title: Allowed parents and Allowed children property in CQ template
body: <p>What is the purpose of allowed parents and allowed children property while creating a cq template?
  The description in <a href="https://docs.adobe.com/docs/en/cq/5-4/developing/components.html" rel="nofollow noreferrer">documentation</a> simply says "Path of a component that is allowed to be a parent of this component"/"Path of a component that is allowed to be a child of this component".
  What is the importance of these properties?</p>