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LOM: Relation Resource Identifier Catalog

Relation: This category defines the relationship between this learning object and other learning objects, if any.

Relation Resource: It specifies the target learning object that this relationship references.

Relation Resource Identifier: It represents a globally unique label that identifies the target learning object.

Relation Resource Identifier Catalog: In this data element, need to specify the name or designator of the identification or cataloging scheme for this entry.
Example: "ISBN" ,"URI" etc..
The smallest permitted maximum characters are :1000.