code: function(tag, start_line, start_column) {
    return { t: tag,
             open: true,
             last_line_blank: false,
             start_line: start_line,
             start_column: start_column,
             end_line: start_line,
             children: [],
             parent: null,
             // string_content is formed by concatenating strings, in finalize:
             string_content: "",
             strings: [],
             inline_content: []
          };
  }
docs: DOC PARSER These are methods of a DocParser object, defined below.