and ``required`` properties.
- ``init`` - this option has a default value, either a string (if it is a
- parameter), or a boolean (if it is a switch; boolean constants are called
- ``true`` and ``false``). List options can't have this attribute. Usage
- examples: ``(switch_option "foo", (init true))``; ``(prefix_option "bar",
- (init "baz"))``.
+ parameter), or a boolean (if it is a switch; as in C++, boolean constants
+ are called ``true`` and ``false``). List options can't have ``init``
+ attribute.
+ Usage examples: ``(switch_option "foo", (init true))``; ``(prefix_option
+ "bar", (init "baz"))``.
- ``extern`` - this option is defined in some other plugin, see `below`__.