code: @XmlElementDecl(namespace = "https://www.google.com/apis/ads/publisher/v201902", name = "RequestHeader")
      public JAXBElement<SoapRequestHeader> createRequestHeader(SoapRequestHeader value) {
          return new JAXBElement<SoapRequestHeader>(_RequestHeader_QNAME, SoapRequestHeader.class, null, value);
      }
docs: Create an instance of {@link JAXBElement }{@code <}{@link SoapRequestHeader }{@code >}}