<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def from_raw(self, robj: RawObject) -> RootNode: """Create an instance node from a raw data tree. Args: robj: Dictionary representing a raw data tree. Returns: Root instance node. """

        cooked = self.schema.from_raw(robj)
        return RootNode(cooked, self.schema, cooked.timestamp)