http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/531b6006/extensions/aria_extension_tosca/profiles/tosca-simple-1.0/interfaces.yaml
----------------------------------------------------------------------
diff --git 
a/extensions/aria_extension_tosca/profiles/tosca-simple-1.0/interfaces.yaml 
b/extensions/aria_extension_tosca/profiles/tosca-simple-1.0/interfaces.yaml
index 473bd98..29cc8dd 100644
--- a/extensions/aria_extension_tosca/profiles/tosca-simple-1.0/interfaces.yaml
+++ b/extensions/aria_extension_tosca/profiles/tosca-simple-1.0/interfaces.yaml
@@ -24,7 +24,7 @@ interface_types:
       specification_url: 
'http://docs.oasis-open.org/tosca/TOSCA-Simple-Profile-YAML/v1.0/cos01/TOSCA-Simple-Profile-YAML-v1.0-cos01.html#_Ref384391055'
     description: >-
       This is the default (root) TOSCA Interface Type definition that all 
other TOSCA Interface Types derive from.
-  
+
   tosca.interfaces.node.lifecycle.Standard:
     _extensions:
       shorthand_name: Standard

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/531b6006/extensions/aria_extension_tosca/profiles/tosca-simple-1.0/nodes.yaml
----------------------------------------------------------------------
diff --git 
a/extensions/aria_extension_tosca/profiles/tosca-simple-1.0/nodes.yaml 
b/extensions/aria_extension_tosca/profiles/tosca-simple-1.0/nodes.yaml
index 1d2fe90..05963b7 100644
--- a/extensions/aria_extension_tosca/profiles/tosca-simple-1.0/nodes.yaml
+++ b/extensions/aria_extension_tosca/profiles/tosca-simple-1.0/nodes.yaml
@@ -45,14 +45,14 @@ node_types:
         type: tosca.interfaces.node.lifecycle.Standard
     capabilities:
       feature:
-        type: tosca.capabilities.Node  
+        type: tosca.capabilities.Node
     requirements:
       - dependency:
           capability: tosca.capabilities.Node
           node: tosca.nodes.Root
           relationship: tosca.relationships.DependsOn
           occurrences: [ 0, UNBOUNDED ]
-  
+
   tosca.nodes.Compute:
     _extensions:
       shorthand_name: Compute
@@ -133,11 +133,11 @@ node_types:
           capability: tosca.capabilities.Endpoint
           relationship: tosca.relationships.RoutesTo
           occurrences: [ 0, UNBOUNDED ]
-  
+
   #
   # Software
   #
-  
+
   tosca.nodes.SoftwareComponent:
     _extensions:
       shorthand_name: SoftwareComponent
@@ -211,7 +211,7 @@ node_types:
           capability: tosca.capabilities.Container
           node: tosca.nodes.WebServer
           relationship: tosca.relationships.HostedOn
-  
+
   tosca.nodes.DBMS:
     _extensions:
       shorthand_name: DBMS # ARIA NOTE: omitted in the spec
@@ -276,7 +276,7 @@ node_types:
           capability: tosca.capabilities.Container
           node: tosca.nodes.DBMS
           relationship: tosca.relationships.HostedOn
-  
+
   #
   # Container
   #
@@ -351,7 +351,7 @@ node_types:
     capabilities:
       storage_endpoint:
         type: tosca.capabilities.Endpoint
-  
+
   tosca.nodes.BlockStorage:
     _extensions:
       shorthand_name: BlockStorage
@@ -463,7 +463,7 @@ node_types:
     capabilities:
       link:
         type: tosca.capabilities.network.Linkable
-  
+
   tosca.nodes.network.Port:
     _extensions:
       shorthand_name: Port
@@ -472,7 +472,7 @@ node_types:
       specification_section: 7.5.2
     description: >-
       The TOSCA Port node represents a logical entity that associates between 
Compute and Network normative types.
-      
+
       The Port node type effectively represents a single virtual NIC on the 
Compute node instance.
     derived_from: tosca.nodes.Root
     properties:

