4 Information requirements

This clause specifies the information requirements for the Independent property application module. The information requirements are specified as the Application Reference Model (ARM) of this application module.

NOTE 1  A graphical representation of the information requirements is given in Annex C.

NOTE 2  The mapping specification is specified in 5.1. It shows how the information requirements are met by using common resources and constructs defined or imported in the MIM schema of this application module.

The following EXPRESS specification begins the Independent property schema.

4.1 ARM entity definitions

This subclause specifies the ARM entities for this module. Each ARM application entity is an atomic element that embodies a unique application concept and contains attributes specifying the data elements of the entity. The ARM entities and definitions are specified below.

4.1.1 Independent_property   

NOTE    It is independent of its application to characterize a product or an activity.

EXAMPLE 1   The physical property kinematic viscosity, defined in ISO 31, is an example of Independent_property.

EXPRESS specification:

*)
ENTITY Independent_property;
  id : STRING;
  property_type : STRING;
  description : OPTIONAL STRING;
END_ENTITY;
(*

Attribute definitions:

id: a string that specifies the identifier of the Independent_property.

property_type: a string that specifies the type of the Independent_property.

EXAMPLE 2   'kinematic viscosity' is an example of property_type.

description: the text that provides further information about the Independent_property. The value of this attribute need not be specified.

4.1.2 Independent_property_relationship   

EXAMPLE    An Independent_property_relationship may be used to indicate that the values of a Independent_property can be derived from the another Independent_property.

EXPRESS specification:

*)
ENTITY Independent_property_relationship;
  relation_type : STRING;
  description : OPTIONAL STRING;
  relating : Independent_property;
  related : Independent_property;
END_ENTITY;
(*

Attribute definitions:

relation_type: the meaning of the relationship.

Where applicable, the following values shall be used:

• 'decomposition': The Independent_property_relationship defines a relationship where the related Independent_property is a member of a group of Independent_property objects that is established by the relating property;
• 'dependency': The related Independent_property is dependent upon the relating Independent_property;
• 'hierarchy': The application object defines a hierarchical relationship where the related Independent_property is on a lower level than the relating Independent_property;
• 'peer': The related Independent_property and relating Independent_property are on equal footing;
• 'substitution': The Independent_property_relationship defines a relationship where the related Independent_property replaces the relating property;
• 'value domain': The Independent_property_relationship defines a relationship where the values assigned to the relating Independent_property shall be within the limits indicated by the values assigned to the related Independent_property.

description: the text that provides further information about the Independent_property_relationship. The value of this attribute need not be specified.

relating: one of the instances of Independent_property that is a part of the relationship.

NOTE 2   The semantics of this attribute is defined by the attribute relation_type.

related: the other of the instances of Independent_property that is a part of the relationship. If one element of the relationship is dependent upon the other, this attribute shall be the dependent one.

NOTE 1   The meaning of this attribute is defined by the attribute Independent_property_relationship.

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