OSID - osid.relationship.Relationship Service Interface Definition

Interface	osid.relationship.Relationship
Implements	`osid.OsidRelationship`
Description	A `Relationship` is an object between two peers. The genus type indicates the relationship between the peer and the related peer.
Method	getSourceId
Description	Gets the from peer `Id` in this relationship.
Return	`osid.id.Id`		the peer
Compliance	`mandatory`		This method must be implemented.
Method	getDestinationId
Description	Gets the to peer `Id` in this relationship.
Return	`osid.id.Id`		the related peer
Compliance	`mandatory`		This method must be implemented.
Method	getRelationshipRecord
Description	Gets the relationshop record corresponding to the given `Relationship` record `Type.` This method is used to retrieve an object implementing the requested record. The `relationshipRecordType` may be the `Type` returned in `getRecordTypes()` or any of its parents in a `Type` hierarchy where `hasRecordType(relationshipRecordType)` is `true` .
Parameters	`osid.type.Type`	`relationshipRecordType`	the type of relationship record to retrieve
Return	`osid.relationship.records.RelationshipRecord`		the relationship record
Errors	NULL_ARGUMENT		`relationshipRecordType` is `null`
	OPERATION_FAILED		unable to complete request
	PERMISSION_DENIED		authorization failure occurred
	UNSUPPORTED		`hasRecordType(relationshipRecordType)` is `false`
Compliance	`mandatory`		This method must be implemented.