I notice that the docs use the terms “component”, “item”, and (yes…) “component item”. It’s not just a matter of phrasing because there seems to be an actual difference in meaning. For example: “If you want to specify the dimensions of an item rather than of a component, include height and width parameters into the component’s type property.”
And then there’s “controls”. Sigh.
Seems like “item” refers to a component or control within a containing component. God only knows what a “component item” might be.
Is there a dictionary or glossary anywhere?