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/531b6006/extensions/aria_extension_tosca/profiles/tosca-simple-1.0/policies.yaml
----------------------------------------------------------------------
diff --git 
a/extensions/aria_extension_tosca/profiles/tosca-simple-1.0/policies.yaml 
b/extensions/aria_extension_tosca/profiles/tosca-simple-1.0/policies.yaml
index c65e38b..7b35bb9 100644
--- a/extensions/aria_extension_tosca/profiles/tosca-simple-1.0/policies.yaml
+++ b/extensions/aria_extension_tosca/profiles/tosca-simple-1.0/policies.yaml
@@ -24,7 +24,7 @@ policy_types:
       specification_url: 
'http://docs.oasis-open.org/tosca/TOSCA-Simple-Profile-YAML/v1.0/cos01/TOSCA-Simple-Profile-YAML-v1.0-cos01.html#DEFN_TYPE_POLICIES_ROOT'
     description: >-
       This is the default (root) TOSCA Policy Type definition that all other 
TOSCA base Policy Types derive from.
-  
+
   tosca.policies.Placement:
     _extensions:
       shorthand_name: Placement # ARIA NOTE: omitted in the spec
@@ -35,7 +35,7 @@ policy_types:
     description: >-
       This is the default (root) TOSCA Policy Type definition that is used to 
govern placement of TOSCA nodes or groups of nodes.
     derived_from: tosca.policies.Root
-  
+
   tosca.policies.Scaling:
     _extensions:
       shorthand_name: Scaling # ARIA NOTE: omitted in the spec
@@ -46,7 +46,7 @@ policy_types:
     description: >-
       This is the default (root) TOSCA Policy Type definition that is used to 
govern scaling of TOSCA nodes or groups of nodes.
     derived_from: tosca.policies.Root
-  
+
   tosca.policies.Update:
     _extensions:
       shorthand_name: Update # ARIA NOTE: omitted in the spec
@@ -57,7 +57,7 @@ policy_types:
     description: >-
       This is the default (root) TOSCA Policy Type definition that is used to 
govern update of TOSCA nodes or groups of nodes.
     derived_from: tosca.policies.Root
-  
+
   tosca.policies.Performance:
     _extensions:
       shorthand_name: Performance # ARIA NOTE: omitted in the spec

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/531b6006/extensions/aria_extension_tosca/profiles/tosca-simple-1.0/relationships.yaml
----------------------------------------------------------------------
diff --git 
a/extensions/aria_extension_tosca/profiles/tosca-simple-1.0/relationships.yaml 
b/extensions/aria_extension_tosca/profiles/tosca-simple-1.0/relationships.yaml
index b9d3176..9f2c32c 100644
--- 
a/extensions/aria_extension_tosca/profiles/tosca-simple-1.0/relationships.yaml
+++ 
b/extensions/aria_extension_tosca/profiles/tosca-simple-1.0/relationships.yaml
@@ -43,7 +43,7 @@ relationship_types:
     interfaces:
       Configure:
         type: tosca.interfaces.relationship.Configure
-  
+
   tosca.relationships.DependsOn:
     _extensions:
       shorthand_name: DependsOn
@@ -55,7 +55,7 @@ relationship_types:
       This type represents a general dependency relationship between two nodes.
     derived_from: tosca.relationships.Root
     valid_target_types: [ tosca.capabilities.Node ]
-  
+
   tosca.relationships.HostedOn:
     _extensions:
       shorthand_name: HostedOn
@@ -67,7 +67,7 @@ relationship_types:
       This type represents a hosting relationship between two nodes.
     derived_from: tosca.relationships.Root
     valid_target_types: [ tosca.capabilities.Container ]
-  
+
   tosca.relationships.ConnectsTo:
     _extensions:
       shorthand_name: ConnectsTo
@@ -83,7 +83,7 @@ relationship_types:
       credential:
         type: tosca.datatypes.Credential
         required: false
-  
+
   tosca.relationships.AttachesTo:
     _extensions:
       shorthand_name: AttachesTo
@@ -116,7 +116,7 @@ relationship_types:
           The logical name of the device as exposed to the instance.
           Note: A runtime property that gets set when the model gets 
instantiated by the orchestrator.
         type: string
-  
+
   tosca.relationships.RoutesTo:
     _extensions:
       shorthand_name: RoutesTo
@@ -128,11 +128,11 @@ relationship_types:
       This type represents an intentional network routing between two 
Endpoints in different networks.
     derived_from: tosca.relationships.ConnectsTo
     valid_target_types: [ tosca.capabilities.Endpoint ]
-  
+
   #
   # Network
   #
-  
+
   tosca.relationships.network.LinksTo:
     _extensions:
       shorthand_name: LinksTo
@@ -144,7 +144,7 @@ relationship_types:
       This relationship type represents an association relationship between 
Port and Network node types.
     derived_from: tosca.relationships.DependsOn
     valid_target_types: [ tosca.capabilities.network.Linkable ]
-  
+
   tosca.relationships.network.BindsTo:
     _extensions:
       shorthand_name: BindsTo # ARIA NOTE: the spec says "network.BindsTo" 
which seems wrong

