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