@Test
public void shouldNotConsiderAsEqualAnyNamespacesWithDifferentUris() {

    assertThat(ns1.equals(ns2), is(false));
    assertThat(ns2.equals(ns1), is(false));
    assertThat(ns3.equals(ns4), is(false));
    assertThat(ns4.equals(ns3), is(false));
}