assertEquals(null, xml.getProperties().getCoreProperties().getTitle());
    assertEquals(null, xml.getProperties().getCoreProperties().getUnderlyingProperties().getSubjectProperty().getValue());
  }
  public void testMetadataComplex() {
    XWPFDocument xml = XWPFTestDataSamples.openSampleDocument("IllustrativeCases.docx");
    assertNotNull(xml.getProperties().getCoreProperties());
    assertNotNull(xml.getProperties().getExtendedProperties());
    assertEquals("Microsoft Office Outlook", xml.getProperties().getExtendedProperties().getUnderlyingProperties().getApplication());
    assertEquals(5184, xml.getProperties().getExtendedProperties().getUnderlyingProperties().getCharacters());
    assertEquals(0, xml.getProperties().getExtendedProperties().getUnderlyingProperties().getLines());
    assertEquals(" ", xml.getProperties().getCoreProperties().getTitle());
    assertEquals(" ", xml.getProperties().getCoreProperties().getUnderlyingProperties().getSubjectProperty().getValue());
  }