Links

Links

This section contains :gbbopen-core entities that pertain to links. A link represents a bi-directional relationship between two unit instances using an outgoing pointer at each unit instance pointing to the other. GBBopen's link operators maintain the bi-directional consistency of link pointers.

GBBopen also allows a link-pointer object to be used as an outgoing link pointer. An application developer can define a link-pointer object to hold attributes (such as “confidence” or “applicability conditions”) that are associated with the outgoing pointer.

Attributes of a link relationship that are not directional (attributes that are to be the same when obtained from either side of the link), are best represented by representing the “link” as a first-class unit instance rather than by maintaining a link-pointer object on each end of the link that have consistent values.

Entities

• check-all-instance-links
• check-link-definitions
• direct-link-definition
• effective-link-definition
• link-instance-of
• linkf
• link-setf
• link-slot-p
• standard-link-pointer
• unlinkf
• unlinkf-all

Links