- * If the string is <literal>'flags'</literal> then the variant contains
- * an array. Each item in the array is a value that may appear zero or
- * one times in an array to be used as the value for this key. For
- * example, if the variant contained the array <literal>['x',
- * 'y']</literal> then the valid values for the key would be
- * <literal>[]</literal>, <literal>['x']</literal>,
- * <literal>['y']</literal>, <literal>['x', 'y']</literal> and
- * <literal>['y', 'x']</literal>.
- *
- * Finally, if the string is <literal>'range'</literal> then the variant
- * contains a pair of like-typed values -- the minimum and maximum
- * permissible values for this key.
+ * If the string is `'flags'` then the variant contains an array. Each
+ * item in the array is a value that may appear zero or one times in an
+ * array to be used as the value for this key. For example, if the
+ * variant contained the array `['x', 'y']` then the valid values for
+ * the key would be `[]`, `['x']`, `['y']`, `['x', 'y']` and
+ * `['y', 'x']`.
+ *
+ * Finally, if the string is `'range'` then the variant contains a pair
+ * of like-typed values -- the minimum and maximum permissible values
+ * for this key.