source:
  functions:
    - isWorkspaceRole(userId, workspaceId, role): root['/rels/workspaces/users'][workspaceId][userId]['role'] == role
  schema: {}
  access:
    - location: /
      read: isWorkspaceRole('a', 'b')
expected: {"rules":{".write":"false",".read":"(root.child('/rels/workspaces/users').child('b').child('a').child('role').val()==role)"}}