diff --git a/toscaparser/common/exception.py b/toscaparser/common/exception.py
index 4f99dda2..bd0ed9cf 100644
--- a/toscaparser/common/exception.py
+++ b/toscaparser/common/exception.py
@@ -88,6 +88,15 @@ class InvalidTypeError(TOSCAException):
     msg_fmt = _('Type "%(what)s" is not a valid type.')
 
 
+class InvalidTypeAdditionalRequirementsError(TOSCAException):
+    msg_fmt = _('Additional requirements for type "%(type)s" not met.')
+
+
+class RangeValueError(TOSCAException):
+    msg_fmt = _('The value "%(pvalue)s" of property "%(pname)s" is out of '
+                'range "(min:%(vmin)s, max:%(vmax)s)".')
+
+
 class InvalidSchemaError(TOSCAException):
     msg_fmt = _('%(message)s')
 
diff --git a/toscaparser/dataentity.py b/toscaparser/dataentity.py
index 6e7d59e4..ebca9292 100644
--- a/toscaparser/dataentity.py
+++ b/toscaparser/dataentity.py
@@ -16,10 +16,10 @@ from toscaparser.common.exception import TypeMismatchError
 from toscaparser.common.exception import UnknownFieldError
 from toscaparser.elements.constraints import Schema
 from toscaparser.elements.datatype import DataType
+from toscaparser.elements.portspectype import PortSpec
 from toscaparser.elements.scalarunit import ScalarUnit_Frequency
 from toscaparser.elements.scalarunit import ScalarUnit_Size
 from toscaparser.elements.scalarunit import ScalarUnit_Time
-
 from toscaparser.utils.gettextutils import _
 from toscaparser.utils import validateutils
 
@@ -27,11 +27,13 @@ from toscaparser.utils import validateutils
 class DataEntity(object):
     '''A complex data value entity.'''
 
-    def __init__(self, datatypename, value_dict, custom_def=None):
+    def __init__(self, datatypename, value_dict, custom_def=None,
+                 prop_name=None):
         self.custom_def = custom_def
         self.datatype = DataType(datatypename, custom_def)
         self.schema = self.datatype.get_all_properties()
         self.value = value_dict
+        self.property_name = prop_name
 
     def validate(self):
         '''Validate the value by the definition of the datatype.'''
@@ -43,7 +45,7 @@ class DataEntity(object):
                                                       self.value,
                                                       None,
                                                       self.custom_def)
-            schema = Schema(None, self.datatype.defs)
+            schema = Schema(self.property_name, self.datatype.defs)
             for constraint in schema.constraints:
                 constraint.validate(self.value)
         # If the datatype has 'properties' definition
@@ -110,7 +112,8 @@ class DataEntity(object):
             return self.schema[name].schema
 
     @staticmethod
-    def validate_datatype(type, value, entry_schema=None, custom_def=None):
+    def validate_datatype(type, value, entry_schema=None, custom_def=None,
+                          prop_name=None):
         '''Validate value with given type.
 
         If type is list or map, validate its entry by entry_schema(if defined)
@@ -123,7 +126,7 @@ class DataEntity(object):
         elif type == Schema.FLOAT:
             return validateutils.validate_float(value)
         elif type == Schema.NUMBER:
-            return validateutils.validate_number(value)
+            return validateutils.validate_numeric(value)
         elif type == Schema.BOOLEAN:
             return validateutils.validate_boolean(value)
         elif type == Schema.RANGE:
@@ -149,6 +152,10 @@ class DataEntity(object):
             if entry_schema:
                 DataEntity.validate_entry(value, entry_schema, custom_def)
             return value
+        elif type == Schema.PORTSPEC:
+            # TODO(TBD) bug 1567063, validate source & target as PortDef type
+            # as complex types not just as integers
+            PortSpec.validate_additional_req(value, prop_name, custom_def)
         else:
             data = DataEntity(type, value, custom_def)
             return data.validate()
diff --git a/toscaparser/elements/capabilitytype.py b/toscaparser/elements/capabilitytype.py
index 04134436..02c7fee3 100644
--- a/toscaparser/elements/capabilitytype.py
+++ b/toscaparser/elements/capabilitytype.py
@@ -16,6 +16,7 @@ from toscaparser.elements.statefulentitytype import StatefulEntityType
 
 class CapabilityTypeDef(StatefulEntityType):
     '''TOSCA built-in capabilities type.'''
+    TOSCA_TYPEURI_CAPABILITY_ROOT = 'tosca.capabilities.Root'
 
