[TYPO3-dev] ext_emconf.php - content of $EM_CONF[$_EXTKEY][constraints]? it's not in the TYPO3 Core APIs

[Johannes Konert]

Dear list members,
I found the TYPO3 CORE APIs very helpful, but could not find any 
information about the (maybe new in version 4?) array-field 'constraints'.
Where is the syntax mentioned? What should be written in the fields?
Is it just the same than the $EM_CONF[$_EXTKEY][dependencies],[conflicts] ?

Thanks a lot for any hints.
Regards Johannes

This is the part I do not find anything about in the CORE APIs:
$EM_CONF[$_EXTKEY] = array(
	..
	'constraints' => array(
		'depends' => array(
		),
		'conflicts' => array(
		),
		'suggests' => array(
		),
	),