Import interface from file

[uvdsl]

Hi, just a quick (and maybe stupid) question:
How should an interface file be structured?
Eg I have an interface.vy and a contract.vy in the same folder. Contract.vy should implement interface.vy.
in my interface.vy, should there by just the public functions and events? only functions? or should there be an interface declaration... I am really confused right now...

Bonus question: where should the implements: interface be placed in contract.vy? At the top or in the interface section of of contract.vy?

interface.vy:

# @version ^0.2.8

#################
###  structs  ###
#################

#################
###   event   ###
#################

event myEvent: 
    _myBytes: bytes32

#################
###   inter   ###
#################

#################
###   props   ###
#################

#################
### functions ###
#################

@payable
@external
def requestStatementOn(myBytes: bytes32): # issue request and event as trigger
    pass

@payable
@external
def setStatementOn(myBytes: bytes32, statement: bool): # change state, emit event as trigger
    pass

@view
@external
def getStatementOn(myBytes: bytes32):
    pass

contract.vy

# @version ^0.2.8

#################
###  structs  ###
#################

#################
###   event   ###
#################

event myEvent: 
    _myBytes: bytes32

#################
###   inter   ###
#################

import interface as _interface

implements: _interface

#################
###   props   ###
#################

_statement_mapping: HashMap[bytes32, bool] 

#################
### functions ###
#################

@payable
@external
def requestStatementOn(myBytes: bytes32): # issue request and event as trigger
    pass

@payable
@external
def setStatementOn(myBytes: bytes32, statement: bool): # change state, emit event as trigger
    pass

@view
@external
def getStatementOn(myBytes: bytes32):
    pass

The compilation error I get:

UndeclaredDefinition: Unknown interface: _interface
line 18:0
17
---> 18 import interface as _interface
--------^

UndeclaredDefinition: '_inter' has not been declared

It is surely obvious, but I seem to be blind atm...
Thanks!