     def __init__(self, name, ctype, ntype, custom_def=None):
         self.name = name
@@ -61,7 +62,7 @@ class CapabilityTypeDef(StatefulEntityType):
         capabilities = {}
         parent_cap = self.parent_type
         if parent_cap:
-            while parent_cap != 'tosca.capabilities.Root':
+            while parent_cap != self.TOSCA_TYPEURI_CAPABILITY_ROOT:
                 if parent_cap in self.TOSCA_DEF.keys():
                     capabilities[parent_cap] = self.TOSCA_DEF[parent_cap]
                 elif custom_def and parent_cap in custom_def.keys():
diff --git a/toscaparser/elements/constraints.py b/toscaparser/elements/constraints.py
index 9883da3d..8594b851 100644
--- a/toscaparser/elements/constraints.py
+++ b/toscaparser/elements/constraints.py
@@ -18,6 +18,7 @@ import toscaparser
 from toscaparser.common.exception import ExceptionCollector
 from toscaparser.common.exception import InvalidSchemaError
 from toscaparser.common.exception import ValidationError
+from toscaparser.elements.portspectype import PortSpec
 from toscaparser.elements import scalarunit
 from toscaparser.utils.gettextutils import _
 
@@ -36,12 +37,12 @@ class Schema(collections.Mapping):
         INTEGER, STRING, BOOLEAN, FLOAT, RANGE,
         NUMBER, TIMESTAMP, LIST, MAP,
         SCALAR_UNIT_SIZE, SCALAR_UNIT_FREQUENCY, SCALAR_UNIT_TIME,
-        PORTDEF, VERSION
+        VERSION, PORTDEF, PORTSPEC
     ) = (
         'integer', 'string', 'boolean', 'float', 'range',
         'number', 'timestamp', 'list', 'map',
         'scalar-unit.size', 'scalar-unit.frequency', 'scalar-unit.time',
-        'PortDef', 'version'
+        'version', 'PortDef', PortSpec.SHORTNAME
     )
 
     SCALAR_UNIT_SIZE_DEFAULT = 'B'
@@ -127,8 +128,6 @@ class Constraint(object):
                    'less_or_equal', 'in_range', 'valid_values', 'length',
                    'min_length', 'max_length', 'pattern')
 
-    UNBOUNDED = 'UNBOUNDED'
-
     def __new__(cls, property_name, property_type, constraint):
         if cls is not Constraint:
             return super(Constraint, cls).__new__(cls)
@@ -370,6 +369,7 @@ class InRange(Constraint):
     Constrains a property or parameter to a value in range of (inclusive)
     the two values declared.
     """
+    UNBOUNDED = 'UNBOUNDED'
 
     constraint_key = Constraint.IN_RANGE
 
diff --git a/toscaparser/elements/datatype.py b/toscaparser/elements/datatype.py
index 7e05a695..93d1b3a2 100644
--- a/toscaparser/elements/datatype.py
+++ b/toscaparser/elements/datatype.py
@@ -18,7 +18,8 @@ class DataType(StatefulEntityType):
     '''TOSCA built-in and user defined complex data type.'''
 
     def __init__(self, datatypename, custom_def=None):
-        super(DataType, self).__init__(datatypename, self.DATATYPE_PREFIX,
+        super(DataType, self).__init__(datatypename,
+                                       self.DATATYPE_NETWORK_PREFIX,
                                        custom_def)
         self.custom_def = custom_def
 
diff --git a/toscaparser/elements/entity_type.py b/toscaparser/elements/entity_type.py
index 5d620a5a..af2b792a 100644
--- a/toscaparser/elements/entity_type.py
+++ b/toscaparser/elements/entity_type.py
@@ -56,7 +56,8 @@ class EntityType(object):
     GROUP_PREFIX = 'tosca.groups.'
     # currently the data types are defined only for network
     # but may have changes in the future.
-    DATATYPE_PREFIX = 'tosca.datatypes.network.'
+    DATATYPE_PREFIX = 'tosca.datatypes.'
+    DATATYPE_NETWORK_PREFIX = DATATYPE_PREFIX + 'network.'
     TOSCA = 'tosca'
 
