#1 ImportError: No module named BNode

[sulc]

problem description:
I read the install file. I tried to download pellet-1.3-beta2 from http://www.mindswap.org/2003/pellet/ but the page does not work. I have not found a mirror to get the package.
C:\work\seth>setup.py
Traceback (most recent call last):
File "C:\work\seth\setup.py", line 2, in <module>
from seth import __version__, __date__
File "C:\work\seth\seth\__init__.py", line 12, in <module>
from seth.DefsGenerator import DefsGenerator
File "C:\work\\seth\seth\DefsGenerator.py", line 3, in <module>
import rdflib.BNode
ImportError: No module named BNode

The command import rdflib.BNode also result in an error using the python command line interpreter; but from rdflib import BNode works. How could I solve my installation problem and where can I download pellet?

environment:
- Python 2.7.1
- rdflib-3.0.0.0
- jpype-0.5.4-win32-py2.7
- java version 1.6.0_21