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