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Attribute	Description
First-class	Name of the class of items that participate as the relation source. For example, if a TANK is part-of a SUBSYSTEM, then TANK is the first class.
Allowable values:	Any class name
Default value:	item
Second-class	Name of the class of items that participate as the relation target. For example, if a TANK is part-of a SUBSYSTEM, then SUBSYSTEM is the second class.
Allowable values:	Any class name
Default value:	item
Relation-name	Name of the relation.
Allowable values:	Any valid symbol that is unique within the KB
Default value:	none
Inverse-of-relation	Name of an automatically defined relation that is the inverse of Relation-name. When a relation defines an inverse, concluding the relation also concludes the inverse relation.
Allowable values:	Any valid symbol that is unique within the KB
Default value:	none
Notes:	You can enter an inverse relation only when the relation is not symmetric.
Type-of-relation	Cardinality of the relation.
Allowable values:	one-to-one one-to-many many-to-one many-to-many
Default value:	many-to-many
Relation-is-symmetric	Whether G2 creates an inverse relation of the same name as the relation between items of the second class and items of the first class.
Allowable values:	yes no
Default value:	no
Notes:	If a relation is symmetric, G2 requires that the Inverse-of-relation attribute contains the value none (that is, the relation name and inverse relation name are the same).
Relation-is-permanent	Determines whether G2 will save the relation through a KB restart and reset operation. For more information, see Using Permanent Relations.
Allowable values:	yes no
Default value:	no

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