Details about the information content of the data set, including the entity types, their attributes, and the domains from which attribute values may be assigned. Description of the entities, attributes, attribute values, and related characteristics encoded in the data set. The definition and description of a set into which similar entity instances are classified. The name of the entity type. The description of the entity type. The authority of the definition. A defined characteristic of an entity. The name of the attribute. The description of the attribute. The authority of the definition. The valid values that can be assigned for an attribute. The members of an established set of valid values. The name or label of a member of the set. The description of the value. The authority of the definition. The minimum and maximum values of a continuum of valid values. The least value that the attribute can be assigned. The greatest value that the attribute can be assigned. The standard of measurement for an attribute value. The smallest unit increment to which an attribute value is measured. Reference to a standard or list which contains the members of an established set of valid values. The title of the codeset. The authority for the codeset. Description of the values and reasons why they cannot be represented. Earliest or only date for which the attribute values are current. In cases when a range of dates are provided, this is the earliest date for which the information is valid. Latest date for which the information is current. Used in cases when a range of dates are provided. An assessment of the accuracy of the assignment of attribute values. An estimate of the accuracy of the assignment of attribute values. The definition of the Attribute Value Accuracy measure and units, and a description of how the estimate was derived. The frequency with which attribute values are added. Summary of, and citation to detailed description of, the information content of the data set. Detailed summary of the information contained in a data set. Reference to the complete description of the entity types, attributes, and attribute values for the data set.