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/531b6006/extensions/aria_extension_tosca/profiles/tosca-simple-nfv-1.0/nodes.yaml
----------------------------------------------------------------------
diff --git 
a/extensions/aria_extension_tosca/profiles/tosca-simple-nfv-1.0/nodes.yaml 
b/extensions/aria_extension_tosca/profiles/tosca-simple-nfv-1.0/nodes.yaml
index 73f0ecd..8d1f0a2 100644
--- a/extensions/aria_extension_tosca/profiles/tosca-simple-nfv-1.0/nodes.yaml
+++ b/extensions/aria_extension_tosca/profiles/tosca-simple-nfv-1.0/nodes.yaml
@@ -98,11 +98,11 @@ node_types:
         # ARIA NOTE: commented out in 5.9.2.5
         description: >-
           Monitoring parameter, which can be tracked for a VNFC based on this 
VDU. Examples include:
-          memory-consumption, CPU-utilisation, bandwidth-consumption, VNFC 
downtime, etc.        
+          memory-consumption, CPU-utilisation, bandwidth-consumption, VNFC 
downtime, etc.
         type: tosca.capabilities.nfv.Metric
     #requirements:
       # ARIA NOTE: virtual_storage is TBD
-      
+
       # ARIA NOTE: csd04 attempts to deprecate the inherited local_storage 
requirement, but this
       # is not possible in TOSCA
     artifacts:

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/531b6006/extensions/aria_extension_tosca/simple_v1_0/data_types.py
----------------------------------------------------------------------
diff --git a/extensions/aria_extension_tosca/simple_v1_0/data_types.py 
b/extensions/aria_extension_tosca/simple_v1_0/data_types.py
index 513b517..216f1e4 100644
--- a/extensions/aria_extension_tosca/simple_v1_0/data_types.py
+++ b/extensions/aria_extension_tosca/simple_v1_0/data_types.py
@@ -163,7 +163,7 @@ class Version(object):
     #TYPE_TOSCA_VERSION>`__
     """
 
-    REGULAR = \
+    REGEX = \
         r'^(?P<major>\d+)\.(?P<minor>\d+)(\.(?P<fix>\d+)' + \
         r'((\.(?P<qualifier>\d+))(\-(?P<build>\d+))?)?)?$'
 
@@ -176,7 +176,7 @@ class Version(object):
 
     def __init__(self, entry_schema, constraints, value, aspect): # pylint: 
disable=unused-argument
         str_value = str(value)
-        match = re.match(Version.REGULAR, str_value)
+        match = re.match(Version.REGEX, str_value)
         if match is None:
             raise ValueError(
                 'version must be formatted as <major_version>.<minor_version>'
@@ -376,11 +376,14 @@ class Scalar(object):
 
     def __init__(self, entry_schema, constraints, value, aspect): # pylint: 
disable=unused-argument
         str_value = str(value)
-        match = re.match(self.REGULAR, str_value) # pylint: disable=no-member
+        match = re.match(self.REGEX, str_value) # pylint: disable=no-member
         if match is None:
             raise ValueError('scalar must be formatted as <scalar> <unit>: %s' 
% safe_repr(value))
 
         self.factor = float(match.group('scalar'))
+        if self.factor < 0:
+            raise ValueError('scalar is negative: %s' % safe_repr(self.factor))
+
         self.unit = match.group('unit')
 
         unit_lower = self.unit.lower()
@@ -435,7 +438,7 @@ class ScalarSize(Scalar):
     """
 
     # See: http://www.regular-expressions.info/floatingpoint.html
-    REGULAR = \
+    REGEX = \
         
r'^(?P<scalar>[0-9]*\.?[0-9]+([eE][-+]?[0-9]+)?)\s*(?P<unit>B|kB|KiB|MB|MiB|GB|GiB|TB|TiB)$'
 
     UNITS = {
@@ -464,7 +467,7 @@ class ScalarTime(Scalar):
     """
 
     # See: http://www.regular-expressions.info/floatingpoint.html
-    REGULAR = 
r'^(?P<scalar>[0-9]*\.?[0-9]+([eE][-+]?[0-9]+)?)\s*(?P<unit>ns|us|ms|s|m|h|d)$'
+    REGEX = 
r'^(?P<scalar>[0-9]*\.?[0-9]+([eE][-+]?[0-9]+)?)\s*(?P<unit>ns|us|ms|s|m|h|d)$'
 
