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