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| ISO 10303-11 ： ウィキペディア英語版 |
EXPRESS (data modeling language)
EXPRESS is a standard data modeling language for product data. EXPRESS is formalized in the ISO Standard for the Exchange of Product model STEP (ISO 10303), and standardized as ISO 10303-11.〔(ISO 10303-11:2004 Industrial automation systems and integration ) -- Product data representation and exchange -- Part 11: Description methods: The EXPRESS language reference manual〕
== Overview ==
Data models formally define data objects and relationships among data objects for a domain of interest. Some typical applications of data models include supporting the development of databases and enabling the exchange of data for a particular area of interest. Data models are specified in a data modeling language.〔Michael R. McCaleb (1999). ("A Conceptual Data Model of Datum Systems" ). National Institute of Standards and Technology. August 1999.〕 EXPRESS is a data modeling language defined in ISO 10303-11, the EXPRESS Language Reference Manual.〔ISO International Standard 10303-11:1994, Industrial automation systems and integration — Product data representation andexchange — Part 11: Description methods: The EXPRESS language reference manual, International Organization for Standardization, Geneva, Switzerland (1994).〕
An EXPRESS data model can be defined in two ways, textually and graphically. For formal verification and as input for tools such as SDAI the textual representation within an ASCII file is the most important one. The graphical representation on the other hand is often more suitable for human use such as explanation and tutorials. The graphical representation, called EXPRESS-G, is not able to represent all details that can be formulated in the textual form.
EXPRESS is similar to programming languages such as Pascal. Within a SCHEMA various datatypes can be defined together with structural constraints and algorithmic rules. A main feature of EXPRESS is the possibility to formally validate a population of datatypes - this is to check for all the structural and algorithmic rules.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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