide the organizational framework for building data dictionaries like mmCIF. The role of the DDL is to define which data items may be used to construct the definitions in the data dictionary, and also ...

The DDL2 presentation
Westbrook, J. D., Berman, H. M. and Hall, S. R.  International Tables for Crystallography (2006). Vol. G, Section 2.6.2, p. 61 [ doi:10.1107/97809553602060000732 ]
The DDL2 presentation 2.6.2. The DDL2 presentation The syntax used in mmCIF data files and DDL2 dictionaries is a subset of the STAR syntax. Definitions in DDL2 dictionaries are encapsulated in named save frames (see Chapter 2.1 for a description of the STAR File syntax). A save frame is a ...

Introduction
Westbrook, J. D., Berman, H. M. and Hall, S. R.  International Tables for Crystallography (2006). Vol. G, Section 2.6.1, p. 61 [ 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 ...

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