Metacat

			throw new NotAuthorized("4881", Permission.CHANGE_PERMISSION + " not allowed by " + subject.getValue() + " on " + guid);	

		if (!hasPermission(session, pid, Permission.WRITE)) {

			throw new NotAuthorized("4720", Permission.WRITE + " not allowed by " + subject.getValue() + " on " + guid);	

	public boolean assertRelation(Session session, Identifier pidOfSubject, 

		// get the system metadata

		String guid1 = pidOfSubject.getValue();

		// are we allowed to do this?

		if (!hasPermission(session, pidOfSubject, Permission.READ)) {

			throw new NotAuthorized("4881", Permission.READ + " not allowed on " + guid1);	

		}

		SystemMetadata systemMetadata = null;

		try {

			systemMetadata = IdentifierManager.getInstance().getSystemMetadata(guid1);

		} catch (McdbDocNotFoundException e) {

			throw new NotFound("4884", "No record found for: " + guid1);

		}

		// check relationships

		// TODO: make this more strongly typed?

		if (relationship.equalsIgnoreCase("describes")) {

			return systemMetadata.getDescribeList().contains(pidOfObject);

		}

		if (relationship.equalsIgnoreCase("describedBy")) {

			return systemMetadata.getDescribedByList().contains(pidOfObject);

		}

		if (relationship.equalsIgnoreCase("derivedFrom")) {

			return systemMetadata.getDerivedFromList().contains(pidOfObject);

		}

		if (relationship.equalsIgnoreCase("obsoletes")) {

			return systemMetadata.getObsoleteList().contains(pidOfObject);

		}

		if (relationship.equalsIgnoreCase("obsoletedBy")) {

			return systemMetadata.getObsoletedByList().contains(pidOfObject);

		}