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diff --git a/git/db/py/complex.py b/git/db/py/complex.py
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+# Copyright (C) 2010, 2011 Sebastian Thiel (byronimo@gmail.com) and contributors
+#
+# This module is part of PurePartialGitDB and is released under
+# the New BSD License: http://www.opensource.org/licenses/bsd-license.php
+from git.db.interface import HighLevelRepository
+from base import (
+						PureCompoundDB, 
+						PureObjectDBW, 
+						PureRootPathDB, 
+						PureRepositoryPathsMixin,
+						PureConfigurationMixin,
+						PureAlternatesFileMixin,
+						PureIndexDB,
+					)
+from transport import PureTransportDB
+from resolve import PureReferencesMixin
+
+from loose import PureLooseObjectODB
+from pack import PurePackedODB
+from ref import PureReferenceDB
+from submodule import PureSubmoduleDB
+
+from git.db.compat import RepoCompatibilityInterface
+
+from git.util import (
+						LazyMixin, 
+						normpath,
+						join,
+						dirname
+					)
+from git.exc import (
+						InvalidDBRoot, 
+						BadObject, 
+						AmbiguousObjectName
+						)
+import os
+
+__all__ = ('PureGitODB', 'PurePartialGitDB', 'PureCompatibilityGitDB')
+
+
+class PureGitODB(PureRootPathDB, PureObjectDBW, PureCompoundDB, PureAlternatesFileMixin):
+	"""A git-style object-only database, which contains all objects in the 'objects'
+	subdirectory.
+	:note: The type needs to be initialized on the ./objects directory to function, 
+		as it deals solely with object lookup. Use a PurePartialGitDB type if you need
+		reference and push support."""
+	# Configuration
+	PackDBCls = PurePackedODB
+	LooseDBCls = PureLooseObjectODB
+	PureReferenceDBCls = PureReferenceDB
+	
+	# Directories
+	packs_dir = 'pack'
+	loose_dir = ''
+	
+	
+	def __init__(self, root_path):
+		"""Initialize ourselves on a git ./objects directory"""
+		super(PureGitODB, self).__init__(root_path)
+		
+	def _set_cache_(self, attr):
+		if attr == '_dbs' or attr == '_loose_db':
+			self._dbs = list()
+			loose_db = None
+			for subpath, dbcls in ((self.packs_dir, self.PackDBCls), 
+									(self.loose_dir, self.LooseDBCls),
+									(self.alternates_filepath, self.PureReferenceDBCls)):
+				path = self.db_path(subpath)
+				if os.path.exists(path):
+					self._dbs.append(dbcls(path))
+					if dbcls is self.LooseDBCls:
+						loose_db = self._dbs[-1]
+					# END remember loose db
+				# END check path exists
+			# END for each db type
+			
+			# should have at least one subdb
+			if not self._dbs:
+				raise InvalidDBRoot(self.root_path())
+			# END handle error
+			
+			# we the first one should have the store method
+			assert loose_db is not None and hasattr(loose_db, 'store'), "One database needs store functionality"
+			
+			# finally set the value
+			self._loose_db = loose_db
+		else:
+			super(PureGitODB, self)._set_cache_(attr)
+		# END handle attrs
+		
+	#{ PureObjectDBW interface
+		
+	def store(self, istream):
+		return self._loose_db.store(istream)
+		
+	def ostream(self):
+		return self._loose_db.ostream()
+	
+	def set_ostream(self, ostream):
+		return self._loose_db.set_ostream(ostream)
+		
+	#} END objectdbw interface
+	
+	
+	
+class PurePartialGitDB(PureGitODB, 
+				PureRepositoryPathsMixin, PureConfigurationMixin, 
+				PureReferencesMixin, PureSubmoduleDB, 
+				PureIndexDB, PureTransportDB
+				# HighLevelRepository  Currently not implemented !
+				):
+	"""Git like database with support for object lookup as well as reference resolution.
+	Our rootpath is set to the actual .git directory (bare on unbare).
+	
+	The root_path will be the git objects directory. Use git_path() to obtain the actual top-level 
+	git directory."""
+	#directories
+	
+	def __init__(self, root_path):
+		"""Initialize ourselves on the .git directory, or the .git/objects directory."""
+		PureRepositoryPathsMixin._initialize(self, root_path)
+		super(PurePartialGitDB, self).__init__(self.objects_dir)
+	
+	
+	
+class PureCompatibilityGitDB(PurePartialGitDB, RepoCompatibilityInterface):
+	"""Pure git database with a compatability layer required by 0.3x code"""
+