from sfa.util.faults import InvalidRSpec
from sfa.util.xrn import urn_to_hrn, Xrn
-from sfa.util.plxrn import slicename_to_hrn
from sfa.util.callids import Callids
#comes with its own logging
#from sfa.util.sfalogging import logger
from sfa.util.version import version_core
from sfa.trust.credential import Credential
-from sfa.planetlab.plaggregate import PlAggregate
-from sfa.planetlab.plslices import PlSlices
+
from sfa.rspecs.version_manager import VersionManager
from sfa.rspecs.rspec import RSpec
+from sfa.planetlab.plaggregate import PlAggregate
+from sfa.planetlab.plslices import PlSlices
+from sfa.planetlab.plxrn import slicename_to_hrn
+
##
# Meta data of an instance.
#