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