     def derived_from(self, defs):
diff --git a/toscaparser/elements/portspectype.py b/toscaparser/elements/portspectype.py
new file mode 100644
index 00000000..d32e97e6
--- /dev/null
+++ b/toscaparser/elements/portspectype.py
@@ -0,0 +1,86 @@
+#    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.
+
+import logging
+
+from toscaparser.common.exception import ExceptionCollector
+from toscaparser.common.exception import InvalidTypeAdditionalRequirementsError
+from toscaparser.utils.gettextutils import _
+import toscaparser.utils.validateutils as validateutils
+
+log = logging.getLogger('tosca')
+
+
+class PortSpec(object):
+    '''Parent class for tosca.datatypes.network.PortSpec type.'''
+
+    SHORTNAME = 'PortSpec'
+    TYPE_URI = 'tosca.datatypes.network.' + SHORTNAME
+
+    PROPERTY_NAMES = (
+        PROTOCOL, SOURCE, SOURCE_RANGE,
+        TARGET, TARGET_RANGE
+    ) = (
+        'protocol', 'source', 'source_range',
+        'target', 'target_range'
+    )
+
+    # TODO(TBD) May want to make this a subclass of DataType
+    # and change init method to set PortSpec's properties
+    def __init__(self):
+        pass
+
+    # The following additional requirements MUST be tested:
+    # 1) A valid PortSpec MUST have at least one of the following properties:
+    #   target, target_range, source or source_range.
+    # 2) A valid PortSpec MUST have a value for the source property that
+    #    is within the numeric range specified by the property source_range
+    #    when source_range is specified.
+    # 3) A valid PortSpec MUST have a value for the target property that is
+    #    within the numeric range specified by the property target_range
+    #    when target_range is specified.
+    @staticmethod
+    def validate_additional_req(properties, prop_name, custom_def=None, ):
+        try:
+            source = properties.get(PortSpec.SOURCE)
+            source_range = properties.get(PortSpec.SOURCE_RANGE)
+            target = properties.get(PortSpec.TARGET)
+            target_range = properties.get(PortSpec.TARGET_RANGE)
+
+            # verify one of the specified values is set
+            if source is None and source_range is None and \
+                target is None and target_range is None:
+                ExceptionCollector.appendException(
+                    InvalidTypeAdditionalRequirementsError(
+                        type=PortSpec.TYPE_URI))
+            # Validate source value is in specified range
+            if source and source_range:
+                validateutils.validate_value_in_range(source, source_range,
+                                                      PortSpec.SOURCE)
+            else:
+                from toscaparser.dataentity import DataEntity
+                portdef = DataEntity('PortDef', source, None, PortSpec.SOURCE)
+                portdef.validate()
+            # Validate target value is in specified range
+            if target and target_range:
+                validateutils.validate_value_in_range(target, target_range,
+                                                      PortSpec.TARGET)
+            else:
+                from toscaparser.dataentity import DataEntity
+                portdef = DataEntity('PortDef', source, None, PortSpec.TARGET)
+                portdef.validate()
+        except Exception:
+            msg = _('"%(value)s" do not meet requirements '
+                    'for type "%(type)s".') \
+                % {'value': properties, 'type': PortSpec.SHORTNAME}
+            ExceptionCollector.appendException(
+                ValueError(msg))
diff --git a/toscaparser/parameters.py b/toscaparser/parameters.py
index 983aee30..a58f6a01 100644
--- a/toscaparser/parameters.py
+++ b/toscaparser/parameters.py
@@ -68,13 +68,16 @@ class Input(object):
             ExceptionCollector.appendException(
                 ValueError(_('Invalid type "%s".') % type))
 
+    # TODO(anyone) Need to test for any built-in datatype not just network
+    # that is, tosca.datatypes.* and not assume tosca.datatypes.network.*
+    # TODO(anyone) Add support for tosca.datatypes.Credential
     def _validate_value(self, value):
         tosca = EntityType.TOSCA_DEF
         datatype = None
         if self.type in tosca:
             datatype = tosca[self.type]
-        elif EntityType.DATATYPE_PREFIX + self.type in tosca:
-            datatype = tosca[EntityType.DATATYPE_PREFIX + self.type]
+        elif EntityType.DATATYPE_NETWORK_PREFIX + self.type in tosca:
+            datatype = tosca[EntityType.DATATYPE_NETWORK_PREFIX + self.type]
 
