Tables for
Volume G
Definition and exchange of crystallographic data
Edited by S. R. Hall and B. McMahon

International Tables for Crystallography (2006). Vol. G, ch. 2.1, p. 16

Section Global block

S. R. Halla* and N. Spadaccinib

aSchool of Biomedical and Chemical Sciences, University of Western Australia, Crawley, Perth, WA 6009, Australia, and bSchool of Computer Science and Software Engineering, University of Western Australia, 35 Stirling Highway, Crawley, Perth, WA 6009, Australia
Correspondence e-mail: Global block

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A global block is a set of data items which are implied to be present in all data blocks which follow in a file, unless specified explicitly within a data block. A global block starts with a global_ keyword and is closed by a data_blockcode statement or an end of file.

Example: [Scheme scheme13]

information that is default within subsequent
data blocks

[Scheme scheme14]

A global block has the following attributes:

  • (a) The scope of global data is from the point of declaration to the end of file.

  • (b) A global block may contain data items, loop structures and save frames.

  • (c) Multiple global blocks are concatenated to form a single block in which the last item specification has precedence.

  • (d) A data item specified within a data block has precedence over a data item specified in a prior global block.

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