HL7所有的DataType.doc

? Table 1: Overview of HL7 version 3 data types Name Symbol Description DataValue ANY Defines the basic properties of every data value. This is an abstract type, meaning that no value can be just a data value without belonging to any concrete type. Every concrete type is a specialization of this general abstract DataValue type. Boolean BL BL stands for the values of two-valued logic. A BL value can be either true or false, or, as any other value may be NULL. BooleanNonNull BN BN constrains the boolean type so that the value may not be NULL. This type is created for use within the data types specification where it is not appropriate for a null value to be used Encapsulated Data ED Data that is primarily intended for human interpretation or for further machine processing outside the scope of HL7. This includes unformatted or formatted written language, multimedia data, or structured information in as defined by a different standard (e.g., XML-signatures.) Instead of the data itself, an ED may contain only a reference (see TEL.) Note that ST is a specialization of the ED where the mediaType is fixed to text/plain. Character String ST The character string data type stands for text data, primarily intended for machine processing (e.g., sorting, querying, indexing, etc.) Used for names, symbols, and formal expressions. Concept Descriptor CD A CD represents any kind of concept usually by giving a code defined in a code system. A CD can contain the original text or phrase that served as the basis of the coding and one or more translations into different coding systems. A CD can also contain qualifiers to describe, e.g., the concept of a left foot as a postcoordinated term built from the primary code FOOT and the qualifier LEFT. In cases of an exceptional value, the CD need not contain a code but only the original text describing that concept. Coded Simple Value CS Coded data in its simplest form, where only the code is not predetermined. The code system and c