     UNITS = {
         'ns':     0.000000001,
@@ -490,7 +493,7 @@ class ScalarFrequency(Scalar):
     """
 
     # See: http://www.regular-expressions.info/floatingpoint.html
-    REGULAR = 
r'^(?P<scalar>[0-9]*\.?[0-9]+([eE][-+]?[0-9]+)?)\s*(?P<unit>Hz|kHz|MHz|GHz)$'
+    REGEX = 
r'^(?P<scalar>[0-9]*\.?[0-9]+([eE][-+]?[0-9]+)?)\s*(?P<unit>Hz|kHz|MHz|GHz)$'
 
     UNITS = {
         'Hz':           1.0,

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/531b6006/extensions/aria_extension_tosca/simple_v1_0/modeling/capabilities.py
----------------------------------------------------------------------
diff --git 
a/extensions/aria_extension_tosca/simple_v1_0/modeling/capabilities.py 
b/extensions/aria_extension_tosca/simple_v1_0/modeling/capabilities.py
index 5427c7e..1b95bec 100644
--- a/extensions/aria_extension_tosca/simple_v1_0/modeling/capabilities.py
+++ b/extensions/aria_extension_tosca/simple_v1_0/modeling/capabilities.py
@@ -68,12 +68,14 @@ def get_inherited_capability_definitions(context, 
presentation, for_presentation
                 capability_definition = capability_definitions[capability_name]
 
                 # Check if we changed the type
-                type1 = capability_definition.type
-                type2 = our_capability_definition.type
-                if type1 != type2:
+                type1 = capability_definition._get_type(context)
+                type2 = our_capability_definition._get_type(context)
+
+                if not type1._is_descendant(context, type2):
                     context.validation.report(
-                        'capability definition changes type from "{0}" to 
"{1}" in "{2}"'
-                        .format(type1, type2, presentation._fullname),
+                        'capability definition type "{0}" is not a descendant 
of overridden '
+                        'capability definition type "{1}"' \
+                        .format(type1._name, type2._name),
                         locator=our_capability_definition._locator, 
level=Issue.BETWEEN_TYPES)
 
                 merge_capability_definition(context, presentation, 
capability_definition,
@@ -168,6 +170,8 @@ def merge_capability_definition(context, presentation, 
capability_definition,
                                 from_capability_definition):
     raw_properties = OrderedDict()
 
+    capability_definition._raw['type'] = from_capability_definition.type
+
     # Merge properties from type
     from_property_defintions = from_capability_definition.properties
     merge_raw_parameter_definitions(context, presentation, raw_properties, 
from_property_defintions,

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/531b6006/extensions/aria_extension_tosca/simple_v1_0/modeling/data_types.py
----------------------------------------------------------------------
diff --git a/extensions/aria_extension_tosca/simple_v1_0/modeling/data_types.py 
b/extensions/aria_extension_tosca/simple_v1_0/modeling/data_types.py
index 9dee0f2..13ce9a3 100644
--- a/extensions/aria_extension_tosca/simple_v1_0/modeling/data_types.py
+++ b/extensions/aria_extension_tosca/simple_v1_0/modeling/data_types.py
@@ -159,10 +159,6 @@ def get_data_type(context, presentation, field_name, 
allow_none=False):
         else:
             return str
 
-    # Make sure not derived from self
-    if type_name == presentation._name:
-        return None
-
     # Avoid circular definitions
     container_data_type = get_container_data_type(presentation)
     if (container_data_type is not None) and (container_data_type._name == 
type_name):

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/531b6006/extensions/aria_extension_tosca/simple_v1_0/modeling/functions.py
----------------------------------------------------------------------
diff --git a/extensions/aria_extension_tosca/simple_v1_0/modeling/functions.py 
b/extensions/aria_extension_tosca/simple_v1_0/modeling/functions.py
index 590c6a0..ecbfde9 100644
--- a/extensions/aria_extension_tosca/simple_v1_0/modeling/functions.py
+++ b/extensions/aria_extension_tosca/simple_v1_0/modeling/functions.py
@@ -200,20 +200,24 @@ class GetProperty(Function):
         for modelable_entity in modelable_entities:
             properties = None
 