         DataEntity.validate_datatype(self.type, value, None, datatype)
 
diff --git a/toscaparser/properties.py b/toscaparser/properties.py
index 23c1db23..c69b1516 100644
--- a/toscaparser/properties.py
+++ b/toscaparser/properties.py
@@ -67,7 +67,8 @@ class Property(object):
                 self.value = str(self.value)
             self.value = DataEntity.validate_datatype(self.type, self.value,
                                                       self.entry_schema,
-                                                      self.custom_def)
+                                                      self.custom_def,
+                                                      self.name)
             self._validate_constraints()
 
     def _validate_constraints(self):
diff --git a/toscaparser/tests/data/datatypes/test_datatype_portspec_add_req.yaml b/toscaparser/tests/data/datatypes/test_datatype_portspec_add_req.yaml
new file mode 100644
index 00000000..f9449276
--- /dev/null
+++ b/toscaparser/tests/data/datatypes/test_datatype_portspec_add_req.yaml
@@ -0,0 +1,41 @@
+tosca_definitions_version: tosca_simple_yaml_1_0
+
+description: TOSCA test PortSpec Additional Requirement clauses
+
+node_types:
+
+  MyNodeType:
+    derived_from: Root
+    properties:
+      test_port:
+        type: PortSpec
+
+topology_template:
+
+  node_templates:
+
+    # Test invalid source value below (default) specified range constraint
+    test_node2:
+      type: MyNodeType
+      properties:
+        test_port:
+          protocol: tcp
+          source: 0
+
+    # Test invalid source value over specified range
+    test_node3:
+      type: MyNodeType
+      properties:
+        test_port:
+          protocol: tcp
+          source: 65535
+          source_range: [ 2, 65534 ]
+
+    # Test invalid source value under specified range
+    test_node4:
+      type: MyNodeType
+      properties:
+        test_port:
+          protocol: tcp
+          source: 1
+          source_range: [ 2, 65534 ]
diff --git a/toscaparser/tests/test_datatypes.py b/toscaparser/tests/test_datatypes.py
index 0e613b2a..58fb2fed 100644
--- a/toscaparser/tests/test_datatypes.py
+++ b/toscaparser/tests/test_datatypes.py
@@ -66,16 +66,21 @@ class DataTypeTest(TestCase):
 
     tosca.my.datatypes.TestLab:
       properties:
-        temperature:
-          type: range
-          required: false
-          constraints:
-            - in_range: [-256, UNBOUNDED]
         humidity:
           type: range
           required: false
           constraints:
             - in_range: [-256, INFINITY]
+        temperature1:
+          type: range
+          required: false
+          constraints:
+            - in_range: [-256, UNBOUNDED]
+        temperature2:
+          type: range
+          required: false
+          constraints:
+            - in_range: [UNBOUNDED, 256]
     '''
     custom_type_def = yamlparser.simple_parse(custom_type_schema)
 
@@ -84,15 +89,6 @@ class DataTypeTest(TestCase):
         value = yamlparser.simple_parse(value_snippet)
         self.assertEqual(value, {})
 
-    # TODO(Matt) - opened as bug 1555300
-    # Need a test for PortSpec normative data type
-    # that tests the spec. requirement: "A valid PortSpec
-    # must have at least one of the following properties:
-    # target, target_range, source or source_range."
-    # TODO(Matt) - opened as bug 1555310
-    # test PortSpec value for source and target
-    # against the source_range and target_range
-    # when specified.
     def test_built_in_datatype(self):
         value_snippet = '''
         private_network:
@@ -140,6 +136,31 @@ class DataTypeTest(TestCase):
         data = DataEntity('PortInfo', value.get('ethernet_port'))
         self.assertIsNotNone(data.validate())
 
+    # Test normative PortSpec datatype's additional requirements
+    # TODO(Matt) - opened as bug 1555300
+    # Need a test for PortSpec normative data type
+    # that tests the spec. requirement: "A valid PortSpec
+    # must have at least one of the following properties:
+    # target, target_range, source or source_range."
+    # TODO(Matt) - opened as bug 1555310
+    # test PortSpec value for source and target
+    # against the source_range and target_range
+    # when specified.
+    def test_port_spec_addl_reqs(self):
+        value_snippet = '''
+        test_port:
+          protocol: tcp
+          target: 65535
+          target_range: [ 1, 65535 ]
+          source: 1
+          source_range: [ 1, 65535 ]
+
+        '''
+        value = yamlparser.simple_parse(value_snippet)
+        data = DataEntity('tosca.datatypes.network.PortSpec',
+                          value.get('test_port'))
+        self.assertIsNotNone(data.validate())
+
     def test_built_in_datatype_without_properties(self):
         value_snippet = '''
         2
@@ -365,6 +386,7 @@ class DataTypeTest(TestCase):
         value_snippet = '''
         user_port:
           protocol: tcp
+          target: 1
           target_range: [20000]
         '''
         value = yamlparser.simple_parse(value_snippet)
@@ -377,6 +399,7 @@ class DataTypeTest(TestCase):
         value_snippet = '''
         user_port:
           protocol: tcp
+          target: 1
           target_range: [20000, 3000]
         '''
         value = yamlparser.simple_parse(value_snippet)
@@ -400,7 +423,55 @@ class DataTypeTest(TestCase):
 
