Standard for Data Dictionaries for Intelligent Transportation Systems
|Publication Date:||26 June 1999|
At the 1996 Intelligent Transportation Systems (ITS) America Annual Meeting, a survey was taken to determine ITS standards needs. Among the highest priorities of the ITS America membership and the other standards developing organizations' membership were data dictionaries and an ITS data dictionary standard. The Federal Highway Administration (FHWA) Joint Program Office for ITS established a "cooperative agreement" with the IEEE to expedite the development of ITS standards by supplementing the voluntary committee efforts with funding to hire subject matter technical experts. ITS America formed a Data Dictionary Task Force, composed of functional-area data dictionary working group leaders, to define the general requirements for a data dictionary standard. The result is a standard based on ISO/IEC 11179 (see [B21]-[B26])1 , with mandatory attributes that will facilitate interchange of data between ITS functional areas.
IEEE Standards Coordinating Committee 32 (SCC 32) formed a working group to develop this ITS data dictionary standard and a complementary message standard. The working group first met in November 1996, at IEEE headquarters in Piscataway, N.J. Significantly, the first item of business was to define the goal of the working group and the standards it was to develop. This goal was articulated as the unambiguous interchange and reuse of data and information between the various ITS functional subsystems. It was recognized that ISO/IEC 11179 (see [B21]-[B26]) forms a basis for the data elements, but that additional efforts beyond ISO/IEC 11179 (see [B21]-[B26]) were required to achieve the goal of unambiguous data interchange.
The working group realized that this standard alone would not achieve the goal of unambiguous interchange and reuse of data among functional areas of ITS. The working group defined the requirements for an ITS data registry as a particular kind of data dictionary. The ITS data registry is to be a logically centralized repository for all ITS data elements and other data concepts that have been formally specified and established for use within the ITS domain. The purpose of the ITS data registry is to support the unambiguous definition and reuse of data among functional-areas of ITS (i.e., among associated ITS subsystems and their application systems). Other standards define how the contents of a data registry are unambiguously interchanged. The ITS data registry is addressed by part 2 of this standard. The additional effort of establishing and operating an ITS data registry is out of the scope of this working group.
This standard addresses the concepts of data dictionaries as applied to Intelligent Transportation Systems (ITS), an underlying framework to support the concepts, and the set of data concepts and meta-attributes used to describe, standardize, and manage the contents of such data dictionaries. Various annexes also provide specifications for ITS naming requirements; standard ITS value domains and representation class terms; and a classification scheme for organizing ITS data dictionary contents.