+            # First argument refers to a requirement template?
             if hasattr(modelable_entity, 'requirement_templates') \
                 and modelable_entity.requirement_templates \
                 and (req_or_cap_name in [v.name for v in 
modelable_entity.requirement_templates]):
-                for requirement_template in 
modelable_entity.requirement_templates:
-                    if requirement_template.name == req_or_cap_name:
-                        # First argument refers to a requirement
-                        # TODO: should follow to matched capability in other 
node...
+                for requirement in modelable_entity.requirement_templates:
+                    if requirement.name == req_or_cap_name:
+                        # TODO
                         raise CannotEvaluateFunctionException()
-                        # break
+            # First argument refers to a capability?
+            elif hasattr(modelable_entity, 'capabilities') \
+                and modelable_entity.capabilities \
+                and (req_or_cap_name in modelable_entity.capabilities):
+                properties = 
modelable_entity.capabilities[req_or_cap_name].properties
                 nested_property_name_or_index = 
self.nested_property_name_or_index[1:]
+            # First argument refers to a capability template?
             elif hasattr(modelable_entity, 'capability_templates') \
                 and modelable_entity.capability_templates \
                 and (req_or_cap_name in modelable_entity.capability_templates):
-                # First argument refers to a capability
                 properties = 
modelable_entity.capability_templates[req_or_cap_name].properties
                 nested_property_name_or_index = 
self.nested_property_name_or_index[1:]
             else:
@@ -640,7 +644,7 @@ def get_target(container_holder, name, locator):
 
 def get_modelable_entity_parameter(modelable_entity, parameters, 
nested_parameter_name_or_index):
     if not parameters:
-        return False, True, None
+        return Evaluation(None, True)
 
     found = True
     final = True

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/531b6006/extensions/aria_extension_tosca/simple_v1_0/modeling/interfaces.py
----------------------------------------------------------------------
diff --git a/extensions/aria_extension_tosca/simple_v1_0/modeling/interfaces.py 
b/extensions/aria_extension_tosca/simple_v1_0/modeling/interfaces.py
index fffd5c1..23a03b7 100644
--- a/extensions/aria_extension_tosca/simple_v1_0/modeling/interfaces.py
+++ b/extensions/aria_extension_tosca/simple_v1_0/modeling/interfaces.py
@@ -400,13 +400,15 @@ def merge_raw_operation_definitions(context, 
raw_operations, our_operations, int
 def merge_interface_definition(context, interface, our_source, presentation, 
type_name):
     if hasattr(our_source, 'type'):
         # Check if we changed the interface type
-        input_type1 = interface.type
-        input_type2 = our_source.type
-        if (input_type1 is not None) and (input_type2 is not None) and 
(input_type1 != input_type2):
+        type1 = interface._get_type(context)
+        type2 = our_source._get_type(context)
+
+        if (type2 is not None) and not type1._is_descendant(context, type2):
             context.validation.report(
-                'interface definition "%s" changes type from "%s" to "%s" in 
"%s"'
-                % (interface._name, input_type1, input_type2, 
presentation._fullname),
-                locator=input_type2._locator, level=Issue.BETWEEN_TYPES)
+                'interface definition type "{0}" is not a descendant of 
overridden '
+                'interface definition type "{1}"' \
+                .format(type1._name, type2._name),
+                locator=our_source._locator, level=Issue.BETWEEN_TYPES)
 
     # Add/merge inputs
     our_interface_inputs = our_source._get_inputs(context) \

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/531b6006/extensions/aria_extension_tosca/simple_v1_0/modeling/parameters.py
----------------------------------------------------------------------
diff --git a/extensions/aria_extension_tosca/simple_v1_0/modeling/parameters.py 
b/extensions/aria_extension_tosca/simple_v1_0/modeling/parameters.py
index f271b4d..5c14ad2 100644
--- a/extensions/aria_extension_tosca/simple_v1_0/modeling/parameters.py
+++ b/extensions/aria_extension_tosca/simple_v1_0/modeling/parameters.py
@@ -18,7 +18,8 @@ from aria.utils.formatting import pluralize
 from aria.parser.presentation import Value
 from aria.parser.validation import Issue
 
-from .data_types import coerce_value
+from .data_types import (coerce_value, get_primitive_data_type)
+from ..presentation.types import get_type_by_name
 
