Crystallographic Information Framework

[CIF logo]

Index

Image dictionary (imgCIF)

Extended data types

The following extended data types are defined in this dictionary:

Code Primitive data type Regular expression construct Description
 
code char [_,.;:"&<>()/\{}'`~!@#$%A-Za-z0-9*|+-]* code item types/single words ...
ucode uchar [_,.;:"&<>()/\{}'`~!@#$%A-Za-z0-9*|+-]* code item types/single words (case insensitive) ...
line char [][ \t_(),.;:"&<>/\{}'`~!@#$%?+=*A-Za-z0-9|^-]* char item types / multi-word items ...
uline uchar [][ \t_(),.;:"&<>/\{}'`~!@#$%?+=*A-Za-z0-9|^-]* char item types / multi-word items (case insensitive)...
text char [][ \n\t()_,.;:"&<>/\{}'`~!@#$%?+=*A-Za-z0-9|^-]* text item types / multi-line text ...
binary char \n--CIF-BINARY-FORMAT-SECTION--\n\ [][ \n\t()_,.;:"&<>/\{}'`~!@#$%?+=*A-Za-z0-9|^-]*\ \n--CIF-BINARY-FORMAT-SECTION---- binary items are presented as MIME-like ascii-encoded sections in an imgCIF. In a CBF, raw octet streams are used to convey the same information.
int numb -?[0-9]+ int item types are the subset of numbers that are the negative or positive integers.
float numb -?(([0-9]+)[.]?|([0-9]*[.][0-9]+))([(][0-9]+[)])?([eE][+-]?[0-9]+)? float item types are the subset of numbers that are the floating numbers.
any char .* A catch all for items that may take any form...
yyyy-mm-dd char \ [0-9]?[0-9]?[0-9][0-9]-[0-9]?[0-9]-[0-9][0-9]\ (T[0-2][0-9]:[0-5][0-9]:[0-5][0-9](.[0-9]+)([+-][0-5][0-9]:[0-5][0-9]))? Standard format for CIF date and time strings (see http://www.iucr.org/iucr-top/cif/spec/datetime.html), consisting of a yyyy-mm-dd date optionally followed by the character "T" followed by a 24-hour clock time, optionally followed by a signed time-zone offset. The IUCr standard has been extended to allow for an optional decimal fraction on the seconds of time. Time is local time if no time-zone offset is given.

International Tables for Crystallography

Volume G: Definition and exchange of crystallographic data

First online edition (2006)

Edited by S. R. Hall and B. McMahon

An essential guide and reference to CIF for programmers, data managers handling crystal-structure information and practising crystallographers.