* META should be active if one scheduled task and nothing else
** TASK Active task
SCHEDULED: <1997-01-01 Wed>
* META should be active if one task with deadline and nothing else
** TASK Active task
DEADLINE: <1997-01-01 Wed>
* META should be active if has one active subproject and nothing else
** META Subproject
*** TASK Active task
SCHEDULED: <1997-01-01 Wed>