 
 #
@@ -149,16 +150,22 @@ def validate_required_values(context, presentation, 
values, definitions):
 
 def merge_raw_parameter_definition(context, presentation, 
raw_property_definition,
                                    our_property_definition, field_name, 
property_name):
-    # Check if we changed the type
-    # TODO: allow a sub-type?
-    type1 = raw_property_definition.get('type')
-    type2 = our_property_definition.type
+    # Check if we changed the parameter type
+    type1_name = raw_property_definition.get('type')
+    type1 = get_type_by_name(context, type1_name, 'data_types')
+    if type1 is None:
+        type1 = get_primitive_data_type(type1_name)
+    our_property_definition._reset_method_cache()
+    type2 = our_property_definition._get_type(context)
+
     if type1 != type2:
-        context.validation.report(
-            'override changes type from "%s" to "%s" for property "%s" in "%s"'
-            % (type1, type2, property_name, presentation._fullname),
-            locator=presentation._get_child_locator(field_name, property_name),
-            level=Issue.BETWEEN_TYPES)
+        if not hasattr(type1, '_is_descendant') or not 
type1._is_descendant(context, type2):
+            context.validation.report(
+                'property definition type "{0}" is not a descendant of 
overridden '
+                'property definition type "{1}"' \
+                .format(type1_name, type2._name),
+                locator=presentation._get_child_locator(field_name, 
property_name),
+                level=Issue.BETWEEN_TYPES)
 
     merge(raw_property_definition, our_property_definition._raw)
 

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/531b6006/extensions/aria_extension_tosca/simple_v1_0/presentation/types.py
----------------------------------------------------------------------
diff --git a/extensions/aria_extension_tosca/simple_v1_0/presentation/types.py 
b/extensions/aria_extension_tosca/simple_v1_0/presentation/types.py
index 920ebed..5f9750e 100644
--- a/extensions/aria_extension_tosca/simple_v1_0/presentation/types.py
+++ b/extensions/aria_extension_tosca/simple_v1_0/presentation/types.py
@@ -18,7 +18,8 @@ def convert_name_to_full_type_name(context, name, 
types_dict): # pylint: disable
     """
     Converts a type name to its full type name, or else returns it unchanged.
 
-    Works by checking for ``shorthand_name`` in the types' ``_extensions`` 
field. See also
+    Works by checking for ``shorthand_name`` and ``type_qualified_name`` in 
the types'
+    ``_extensions`` field. See also
     
:class:`aria_extension_tosca.v1_0.presentation.extensible.ExtensiblePresentation`.
 
     Can be used as the conversion function argument in ``type_validator`` and
@@ -36,9 +37,10 @@ def convert_name_to_full_type_name(context, name, 
types_dict): # pylint: disable
 
 def get_type_by_name(context, name, *types_dict_names):
     """
-    Gets a type either by its full name or its shorthand name or typequalified 
name.
+    Gets a type either by its full name or its shorthand name or 
type-qualified name.
 
-    Works by checking for ``shorthand_name`` in the types' ``_extensions`` 
field. See also
+    Works by checking for ``shorthand_name`` and ``type_qualified_name`` in 
the types'
+    ``_extensions`` field. See also
     
:class:`~aria_extension_tosca.v1_0.presentation.extensible.ExtensiblePresentation`.
 
     The arguments from the third onwards are used to locate a nested field 
under

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/531b6006/extensions/aria_extension_tosca/simple_v1_0/types.py
----------------------------------------------------------------------
diff --git a/extensions/aria_extension_tosca/simple_v1_0/types.py 
b/extensions/aria_extension_tosca/simple_v1_0/types.py
index 787aac2..b662a20 100644
--- a/extensions/aria_extension_tosca/simple_v1_0/types.py
+++ b/extensions/aria_extension_tosca/simple_v1_0/types.py
@@ -193,6 +193,17 @@ class DataType(ExtensiblePresentation):
         return get_data_type(context, self, 'derived_from', allow_none=True)
 
     @cachedmethod
+    def _is_descendant(self, context, the_type):
+        if the_type is None:
+            return False
+        if not hasattr(the_type, '_name'):
+            # Must be a primitive type
+            return self._get_primitive_ancestor(context) == the_type
+        if the_type._name == self._name:
+            return True
+        return self._is_descendant(context, the_type._get_parent(context))
+
+    @cachedmethod
     def _get_primitive_ancestor(self, context):
         parent = self._get_parent(context)
         if parent is not None:
@@ -387,6 +398,14 @@ class InterfaceType(ExtensiblePresentation):
                                        'interface_types')
 
