code: @XmlElementDecl(namespace = "http://www.w3.org/1998/Math/MathML", name = "diff")
      public JAXBElement<DiffType> createDiff(DiffType value) {
          return new JAXBElement<DiffType>(_Diff_QNAME, DiffType.class, null, value);
      }
docs: Create an instance of {@link JAXBElement }{@code <}{@link DiffType }{@code >}}