![]() ![]() ![]() The IUCr also archives a core set of mmCIF definitions. Macromolecular users should refer to the wwPDB mmCIF website for reference materials and dictionaries. The wwPDB independently maintains a set of dictionaries for describing macromolecular structures and associated experimental measurements. ![]() Modulated and composite structures dictionary (msCIF)ĭescriptors for macromolecular structures and associated experiments The online etymology dictionary (etymonline) is the internets go-to source for quick and reliable accounts of the origin and history of English words.This change over to DDLm does not affect the meaning of datanames used in CIF data files. Please note that most of these dictionaries are in the process of being updated to the new DDLm dictionary language standard. The following dictionaries are maintained by COMCIFS through interactions with the the relevant communities. Descriptors for diffraction techniques and small-molecule, inorganic and other small-unit-cell structures A machine-readable register of CIF dictionaries maintained by the IUCr is available. They include dictionaries that are maintained by COMCIFS, as well as dictionaries maintained by other trusted organisations. The CIF dictionaries listed below belong to a single namespace. Chester: International Union of Crystallography. Definition and exchange of crystallographic data, 1st online ed., ch. International Tables for Crystallography, Vol. General considerations when defining a CIF data item. A candidate data-name definition should fulfil the following conditions: (i) describe a specific and well defined concept: precision of definition is essential for an effective interchange mechanism (ii) have appropriate granularity: data names can define a very small piece of information (a standard uncertainty on a particular physical measurable) or a very large amount (the text of a scientific paper) (iii) have well defined relationships with other data items (through its assigned category membership and parent/child links) (iv) constraints on the data type and permissible values should be provided where applicable (v) the name chosen should be globally unique this is achieved through monitoring of names in public dictionaries by a regulatory committee (COMCIFS) and by registering of prefix strings for exclusive use in local dictionaries. ![]() New entries may be devised for public or private dictionaries. Dictionary entries are constructed in a structured machine-readable manner that facilitates validation and structuring of data. Image used under license from Shutterstock.CIF dictionaries provide a formal taxonomy of crystallographic terms and ideas. Reduce the risk of downstream errors and rework.Ensure agreement between the business-facing content and technical-facing physical data.“Defines the structure of the database itself and is used in database control and maintenance.” ( Business Dictionary).Choose a topic area from the list below to get started. Most importantly this reference guide facilitates communication with business resulting in better understood definitions.” ( Amber Lee Dennis). The definition of Dictionary is a book or digital resource (such as ) containing a selection of words and information about their meanings, pronunciations, etymologies, inflected forms, derived forms, etc., in either the same or another language lexicon glossary. Topic Dictionaries at Oxford Learners Dictionaries Topics Build your topic vocabulary with these mini-dictionaries, which are groups of words related to common subject areas. “An in-house resource with terms in one place.A “collection of names, definitions, and attributes about data elements that are being used or captured in a database.” ( UC Merced Library).A resource providing “the ingredients and steps needed to create relevant business reports.” ( Michelle Knight).It defines the field names, their order, their data type and the byte positions they occupy in the file.” ( IBM Knowledge Center) “A file that defines the format of data in an ASCII flat file.Image Credit: Other Definitions of a Data Dictionary Include: ![]()
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