     def test_range_unbounded(self):
         value_snippet = '''
-        temperature: [-100, 999999]
+        humidity: [-100, 100]
+        '''
+        value = yamlparser.simple_parse(value_snippet)
+        data = DataEntity('tosca.my.datatypes.TestLab',
+                          value, DataTypeTest.custom_type_def)
+        err = self.assertRaises(exception.InvalidSchemaError,
+                                lambda: data.validate())
+        self.assertEqual(_('The property "in_range" expects comparable values.'
+                           ),
+                         err.__str__())
+
+    def test_invalid_ranges_against_constraints(self):
+        # The TestLab range type has min=-256, max=UNBOUNDED
+        value_snippet = '''
+        temperature1: [-257, 999999]
+        '''
+        value = yamlparser.simple_parse(value_snippet)
+        data = DataEntity('tosca.my.datatypes.TestLab', value,
+                          DataTypeTest.custom_type_def)
+        err = self.assertRaises(exception.ValidationError, data.validate)
+        self.assertEqual(_('The value "-257" of property "temperature1" is '
+                           'out of range "(min:-256, max:UNBOUNDED)".'),
+                         err.__str__())
+
+        value_snippet = '''
+        temperature2: [-999999, 257]
+        '''
+        value = yamlparser.simple_parse(value_snippet)
+        data = DataEntity('tosca.my.datatypes.TestLab', value,
+                          DataTypeTest.custom_type_def)
+        err = self.assertRaises(exception.ValidationError, data.validate)
+        self.assertEqual(_('The value "257" of property "temperature2" is '
+                           'out of range "(min:UNBOUNDED, max:256)".'),
+                         err.__str__())
+
+    def test_valid_ranges_against_constraints(self):
+
+        # The TestLab range type has max=UNBOUNDED
+        value_snippet = '''
+        temperature1: [-255, 999999]
+        '''
+        value = yamlparser.simple_parse(value_snippet)
+        data = DataEntity('tosca.my.datatypes.TestLab', value,
+                          DataTypeTest.custom_type_def)
+        self.assertIsNotNone(data.validate())
+
+        # The TestLab range type has min=UNBOUNDED
+        value_snippet = '''
+        temperature2: [-999999, 255]
         '''
         value = yamlparser.simple_parse(value_snippet)
         data = DataEntity('tosca.my.datatypes.TestLab', value,
diff --git a/toscaparser/tests/test_toscatpl.py b/toscaparser/tests/test_toscatpl.py
index 3fd49bf8..b532f573 100644
--- a/toscaparser/tests/test_toscatpl.py
+++ b/toscaparser/tests/test_toscatpl.py
@@ -16,6 +16,7 @@ import six
 from toscaparser.common import exception
 import toscaparser.elements.interfaces as ifaces
 from toscaparser.elements.nodetype import NodeType
+from toscaparser.elements.portspectype import PortSpec
 from toscaparser.functions import GetInput
 from toscaparser.functions import GetProperty
 from toscaparser.nodetemplate import NodeTemplate
@@ -730,3 +731,40 @@ class ToscaTemplateTest(TestCase):
         rel = tosca.relationship_templates[0]
         self.assertEqual(len(rel.interfaces), 1)
         self.assertEqual(rel.interfaces[0].type, "Configure")
+
+    def test_various_portspec_errors(self):
+        tosca_tpl = os.path.join(
+            os.path.dirname(os.path.abspath(__file__)),
+            "data/datatypes/test_datatype_portspec_add_req.yaml")
+        self.assertRaises(exception.ValidationError, ToscaTemplate, tosca_tpl,
+                          None)
+
+        # TODO(TBD) find way to reuse error messages from constraints.py
+        msg = (_('The value "%(pvalue)s" of property "%(pname)s" is out of '
+                 'range "(min:%(vmin)s, max:%(vmax)s)".') %
+               dict(pname=PortSpec.SOURCE,
+                    pvalue='0',
+                    vmin='1',
+                    vmax='65535'))
+        exception.ExceptionCollector.assertExceptionMessage(
+            exception.ValidationError, msg)
+
+        # Test value below range min.
+        msg = (_('The value "%(pvalue)s" of property "%(pname)s" is out of '
+                 'range "(min:%(vmin)s, max:%(vmax)s)".') %
+               dict(pname=PortSpec.SOURCE,
+                    pvalue='1',
+                    vmin='2',
+                    vmax='65534'))
+        exception.ExceptionCollector.assertExceptionMessage(
+            exception.RangeValueError, msg)
+
+        # Test value above range max.
+        msg = (_('The value "%(pvalue)s" of property "%(pname)s" is out of '
+                 'range "(min:%(vmin)s, max:%(vmax)s)".') %
+               dict(pname=PortSpec.SOURCE,
+                    pvalue='65535',
+                    vmin='2',
+                    vmax='65534'))
+        exception.ExceptionCollector.assertExceptionMessage(
+            exception.RangeValueError, msg)
diff --git a/toscaparser/utils/validateutils.py b/toscaparser/utils/validateutils.py
index f9b9fc58..43e14d67 100644
--- a/toscaparser/utils/validateutils.py
+++ b/toscaparser/utils/validateutils.py
@@ -17,14 +17,20 @@ import numbers
 import re
 import six
 