     @cachedmethod
+    def _is_descendant(self, context, the_type):
+        if the_type is None:
+            return False
+        elif the_type._name == self._name:
+            return True
+        return self._is_descendant(context, the_type._get_parent(context))
+
+    @cachedmethod
     def _get_inputs(self, context):
         return FrozenDict(get_inherited_parameter_definitions(context, self, 
'inputs'))
 

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/531b6006/tests/end2end/test_hello_world.py
----------------------------------------------------------------------
diff --git a/tests/end2end/test_hello_world.py 
b/tests/end2end/test_hello_world.py
index 5e4d7fd..094ffc3 100644
--- a/tests/end2end/test_hello_world.py
+++ b/tests/end2end/test_hello_world.py
@@ -20,7 +20,7 @@ from .. import helpers
 
 
 def test_hello_world(testenv):
-    hello_world_template_uri = helpers.get_example_uri('hello-world', 
'helloworld.yaml')
+    hello_world_template_uri = helpers.get_example_uri('hello-world', 
'hello-world.yaml')
     service_name = testenv.install_service(hello_world_template_uri)
 
     try:

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/531b6006/tests/resources/service-templates/tosca-simple-1.0/node-cellar/node-cellar.yaml
----------------------------------------------------------------------
diff --git 
a/tests/resources/service-templates/tosca-simple-1.0/node-cellar/node-cellar.yaml
 
b/tests/resources/service-templates/tosca-simple-1.0/node-cellar/node-cellar.yaml
index 5a46532..260f0bf 100644
--- 
a/tests/resources/service-templates/tosca-simple-1.0/node-cellar/node-cellar.yaml
+++ 
b/tests/resources/service-templates/tosca-simple-1.0/node-cellar/node-cellar.yaml
@@ -89,7 +89,7 @@ topology_template:
       value: *DEFAULT_OPENSTACK_CREDENTIAL
 
   node_templates:
-  
+
     # Application
 
     node_cellar:
@@ -135,7 +135,7 @@ topology_template:
           properties:
             protocol: udp
             url_path: /nodecellar
-    
+
     node_cellar_database:
       description: >-
         Node Cellar MongoDB database.
@@ -151,7 +151,7 @@ topology_template:
           repository: node_cellar
 
     # Server software
-    
+
     nodejs:
       description: >-
         Node.js instance.
@@ -202,7 +202,7 @@ topology_template:
     loadbalancer:
       type: nginx.LoadBalancer
       properties:
-        algorithm: round-robin   
+        algorithm: round-robin
 
     # Hosts
 
@@ -273,7 +273,7 @@ topology_template:
           create: create_data_volume.sh
 
   groups:
-  
+
     node_cellar_group:
       type: openstack.Secured
       members:
@@ -286,7 +286,7 @@ topology_template:
             openstack_credential: { get_input: openstack_credential }
 
   policies:
-  
+
     app_scaling:
       type: aria.Scaling
       properties:
@@ -295,7 +295,7 @@ topology_template:
       targets:
         - node_cellar
         - nodejs
-  
+
     host_scaling:
       type: openstack.Scaling
       properties:
@@ -304,7 +304,7 @@ topology_template:
         default_instances: 2
       targets: # node templates or groups
         - node_cellar_group
-    
+
     juju:
       description: >-
         Juju plugin executes charms.
@@ -345,7 +345,7 @@ policy_types:
     description: >-
       Workflow to put all nodes in/out of maintenance mode. For web servers, 
this will show a "this
       site is under maintenance and we'll be back soon" web page. Database 
nodes will then close all
-      client connections cleanly and shut down services. 
+      client connections cleanly and shut down services.
     derived_from: aria.Workflow
     properties:
       implementation:

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/531b6006/tests/resources/service-templates/tosca-simple-1.0/node-cellar/types/mongodb.yaml
----------------------------------------------------------------------
diff --git 
a/tests/resources/service-templates/tosca-simple-1.0/node-cellar/types/mongodb.yaml
 
b/tests/resources/service-templates/tosca-simple-1.0/node-cellar/types/mongodb.yaml
index 34d0a9d..7031252 100644
--- 
a/tests/resources/service-templates/tosca-simple-1.0/node-cellar/types/mongodb.yaml
+++ 
b/tests/resources/service-templates/tosca-simple-1.0/node-cellar/types/mongodb.yaml
@@ -44,7 +44,7 @@ node_types:
   mongodb.Database:
     description: >-
       MongoDB database.
-      
+
       Supports importing database data if a mongodb.DatabaseDump is provided.
     derived_from: tosca.nodes.Database
     interfaces:

