BS ISO 10303-11:2004

Industrial automation systems and integration. Product data representation and exchange. Description methods: The EXPRESS language reference manual | Status: Confirmed, Current

1 Scope This part of ISO 10303 specifies a language by which aspects of product data can be defined. The language is called EXPRESS. This part of ISO 10303 also specifies a graphical representation for a subset of the constructs in the EXPRESS language. This graphical representation is called EXPRESS-G. EXPRESS is a data specification language as defined in ISO 10303‑1. It consists of language elements that allow an unambiguous data definition and specification of constraints on the data defined. The following are within the scope of this part of ISO 10303:

• — data types;
• — constraints on instances of the data types.

The following are outside the scope of this part of ISO 10303:

• — definition of database formats;
• — definition of file formats;
• — definition of transfer formats;
• — process control;
• — information processing;
• — exception handling.

EXPRESS is not a programming language.