+# from toscaparser.elements import constraints
 from toscaparser.common.exception import ExceptionCollector
 from toscaparser.common.exception import InvalidTOSCAVersionPropertyException
+from toscaparser.common.exception import RangeValueError
 from toscaparser.utils.gettextutils import _
+
 log = logging.getLogger('tosca')
 
+RANGE_UNBOUNDED = 'UNBOUNDED'
+
 
 def str_to_num(value):
     '''Convert a string representation of a number into a numeric type.'''
+    # TODO(TBD) we should not allow numeric values in, input should be str
     if isinstance(value, numbers.Number):
         return value
     try:
@@ -33,8 +39,11 @@ def str_to_num(value):
         return float(value)
 
 
-def validate_number(value):
-    return str_to_num(value)
+def validate_numeric(value):
+    if not isinstance(value, numbers.Number):
+        ExceptionCollector.appendException(
+            ValueError(_('"%s" is not a numeric.') % value))
+    return value
 
 
 def validate_integer(value):
@@ -51,7 +60,7 @@ def validate_float(value):
     if not isinstance(value, float):
         ExceptionCollector.appendException(
             ValueError(_('"%s" is not a float.') % value))
-    return validate_number(value)
+    return value
 
 
 def validate_string(value):
@@ -68,15 +77,53 @@ def validate_list(value):
     return value
 
 
-def validate_range(value):
-    validate_list(value)
-    if isinstance(value, list):
-        if len(value) != 2 or not (value[0] <= value[1]):
+def validate_range(range):
+    # list class check
+    validate_list(range)
+    # validate range list has a min and max
+    if len(range) != 2:
+        ExceptionCollector.appendException(
+            ValueError(_('"%s" is not a valid range.') % range))
+    # validate min and max are numerics or the keyword UNBOUNDED
+    min_test = max_test = False
+    if not range[0] == RANGE_UNBOUNDED:
+        min = validate_numeric(range[0])
+    else:
+        min_test = True
+    if not range[1] == RANGE_UNBOUNDED:
+        max = validate_numeric(range[1])
+    else:
+        max_test = True
+    # validate the max > min (account for UNBOUNDED)
+    if not min_test and not max_test:
+        # Note: min == max is allowed
+        if min > max:
             ExceptionCollector.appendException(
-                ValueError(_('"%s" is not a valid range.') % value))
-        validate_integer(value[0])
-        if not value[1] == "UNBOUNDED":
-            validate_integer(value[1])
+                ValueError(_('"%s" is not a valid range.') % range))
+
+    return range
+
+
+def validate_value_in_range(value, range, prop_name):
+    validate_numeric(value)
+    validate_range(range)
+
+    # Note: value is valid if equal to min
+    if range[0] != RANGE_UNBOUNDED:
+        if value < range[0]:
+            ExceptionCollector.appendException(
+                RangeValueError(pname=prop_name,
+                                pvalue=value,
+                                vmin=range[0],
+                                vmax=range[1]))
+    # Note: value is valid if equal to max
+    if range[1] != RANGE_UNBOUNDED:
+        if value > range[1]:
+            ExceptionCollector.appendException(
+                RangeValueError(pname=prop_name,
+                                pvalue=value,
+                                vmin=range[0],
+                                vmax=range[1]))
     return value