@Test
 public void testRetrieval() {
   Assert.assertTrue(
       SwordContentPackageTypes.instance().isValidType("http://www.imsglobal.org/xsd/imscp_v1p1"));
   Assert.assertTrue(
       SwordContentPackageTypes.instance().isValidType("http://www.imsglobal.org/xsd/imscp_v1p2"));
   Assert.assertTrue(SwordContentPackageTypes.instance().isValidType("http://www.loc.gov/METS/"));
   Assert.assertTrue(SwordContentPackageTypes.instance().isValidType("TBC"));
 }
 @Test
 public void testElements() {
   int count = 0;
   for (Enumeration e = SwordContentPackageTypes.instance().keys(); e.hasMoreElements(); ) {
     System.out.println(e.nextElement());
     count++;
   }
   Assert.assertTrue(count == 4);
 }