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These items are used in the construction of CDEs based on the ISO/IEC 11179 Metamodel for data specification. The structure of these linkages are as follows: 

• A Data Element is composed of a Data Element Concept (DEC) and a Value Domain (VD). 
• A DEC is composed of an Object Class and a Property. 
• A VD can be enumerated or enumerated. When enumerated it is composed of one or more sets/pairs of Permissible Values (PV) and Value Meanings (VM).

Since Concept linkages can be found in the Property, Object Class, or Value Meanings, it is possible to retrieve all caDSR content based on Concept information, most typically one of the following:

• The concept unique identifier, which is stored in the Concept Preferred Name, or

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• The Concept Name, stored in the Concept Long Name.

To find any content in caDSR based on a related concept, it is necessary to find the concept of interest and navigate the path to all its related caDSR items.

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