diff --git a/lib/rdcl_graph.py b/lib/rdcl_graph.py
new file mode 100644
index 0000000..9d96251
--- /dev/null
+++ b/lib/rdcl_graph.py
@@ -0,0 +1,82 @@
+#
+#   Copyright 2017 CNIT - Consorzio Nazionale Interuniversitario per le Telecomunicazioni
+#
+#   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  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.
+#
+
+import json
+import logging
+import copy
+
+logging.basicConfig(level=logging.DEBUG)
+log = logging.getLogger('RdclGraph')
+
+
+class RdclGraph(object):
+    """ Operates on the graph representation used for the GUI graph views """
+
+    node_t3d_base = {
+        'info': {
+            'property': {
+                'custom_label': '',
+            },
+            'type': '',
+            'group': []
+        }
+    }
+
+    def __init__(self):
+        pass
+
+    def add_link(self, source, target, view, group, graph_object, optional={}):
+        if (source is None) or (target is None):
+            return
+        edge_obj = {
+            'source': source,
+            'target': target,
+            'view': view,
+            'group': [group],
+
+        }
+
+        edge_obj.update(optional)
+        if edge_obj not in graph_object['edges']:
+            graph_object['edges'].append(edge_obj)
+
+    def add_node(self, id, type, group, positions, graph_object, optional={}):
+        if id is None:
+            return
+        node = next((x for x in graph_object['vertices'] if x['id'] == id), None)
+        if node is not None:
+            node['info']['group'].append(group)
+        else:
+            node = copy.deepcopy(self.node_t3d_base)
+            node['id'] = id
+            node['info']['type'] = type
+            if group is not None:
+                node['info']['group'].append(group)
+            if positions and id in positions['vertices'] and 'x' in positions['vertices'][id] and 'y' in positions['vertices'][id]:
+                node['fx'] = positions['vertices'][id]['x']
+                node['fy'] = positions['vertices'][id]['y']
+            node['info'].update(optional)
+            graph_object['vertices'].append(node)
+
+    def is_directed_edge(self, source_type=None, target_type=None, layer=None, model={}):
+        if source_type is None or target_type is None or layer is None:
+            return None
+        if layer in model['layer'] and 'allowed_edges' in model['layer'][layer]:
+            if source_type in model['layer'][layer]['allowed_edges'] and target_type in model['layer'][layer]['allowed_edges'][source_type]['destination']:
+                edge_pro = model['layer'][layer]['allowed_edges'][source_type]['destination'][target_type]
+                return edge_pro['direct_edge'] if 'direct_edge' in edge_pro else False
+
+        return None