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