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/531b6006/tests/resources/service-templates/tosca-simple-1.0/node-cellar/types/nodejs.yaml
----------------------------------------------------------------------
diff --git 
a/tests/resources/service-templates/tosca-simple-1.0/node-cellar/types/nodejs.yaml
 
b/tests/resources/service-templates/tosca-simple-1.0/node-cellar/types/nodejs.yaml
index 19cc7b9..2b4d451 100644
--- 
a/tests/resources/service-templates/tosca-simple-1.0/node-cellar/types/nodejs.yaml
+++ 
b/tests/resources/service-templates/tosca-simple-1.0/node-cellar/types/nodejs.yaml
@@ -30,7 +30,7 @@ node_types:
         file: https://nodejs.org/dist/v4.4.7/node-v4.4.7-linux-x64.tar.xz
         deploy_path: /opt/nodejs
     capabilities:
-      data_endpoint: # @override 
+      data_endpoint: # @override
         type: tosca.capabilities.Endpoint
         properties:
           port:

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/531b6006/tests/resources/service-templates/tosca-simple-1.0/node-cellar/types/openstack.yaml
----------------------------------------------------------------------
diff --git 
a/tests/resources/service-templates/tosca-simple-1.0/node-cellar/types/openstack.yaml
 
b/tests/resources/service-templates/tosca-simple-1.0/node-cellar/types/openstack.yaml
index 99ee902..6941c1a 100644
--- 
a/tests/resources/service-templates/tosca-simple-1.0/node-cellar/types/openstack.yaml
+++ 
b/tests/resources/service-templates/tosca-simple-1.0/node-cellar/types/openstack.yaml
@@ -31,7 +31,7 @@ node_types:
 
       You may assign an image_id or attach an openstack.Image artifact (the 
artifact
       will take precedence).
-    
+
       You may assign either flavor_id or flavor_name (flavor_id will take 
precedence).
       If neither are assigned, flavor_name has a default value.
     derived_from: tosca.nodes.Compute
@@ -87,7 +87,7 @@ node_types:
   openstack.Volume:
     description: >-
       OpenStack volume.
-      
+
       See: http://developer.openstack.org/api-ref-blockstorage-v2.html
     derived_from: tosca.nodes.BlockStorage
     properties:

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/531b6006/tests/resources/service-templates/tosca-simple-1.0/types/shorthand-1/shorthand-1.yaml
----------------------------------------------------------------------
diff --git 
a/tests/resources/service-templates/tosca-simple-1.0/types/shorthand-1/shorthand-1.yaml
 
b/tests/resources/service-templates/tosca-simple-1.0/types/shorthand-1/shorthand-1.yaml
index b295f95..bb5a84e 100644
--- 
a/tests/resources/service-templates/tosca-simple-1.0/types/shorthand-1/shorthand-1.yaml
+++ 
b/tests/resources/service-templates/tosca-simple-1.0/types/shorthand-1/shorthand-1.yaml
@@ -6,17 +6,17 @@ description: >-
 topology_template:
 
   node_templates:
-  
+
     my_server:
       type: Compute
       requirements:
         - local_storage:
-            node: my_block_storage           
+            node: my_block_storage
             relationship:
               type: AttachesTo
               properties:
                 location: /path1/path2
-  
+
     my_block_storage:
       type: BlockStorage
       properties:

http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/531b6006/tests/resources/service-templates/tosca-simple-1.0/types/typequalified-1/typequalified-1.yaml
----------------------------------------------------------------------
diff --git 
a/tests/resources/service-templates/tosca-simple-1.0/types/typequalified-1/typequalified-1.yaml
 
b/tests/resources/service-templates/tosca-simple-1.0/types/typequalified-1/typequalified-1.yaml
index 5f11fd4..b54604f 100644
--- 
a/tests/resources/service-templates/tosca-simple-1.0/types/typequalified-1/typequalified-1.yaml
+++ 
b/tests/resources/service-templates/tosca-simple-1.0/types/typequalified-1/typequalified-1.yaml
@@ -6,17 +6,17 @@ description: >-
 topology_template:
 
   node_templates:
-  
+
     my_server:
       type: tosca:Compute
       requirements:
         - local_storage:
-            node: my_block_storage           
+            node: my_block_storage
             relationship:
               type: AttachesTo
               properties:
                 location: /path1/path2
-  
+
     my_block_storage:
       type: tosca:BlockStorage
       properties:

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