public ExtendedRelation addFeaturesRelationship(
			String baseFeaturesTableName, String relatedFeaturesTableName,
			UserMappingTable userMappingTable) {
		return addRelationship(baseFeaturesTableName, relatedFeaturesTableName,
				userMappingTable, RelationType.FEATURES);
	}
public ExtendedRelation addFeaturesRelationship ( String baseFeaturesTableName , String relatedFeaturesTableName , UserMappingTable userMappingTable ) { return addRelationship ( baseFeaturesTableName , relatedFeaturesTableName , userMappingTable , RelationType . FEATURES ) ; }
Adds a features relationship between the base feature and related feature
table. Creates the user mapping table if needed.

@param baseFeaturesTableName
base features table name
@param relatedFeaturesTableName
related features table name
@param userMappingTable
user mapping table
@return The relationship that was added