ExternalCategoryRepresentationBaseType
--------------------------------------

Structures a response domain based on categorization that is described in an external non-DDI structure. Includes a UsageDescription that should provide information on how the external source is to be used.

Properties
~~~~~~~~~~

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

   "ExternalCategoryReference","anyURI","0..1","References an external, non DDI category. This is the element to use if the Code Scheme being used is not in DDI and cannot be used directly. It provides for both the reference and an explanation of how to use the information accurately within a DDI context."
   "UsageDescription",":doc:`/composite-types/StructuredStringType/index`","0..1","A description of the use of the external category file. Supports multiple language versions of the same content as well as optional formatting of the content."

Properties Inherited from RepresentationType
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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

   "RecommendedDataType",":doc:`/composite-types/CodeValueType/index`","0..1","This field provides the recommended treatment of the data within an application. The value should come from a controlled vocabulary - recommended values include the set found in W3C XML Schema Part 2, but excluding string sub-types, QNAME, and NOTATION. The DDI Alliance has provided a controlled vocabulary (DataType) to support this element at http://www.ddialliance.org/controlled-vocabularies."
   "GenericOutputFormat",":doc:`/composite-types/CodeValueType/index`","0..1","This field provides a recommended generic treatment of the data for display by an application. The value should come from a controlled vocabulary."
   "MeasurementUnit",":doc:`/composite-types/CodeValueType/index`","0..1","Records the measurement unit, for example, 'km', 'miles', etc. Supports the use of a controlled vocabulary."
   "MissingValue","string","0..1","List the values used to represent missing data in a space delimited array. Use of MissingValuesReference is preferred. If this content does not match the values provided in the MissingValuesReference, the content of the MissingValuesReference overrides the content of this attribute."
   "BlankIsMissingValue","boolean","0..1","When value is true a blank or empty variable content should be treated as a missing value.  Use of MissingValuesReference is preferred."
   "ClassificationLevel","string","0..1","Indicates the type of relationship, nominal, ordinal, interval, ratio, or continuous. Use where appropriate for the representation type."


Item Type Hierarchy
~~~~~~~~~~~~~~~~~~~

* :doc:`/composite-types/RepresentationType/index`
    * **ExternalCategoryRepresentationBaseType**


Relationships
~~~~~~~~~~~~~


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.. |stub| image:: ../../images/ExternalCategoryRepresentationBaseType.svg