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The Description file holds that holdsthat describe. A is Ais used to give meaning to a and aand provide well-understood and standard ways of referring to a.

900000000000443000|Module|

138875005|SNOMED CT Concept|

900000000000446008|Description type|

900000000000447004|Case significance|

Only one record onerecord with the same id field will be current at any point in time. The current record will be the one with the most recent effectiveTime (field) before or equal to the point in time under consideration.

If the field thefield of this record is false ('0'), then the is at theisat that point in time. If the field thefield is true ('1'), then the is theis associated with the identified theidentified by the conceptId field.

The conceptId field, the languageCode field and the typeId (field) field will not change between two rows with the same id, in other words they are immutable. Where a change is required to one of these fields, then the current row will be de-activated (by appending a row with the same id and the field thefield set to false) and a new row with a new id will be appended. Only limited changes may be made to the ' term ' field, as defined by editorial rules.

Each will Eachwill have at least one with onewith a typeId (field) of || for a given languageCode (like "en"). Where a only aonly has one with onewith a typeId (field) of || for a given codegivencode, then that can thatcan be taken as the for that and thefor thatand each of its, and need not therefore be explicitly included in for infor that. Where a only aonly has one with onewith a typeId (field) of || across all codes allcodes within a release, then that can thatcan be taken as the for all and thefor alland, and need not therefore be explicitly included in any in anyin that release.

The term (field) field will be restricted as follows:

• to an overall maximum length of 32Kb;

• to a maximum length, configurable for

  each type

  eachtype (as defined by

  the Type member

  theTypemember associated with

  that type

  thattype - see

  the " - Specifications"

  the Description Format Reference Set specifications document for more details

  );

  .

• The format of the term field (plain text, limited HTML, XHTML,) will also be configurable for

  each type

  eachtype, using the same mechanism as above;

• Control characters (including TABs, CRs and LFs) will not appear in |Plain text| and |Limited HTML| format types.

...

• 3.1.2. Descriptions and Terms

• 4.1.12. Description Format Reference Set

• 6. Unicode UTF-8 encoding 3.1.2. Descriptions and Terms

• (Glossary)