I finished reading Web Thing API , but anyway, I've read WoT Capability Schemas, but did not find any RFC file definition of property resource.
I see this discussion Actions vs. Properties #4 and this answer.

Fair enough. You could represent that state with two booleans (as you have) or with an integer (0, 1, 2, 3) or a string "on", "of", "turningOn", "turningOff".

This would make it impossible for me to define exactly and use a property resource.

• I want to know in WoT Capability Schemas what are the properties of definition?
• Are there any RFC files that define Properties resource?