diff --git a/toscaparser/elements/TOSCA_definition_1_0.yaml b/toscaparser/elements/TOSCA_definition_1_0.yaml
index 14158cd..3cb74b9 100644
--- a/toscaparser/elements/TOSCA_definition_1_0.yaml
+++ b/toscaparser/elements/TOSCA_definition_1_0.yaml
@@ -299,12 +299,14 @@ tosca.nodes.network.Port:
           attached to specific Compute node instance
         capability: tosca.capabilities.network.Bindable
         relationship: tosca.relationships.network.BindsTo
+        node: tosca.nodes.Compute
     - link:
         description: >
           Link requirement expresses the relationship between Port and Network
           nodes. It indicates which network this port will connect to.
         capability: tosca.capabilities.network.Linkable
         relationship: tosca.relationships.network.LinksTo
+        node: tosca.nodes.network.Network
 
 tosca.nodes.ObjectStorage:
   derived_from: tosca.nodes.Root
diff --git a/toscaparser/elements/entity_type.py b/toscaparser/elements/entity_type.py
index bd185c3..8e3a4d0 100644
--- a/toscaparser/elements/entity_type.py
+++ b/toscaparser/elements/entity_type.py
@@ -86,16 +86,27 @@ class EntityType(object):
             defs = self.defs
         if ndtype in defs:
             value = defs[ndtype]
-        if parent and not value:
+        if parent:
             p = self.parent_type
-            while value is None:
-                # check parent node
-                if not p:
-                    break
-                if p and p.type == 'tosca.nodes.Root':
-                    break
-                value = p.get_value(ndtype)
-                p = p.parent_type
+            if p:
+                while p.type != 'tosca.nodes.Root':
+                    if p and p.type == 'tosca.nodes.Root':
+                        break
+                    if ndtype in p.defs:
+                        # get the parent value
+                        parent_value = p.defs[ndtype]
+                        if value:
+                            if isinstance(value, dict):
+                                for k, v in parent_value.items():
+                                    if k not in value.keys():
+                                        value[k] = v
+                            if isinstance(value, list):
+                                for p_value in parent_value:
+                                    if p_value not in value:
+                                        value.append(p_value)
+                        else:
+                            value = parent_value
+                    p = p.parent_type
         return value
 
     def get_definition(self, ndtype):
diff --git a/toscaparser/elements/nodetype.py b/toscaparser/elements/nodetype.py
index 8ddc5a2..2d545c7 100644
--- a/toscaparser/elements/nodetype.py
+++ b/toscaparser/elements/nodetype.py
@@ -128,7 +128,7 @@ class NodeType(StatefulEntityType):
     def get_capabilities_objects(self):
         '''Return a list of capability objects.'''
         typecapabilities = []
-        caps = self.get_value(self.CAPABILITIES)
+        caps = self.get_value(self.CAPABILITIES, None, True)
         if caps is None:
             caps = self.get_value(self.CAPABILITIES, None, True)
         if caps:
@@ -146,7 +146,7 @@ class NodeType(StatefulEntityType):
 
     @property
     def requirements(self):
-        return self.get_value(self.REQUIREMENTS)
+        return self.get_value(self.REQUIREMENTS, None, True)
 
     def get_all_requirements(self):
         requires = self.requirements
diff --git a/toscaparser/tests/test_properties.py b/toscaparser/tests/test_properties.py
index 79af9e2..beea3f3 100644
--- a/toscaparser/tests/test_properties.py
+++ b/toscaparser/tests/test_properties.py
@@ -192,7 +192,6 @@ class PropertyTest(TestCase):
         self.assertEqual(True, propertyInstance.required)
 
     def test_proprety_inheritance(self):
-        from toscaparser.nodetemplate import NodeTemplate
 
         tosca_custom_def = '''
           tosca.nodes.SoftwareComponent.MySoftware:
@@ -215,11 +214,7 @@ class PropertyTest(TestCase):
         expected_properties = ['component_version',
                                'install_path']
 
-        nodetemplates = yamlparser.\
-            simple_parse(tosca_node_template)['node_templates']
-        custom_def = yamlparser.simple_parse(tosca_custom_def)
-        name = list(nodetemplates.keys())[0]
-        tpl = NodeTemplate(name, nodetemplates, custom_def)
+        tpl = self._get_nodetemplate(tosca_node_template, tosca_custom_def)
         self.assertIsNone(tpl.validate())
         self.assertEqual(expected_properties,
                          sorted(tpl.get_properties().keys()))
@@ -254,7 +249,7 @@ class PropertyTest(TestCase):
         self.assertEqual(expected_message, str(error))
 
     def test_capability_proprety_inheritance(self):
-        tosca_custom_def = '''
+        tosca_custom_def_example1 = '''
           tosca.capabilities.ScalableNew:
             derived_from: tosca.capabilities.Scalable
             properties:
@@ -270,7 +265,7 @@ class PropertyTest(TestCase):
                 type: tosca.capabilities.ScalableNew
         '''
 
-        tosca_node_template = '''
+        tosca_node_template_example1 = '''
           node_templates:
             compute_instance:
               type: tosca.nodes.ComputeNew
@@ -280,9 +275,37 @@ class PropertyTest(TestCase):
                     min_instances: 1
         '''
 
+        tosca_custom_def_example2 = '''
+          tosca.nodes.ComputeNew:
+            derived_from: tosca.nodes.Compute
+            capabilities:
+              new_cap:
+                type: tosca.capabilities.Scalable
+        '''
+
+        tosca_node_template_example2 = '''
+          node_templates:
+            db_server:
+                type: tosca.nodes.ComputeNew
+                capabilities:
+                  host:
+                   properties:
+                     num_cpus: 1
+        '''
+
+        tpl1 = self._get_nodetemplate(tosca_node_template_example1,
+                                      tosca_custom_def_example1)
+        self.assertIsNone(tpl1.validate())
+
+        tpl2 = self._get_nodetemplate(tosca_node_template_example2,
+                                      tosca_custom_def_example2)
+        self.assertIsNone(tpl2.validate())
+
+    def _get_nodetemplate(self, tpl_snippet,
+                          custom_def_snippet=None):
         nodetemplates = yamlparser.\
-            simple_parse(tosca_node_template)['node_templates']
-        custom_def = yamlparser.simple_parse(tosca_custom_def)
+            simple_parse(tpl_snippet)['node_templates']
+        custom_def = yamlparser.simple_parse(custom_def_snippet)
         name = list(nodetemplates.keys())[0]
         tpl = NodeTemplate(name, nodetemplates, custom_def)
-        self.assertIsNone(tpl.validate())
+        return tpl