gistfile1.py

import neo4django
from neo4django.db import models

class Preceding(models.NodeModel):
    precedes_events = models.Relationship('Event', rel_type=neo4django.Outgoing.PRECEDES_EVENT,
                                          related_name='preceded_by')
    precedes_conditions = models.Relationship('Condition', rel_type=neo4django.Outgoing.PRECEDES_CONDITION,
                                              related_name='preceded_by')

class Event(Preceding):
    pass

class Actor(Preceding):
    pass

class Condition(Preceding):
    pass