Foreword

ISO/PDTS 10303-1072 was prepared by Technical Committee ISO/TC 184, Industrial automation systems and integration, Subcommittee SC4, Industrial data.

This International Standard is organized as a series of parts, each published separately. The parts of ISO 10303 fall into one of the following series: description methods, integrated resources, application inter-preted constructs, application modules, application protocols, abstract test suites, implementation methods, and conformance testing. The series are described in ISO 10303-1. A complete list of parts of ISO 10303 is available from the Internet:

http://www.nist.gov/sc4/editing/step/titles/.

Annexes A and B form an integral part of this part of ISO 10303. Annexes, C, D, E, aand F are for information only.

Introduction

This application module is concerned with the decomposition of an activity into a finite set of component activities or into an infinite set of component states.

NOTE - The decomposition of an activity is analogous to the decomposition of a product design into a finite set of volumes or into an infinite set of points, curves or surfaces.

A single activity can be decomposed into a one dimensional sequence of states. A parametric set of activities can be decomposed into a multi-dimensional state space, such that each activity within the set corresponds to a curve within the state space.

EXAMPLE - The dynamic transient cause by a mass of 100 Kg hitting the centre of 'widget type XYZ' at 50 m.sec^-1, is an activity. There is a one dimensional space of states of 'widget type XYZ' corresponding to times during the transient.

There is a family of activities corresponding to impacts between 50 m.sec^-1 and 100 m.sec^-1. There is a two dimensional space of states of 'widget type XYZ' corresponding to (time during transient, impact speed) pairs.

A product design that performs an activity can be decomposed into a set of features (i.e. points, curve, surfaces or finite volumes). If the activity is decomposed into a set activities or states, then there is a 'product' set that consists of each activity or state for each feature.

EXAMPLE - There is a three dimensional set of points within 'widget type XYZ'. There is a four dimensional set that consist of:

• each point within the product design that is 'widget type XYZ', for

• each state within the activity that is a mass of 100 Kg hitting the centre of 'widget type XYZ' at 50 m.sec^-1.

Industrial automation systems and integration —
Product data representation and exchange —
Part 1072: Application module: Activity or state space

1 Scope

This application module supports the definition of a set of activities or states.

The following are within the scope of this application module:

• the decomposition of an activity into a set of finite component activities;

  EXAMPLE - The activity 'start up of widget type XYZ' can be decomposed into a sequence of component activities each lasting 0.1 seconds.

  The activity 'start up of widget type XYZ' has a total time of 1000 seconds. The conponent activities are numbered from 1 to 10000.

• the decomposition of an activity into an infinite set of states;

  EXAMPLE - The activity 'start up of widget type XYZ' can be decomposed into a sequence of states.

  Each state is identified by a real number in the range [0, 1], so that state 0.0 is at the beginning of the activity and state 1.0 is at the end.

• the formation of a 'product' (i.e. '´') set of activities or states from:

  • a set of activities or states for a product design as a whole; and
  • a set of features for a product design.

  EXAMPLE - The activity 'start up of widget type XYZ' can be decomposed into a sequence of states for each of the points within 'widget type XYZ'.

  Each state for a point is identified by an array of four real numbers, where the first three identify the point within 'widget type XYZ' and the fourth identifies the state.

The following are not within the scope of this application module:

• properties of an activity or state;

  NOTE - A property of an activity or state are defined in the possession of property module. A property distribution over a space of activities or a space of states is defined in the property distribution module.

• the parameterisation of a set of activities or states by a mathematical space.

  NOTE - A parameterisation relationship between an activity or state space and a mathematical space is defined in the product activity and state space parameterisation module.