CorrespondenceType
------------------

Describes the commonalities and differences between two items using a textual description of both commonalities and differences plus an optional coding of the type of commonality, a commonality expresses as a 0 to 1 weighting factor (expressing degree of comparability) and a user defined correspondence property which is specific to an organization or community of use.

Properties
~~~~~~~~~~

.. csv-table::
   :header: "Name","Type","","Description"
   :widths: 15,10,5,100

   "Commonality",":doc:`/composite-types/StructuredStringType/index`","0..1","Common features of the compared objects.  Supports multiple language versions of the same content as well as optional formatting of the content."
   "Difference",":doc:`/composite-types/StructuredStringType/index`","0..1","Description of the difference between the compared objects.  Supports multiple language versions of the same content as well as optional formatting of the content."
   "CommonalityTypeCoded",":doc:`/composite-types/CodeValueType/index`","0..1","A brief description describing the commonality of the two schemes/items, i.e., ""Identical"", ""High"", ""Medium"", ""Low"", ""None"". Supports the use of an external controlled vocabulary. The DDI Alliance has provided a controlled vocabulary (CommonalityType) to support this element at http://www.ddialliance.org/controlled-vocabularies."
   "CommonalityWeight","float","0..1","A value between 0 and 1 expressing the degree of commonality (0 indicates none, 1 indicates that they are identical)."
   "UserDefinedCorrespondenceProperty",":doc:`/composite-types/StandardKeyValuePairType/index`","0..n","An alternate means of expressing commonality within a specific system. A system specific user defined correspondence expressed as a key/value pair. As this is specific to an individual system the use of controlled vocabularies for the key is strongly recommended."


Relationships
~~~~~~~~~~~~~
The following types reference this type.

* :doc:`/item-types/GenericMap/index`
* :doc:`/item-types/RepresentationMap/index`
* :doc:`/composite-types/ItemMapType/index`

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