The YAML-format data. This should be enclosed inside triple-quotes to preserve the data correctly.
If more than one ymlfront directive is given per page, the result is undefined.
-Likewise, it is inadvisable to try to mix the "---" ymlfront format with the directive form of the data.
+Likewise, it is inadvisable to try to mix the non-directive ymlfront format with the directive form of the data.