model: how to reference to the model itself?

[Ken]

I want to create a parent-child like catalog system.

from django.db import models

class Catalog(models.Model):
    username = models.EmailField()
    name = models.CharField(max_length=64)
    color = models.CharField(max_length=20)
    state = models.IntegerField()
    parentcatalog = models.ManyToOneRel(Catalog)

but when syncdb i got:
  File "/home/ken/sites/mysite/catalog/models.py", line 12, in Catalog
    parentcatalog = models.ManyToOneRel(Catalog)
NameError: name 'Catalog' is not defined

It seems like I cannot ref to a model which is not completely defined.
What should I do?

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