switch (next) {
                case XMLStreamReader.SPACE:
                case XMLStreamReader.COMMENT:
                case XMLStreamReader.PROCESSING_INSTRUCTION:
                case XMLStreamReader.CDATA:
                case XMLStreamReader.CHARACTERS:
                    continue;
                case XMLStreamReader.START_ELEMENT:
                case XMLStreamReader.END_ELEMENT:
                    return next;

//     field name in the XML element.
//   - a field with tag ",chardata" is written as character data,
//     not as an XML element.
//   - a field with tag ",cdata" is written as character data
//     wrapped in one or more <![CDATA[ ... ]]> tags, not as an XML element.
//   - a field with tag ",innerxml" is written verbatim, not subject
//     to the usual marshaling procedure.