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diff --git a/azure/aria/aria-extension-cloudify/src/aria/aria/parser/modeling/context.py b/azure/aria/aria-extension-cloudify/src/aria/aria/parser/modeling/context.py
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+++ b/azure/aria/aria-extension-cloudify/src/aria/aria/parser/modeling/context.py
@@ -0,0 +1,107 @@
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You 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.
+
+import itertools
+
+from ...utils.collections import StrictDict, prune
+from ...utils.uuid import generate_uuid
+
+
+# See: http://www.faqs.org/rfcs/rfc1035.html
+ID_MAX_LENGTH = 63
+
+
+class IdType(object):
+    LOCAL_SERIAL = 0
+    """
+    Locally unique serial ID: a running integer.
+    """
+
+    LOCAL_RANDOM = 1
+    """
+    Locally unique ID: 6 random safe characters.
+    """
+
+    UNIVERSAL_RANDOM = 2
+    """
+    Universally unique ID (UUID): 22 random safe characters.
+    """
+
+
+class ModelingContext(object):
+    """
+    Modeling context.
+
+    :ivar template: generated service template
+    :vartype template: aria.modeling.models.ServiceTemplate
+    :ivar instance: generated service instance
+    :vartype instance: aria.modeling.models.Service
+    :ivar node_id_format: format for node instance IDs
+    :vartype node_id_format: basestring
+    :ivar id_type: type of IDs to use for instances
+    :vartype id_type: basestring
+    :ivar id_max_length: maximum allowed instance ID length
+    :vartype id_max_length: int
+    :ivar inputs: inputs values
+    :vartype inputs: {:obj:`basestring`, object}
+    """
+
+    def __init__(self):
+        self.template = None
+        self.instance = None
+        self.node_id_format = '{template}_{id}'
+        #self.id_type = IdType.LOCAL_SERIAL
+        #self.id_type = IdType.LOCAL_RANDOM
+        self.id_type = IdType.UNIVERSAL_RANDOM
+        self.id_max_length = ID_MAX_LENGTH
+        self.inputs = StrictDict(key_class=basestring)
+
+        self._serial_id_counter = itertools.count(1)
+        self._locally_unique_ids = set()
+
+    def store(self, model_storage):
+        if self.template is not None:
+            model_storage.service_template.put(self.template)
+        if self.instance is not None:
+            model_storage.service.put(self.instance)
+
+    def generate_id(self):
+        if self.id_type == IdType.LOCAL_SERIAL:
+            return self._serial_id_counter.next()
+
+        elif self.id_type == IdType.LOCAL_RANDOM:
+            the_id = generate_uuid(6)
+            while the_id in self._locally_unique_ids:
+                the_id = generate_uuid(6)
+            self._locally_unique_ids.add(the_id)
+            return the_id
+
+        return generate_uuid()
+
+    def set_input(self, name, value):
+        self.inputs[name] = value
+        # TODO: coerce to validate type
+
+    @property
+    def template_as_raw(self):
+        raw = self.template.as_raw
+        prune(raw)
+        return raw
+
+    @property
+    def instance_as_raw(self):
+        raw = self.instance.as_raw
+        prune(raw)
+        return raw