[Pacemaker] parametr "kind" in "order"

[Andrey Groshev]

Hi All,
I see in PCMK Expl.
Explein http://clusterlabs.org/doc/en-US/Pacemaker/1.1/html/Pacemaker_Explained/s-resource-ordering.html#_mandatory_ordering

What the parameter "kind"? Written "since 1.1.2"
This unrealized plans or something I do not understand?