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  • ISO
    ISO 13584-20:1998 Industrial automation systems and integration - Parts library - Part 20: Logical resource: Logical model of expressions
    Edition: 1998
    $629.86
    / user per year

Content Description

This part of ISO 13584 specifies:

  • an EXPRESS schema for generic expressions;
  • an EXPRESS schema for expressions, that models the subset of the allowed expressions in the EXPRESS language defined in ISO 10303-11 that corresponds to integer, real, Boolean and string data types. This schema uses the resources defined in the generic expression schema.

The following are within the scope of this part of ISO 13584:

  • the exchange of expressions that involve both constants and variables;
  • the function that checks whether or not a numeric expression should evaluate to an integer value;
  • the constraints which ensure that an expression is semantically correct;
  • the computation of the variables or functions used in an expression;
  • the function that checks if an expression may be mapped on to the SQL query language.

The following are outside the scope of this part of ISO 13584:

  • the assignment of values to variables within some context;
  • the triggering mechanism that computes the value of an expression in a given context.


About ISO

ISO, the International Organization for Standardization, brings global experts together to agree on the best way of doing things – for anything from making a product to managing a process. As one of the oldest non-governmental international organizations, ISO has enabled trade and cooperation between people and companies all over the world since 1946. The International Standards published by ISO serve to make lives easier, safer and better.
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