i test OH3. By my installation i work with text files. In the Example for the semantiv model i see, a bulb can be a top, an the Brightness etc can be child.
But i dont know, how i can write this in textfiles. The Bulbchannel are not the problem, but by the thing, i dont understand the tagging.
you cant define it for a Thing. You need a new Group.
At the GUI you can make a new Group from Things. My misunderstoud, i think this a semantic Type of a Thing. But it is only a group.
Follow the first instruction in the first answer. There is a example, how you define it.