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diff --git a/rwlaunchpad/plugins/rwvns/rift/topmgr/sdnsim.py b/rwlaunchpad/plugins/rwvns/rift/topmgr/sdnsim.py
new file mode 100644
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+++ b/rwlaunchpad/plugins/rwvns/rift/topmgr/sdnsim.py
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+
+# 
+#   Copyright 2016 RIFT.IO Inc
+#
+#   Licensed under the Apache License, Version 2.0 (the "License");
+#   you may not use this file except in compliance with the License.
+#   You may obtain a copy of the License at
+#
+#       http://www.apache.org/licenses/LICENSE-2.0
+#
+#   Unless required by applicable law or agreed to in writing, software
+#   distributed under the License is distributed on an "AS IS" BASIS,
+#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#   See the License for the specific language governing permissions and
+#   limitations under the License.
+#
+
+from . import core
+import logging
+
+import xml.etree.ElementTree as etree
+from gi.repository import RwTopologyYang as RwTl
+
+import gi
+gi.require_version('RwYang', '1.0')
+from gi.repository import RwYang
+
+
+logger = logging.getLogger(__name__)
+
+
+class SdnSim(core.Topology):
+    def __init__(self):
+        super(SdnSim, self).__init__()
+        self._model = RwYang.Model.create_libncx()
+        self._model.load_schema_ypbc(RwTl.get_schema())
+
+    def get_network_list(self, account):
+        """
+        Returns the discovered network
+
+        @param account - a SDN account
+
+        """
+
+        nwtop = RwTl.YangData_IetfNetwork()
+        #topology_source = "/net/boson/home1/rchamart/work/topology/l2_top.xml"
+        if not account.sdnsim.has_field('topology_source') or account.sdnsim.topology_source is None:
+            return nwtop
+        topology_source = account.sdnsim.topology_source
+        logger.info("Reading topology file: %s", topology_source)
+        if 'json' in topology_source: 
+            with open(topology_source,'r') as f:
+                print("Reading static topology file")
+                op_json = f.read()
+                nwtop.from_json(self._model,op_json)
+                for nw in nwtop.network:
+                   nw.server_provided = False
+                   logger.debug("...Network id %s", nw.network_id)
+                   #nw_xpath = ("D,/nd:network[network-id=\'{}\']").format(nw.network_id)
+                   #xact_info.respond_xpath(rwdts.XactRspCode.MORE,
+                   #                 nw_xpath, nw)
+        elif 'xml' in topology_source:
+            tree = etree.parse(topology_source)
+            root = tree.getroot()
+            xmlstr = etree.tostring(root, encoding="unicode")
+
+            # The top level topology object does not have XML conversion
+            # Hence going one level down
+            #l2nw1 = nwtop.network.add()
+            #l2nw1.from_xml_v2(self._model, xmlstr)
+            nwtop.from_xml_v2(self._model,xmlstr)
+
+            logger.debug("Returning topology data imported from XML file")
+
+        return nwtop