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Chapter 18

Describes how to associate items in a non-graphical way.

Overview

Using Relation Definitions and Relations

Creating a Relation Definition

Choosing a Relation Name

Using Permanent Relations

Understanding How G2 Saves Relations

Complying to Permanency

Maintaining Permanent Relations

Restoring Permanent Relations

Specifying the Cardinality of Relations

Defining an Inverse Relation

Defining a Symmetric Relation

Creating a Relation

Using Conclude to Create Relations

Example of Creating a Relation Between Two Items

Example of Creating a Relation Between an Item and a Class

Using a Sequence to Conclude a Relation

Example of Creating a Relation with a Sequence

Removing a Relation

Removing Relations by Deleting Items

Replacing a Relation

Using the Now Syntax

Example of Replacing a One-to-one Relation

Example of Replacing Multiple One-to-one Relations

Example of Replacing a Many-to-one Relation

Example of Replacing a One-to-many Relation

Invoking Rules using Relations

Using Whenever Rules to Detect Relatedness

Using Whenever Rules To Detect Cessation of Relations

Invoking Rules When a Relation is Created

Invoking Rules when a Relation is Deleted

Invoking Rules that Test whether a Relation Exists

Invoking Rules that Refer to Items with Relations

Invoking Rules that Refer to Variables with Relations

Working with Transient Items

Working with Deactivated and Disabled Items

Updating Relations While a KB is Running

Updating the First Class and Second Class

Updating the Type of Relation

Updating Symmetric Relations

Updating Relations While Executing Procedures

Updating a Relation While a Rule is Executing

Updating a Relation When Saving a KB Snapshot File

Expressions Involving Relations

Event Expressions

Logical Expressions

Relation Participation Expressions

Obtaining the Relationships of an Item

Obtaining Items Participating in a Relation

Generic Item References

The Relation Class

Describing the Items that Participate in a Relation

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