Reuse types across nodes

[amelki]

If one define:

{
  pages: [
    home: {
      title: "Home page",
      content: "the content"
    }
  ]
}

It would be very convenient to be able to create another node under 'pages' (eg 'about') that obey to the same structure (same fields, same subtree).
This would mean supporting JSON schema definitions/$ref, and be able to define and use these via the UI.