This Resource describes how open or ajar an entity such as a window, door, blind or shutter is.The Property ‘openLevel’ can be read (acting as a sensor).The ‘openLevel’ can also be set (acting as an actuator).The ‘openLevel’ is device dependent across the range provided.When the Property ‘range’ is omitted then 0 to 100 is assumed where 0 means closed, 100 means fully open.If a ‘range’ is provided then the lower bound=closed, upper bound=open.If Property ‘step’ is present then it represents the increment between possible values; if not provided 1 is assumed.