Metacat

    protected static final String RESOURCE_ASSERT_RELATION = "assertRelation";

                } else if (resource.startsWith(RESOURCE_ASSERT_RELATION)) {

                    // after the command

                    extra = parseTrailing(resource, RESOURCE_ASSERT_RELATION);

                    // reserve the ID (in params)

                    if (httpVerb == GET) {

                        assertRelation(extra);

                        status = true;

                    }

     * Assert that a relationship exists between two resources

     * 

     * @param id

     * @return

     * @throws InvalidToken

     * @throws ServiceFailure

     * @throws NotAuthorized

     * @throws NotFound

     * @throws InvalidRequest

     * @throws NotImplemented

     */

    private boolean assertRelation(String id) throws InvalidToken,

            ServiceFailure, NotAuthorized, NotFound, InvalidRequest,

            NotImplemented {

        Identifier pidOfSubject = new Identifier();

        pidOfSubject.setValue(id);

        String relationship = null;

        try {

            relationship = params.get("relationship")[0];

        } catch (Exception e) {

            logMetacat.warn("relationship not specified");

        }

        Identifier pidOfObject = new Identifier();

        try {

            String objPid = params.get("pidOfObject")[0];

            pidOfObject.setValue(objPid);

        } catch (Exception e) {

            logMetacat.warn("pidOfObject not specified");

        }

        boolean result = CNodeService.getInstance(request).assertRelation(

                session, pidOfSubject, relationship, pidOfObject);

        response.setStatus(200);

        response.setContentType("text/xml");

        return result;

    }

    /**