* STREAM_START
     * DOCUMENT_START
     * MAPPING_START
     * SCALAR value="foo"
     * SEQUENCE_START anchor="list"
     * SCALAR value="hello"
     * SCALAR value="world"
     * SEQUENCE_END
     * SCALAR value="bar"
     * ALIAS anchor="list"
     * MAPPING_END
     * DOCUMENT_END
     * DOCUMENT_START
     * SCALAR value="Goodbye"
     * DOCUMENT_END
     * STREAM_END