diff --git a/toscaparser/imports.py b/toscaparser/imports.py
index ab11adb5..5149382b 100644
--- a/toscaparser/imports.py
+++ b/toscaparser/imports.py
@@ -41,6 +41,9 @@ class ImportsLoader(object):
             log.warning(msg)
             ExceptionCollector.appendException(ValidationError(message=msg))
         self.path = path
+        self.repositories = {}
+        if tpl and tpl.get('repositories'):
+            self.repositories = tpl.get('repositories')
         self.type_definition_list = []
         if type_definition_list:
             if isinstance(type_definition_list, list):
@@ -153,10 +156,9 @@ class ImportsLoader(object):
             self._validate_import_keys(import_name, import_uri_def)
             file_name = import_uri_def.get(self.FILE)
             repository = import_uri_def.get(self.REPOSITORY)
-            namespace_uri = import_uri_def.get(self.NAMESPACE_URI)
         else:
             file_name = import_uri_def
-            namespace_uri = None
+            repository = None
             short_import_notation = True
 
         if not file_name:
@@ -169,7 +171,7 @@ class ImportsLoader(object):
 
         if toscaparser.utils.urlutils.UrlUtils.validate_url(file_name):
             return YAML_LOADER(file_name, False)
-        elif not namespace_uri:
+        elif not repository:
             import_template = None
             if self.path:
                 if toscaparser.utils.urlutils.UrlUtils.validate_url(self.path):
@@ -238,21 +240,31 @@ class ImportsLoader(object):
             log.error(_('Import "%(name)s" is not valid.') % import_uri_def)
             ExceptionCollector.appendException(
                 ImportError(_('Import "%s" is not valid.') % import_uri_def))
+            return
 
-        # Remove leading, ending spaces and strip the last character if "/"
-        namespace_uri = ((namespace_uri).strip()).rstrip("//")
+        full_url = ""
+        if repository:
+            if self.repositories:
+                for repo_name, repo_def in self.repositories.items():
+                    if repo_name == repository:
+                        # Remove leading, ending spaces and strip
+                        # the last character if "/"
+                        repo_url = ((repo_def['url']).strip()).rstrip("//")
+                        full_url = repo_url + "/" + file_name
 
-        if toscaparser.utils.urlutils.UrlUtils.validate_url(namespace_uri):
-            full_url = None
-            if repository:
-                repository = ((repository).strip()).rstrip("//")
-                full_url = namespace_uri + "/" + repository + "/" + file_name
-            else:
-                full_url = namespace_uri + "/" + file_name
+            if not full_url:
+                msg = (_('referenced repository "%(n_uri)s" in import '
+                         'definition "%(tpl)s" not found.')
+                       % {'n_uri': repository, 'tpl': import_name})
+                log.error(msg)
+                ExceptionCollector.appendException(ImportError(msg))
+                return
+
+        if toscaparser.utils.urlutils.UrlUtils.validate_url(full_url):
             return YAML_LOADER(full_url, False)
         else:
-            msg = (_('namespace_uri "%(n_uri)s" is not valid in import '
+            msg = (_('repository url "%(n_uri)s" is not valid in import '
                      'definition "%(tpl)s".')
-                   % {'n_uri': namespace_uri, 'tpl': import_name})
+                   % {'n_uri': repo_url, 'tpl': import_name})
             log.error(msg)
             ExceptionCollector.appendException(ImportError(msg))
diff --git a/toscaparser/tests/data/test_repositories_definition.yaml b/toscaparser/tests/data/test_repositories_definition.yaml
index 09271a2f..2145d8f1 100644
--- a/toscaparser/tests/data/test_repositories_definition.yaml
+++ b/toscaparser/tests/data/test_repositories_definition.yaml
@@ -4,6 +4,13 @@ repositories:
   some_repository:
     description: Some repo
     url: https://raw.githubusercontent.com/openstack/tosca-parser/master/toscaparser/tests/data/custom_types/
+    namespace_uri: http://docs.oasis-open.org/tosca/ns/simple/yaml/1.0a
+    namespace_prefix: oasis_tosca
+
+imports:
+  - some_import:
+      file: compute_with_prop.yaml
+      repository: some_repository
 
 description: >
   TOSCA test for testing repositories definition
@@ -11,4 +18,6 @@ description: >
   node_templates:
 
     server:
-      type: tosca.nodes.Compute
+      type: tosca.nodes.ComputeWithProp
+      properties:
+         test: yes
diff --git a/toscaparser/tests/test_toscatplvalidation.py b/toscaparser/tests/test_toscatplvalidation.py
index c83a809e..4d2cd3f4 100644
--- a/toscaparser/tests/test_toscatplvalidation.py
+++ b/toscaparser/tests/test_toscatplvalidation.py
@@ -167,9 +167,8 @@ tosca-parser/master/toscaparser/tests/data/custom_types/wordpress.yaml
         imports:
           - some_definitions: custom_types/paypalpizzastore_nodejs_app.yaml
           - more_definitions:
-              file: toscaparser/tests/data/custom_types/wordpress.yaml
-              repository: tosca-parser/master
-              namespace_uri: https://raw.githubusercontent.com/openstack
+              file: 'https://raw.githubusercontent.com/openstack/tosca-parser\
+/master/toscaparser/tests/data/custom_types/wordpress.yaml'
               namespace_prefix: single_instance_wordpress
         '''
         path = 'toscaparser/tests/data/tosca_elk.yaml'
@@ -258,10 +257,10 @@ tosca_single_instance_wordpress_with_url_import.yaml'
         tpl_snippet = '''
         imports:
           - more_definitions:
-              file: heat-translator/master/translator/tests/data/\
-custom_types/wordpress.yaml
-              namespace_uri: https://raw.githubusercontent.com/openstack/
-              namespace_prefix: mycompany
+             file: https://raw.githubusercontent.com/openstack/\
+heat-translator/master/translator/tests/data/custom_types/wordpress.yaml
+             namespace_prefix: mycompany
+             namespace_uri: http://docs.oasis-open.org/tosca/ns/simple/yaml/1.0
         '''
         path = 'toscaparser/tests/data/tosca_elk.yaml'
         custom_defs = self._imports_content_test(tpl_snippet,
@@ -270,21 +269,19 @@ custom_types/wordpress.yaml
         self.assertTrue(custom_defs.get("mycompany.tosca.nodes."
                                         "WebApplication.WordPress"))
 
-    def test_import_error_namespace_uri(self):
+    def test_import_error_file_uri(self):
         tpl_snippet = '''
         imports:
           - more_definitions:
-              file: toscaparser/tests/data/tosca_elk.yaml
-              namespace_uri: mycompany.com/ns/tosca/2.0
-              namespace_prefix: mycompany
+             file: mycompany.com/ns/tosca/2.0/toscaparser/tests/data\
+/tosca_elk.yaml
+             namespace_prefix: mycompany
+             namespace_uri: http://docs.oasis-open.org/tosca/ns/simple/yaml/1.0
         '''
-        errormsg = _('namespace_uri "mycompany.com/ns/tosca/2.0" is not '
-                     'valid in import definition "more_definitions".')
         path = 'toscaparser/tests/data/tosca_elk.yaml'
-        err = self.assertRaises(ImportError,
-                                self._imports_content_test,
-                                tpl_snippet, path, None)
-        self.assertEqual(errormsg, err.__str__())
+        self.assertRaises(ImportError,
+                          self._imports_content_test,
+                          tpl_snippet, path, None)
 
     def test_import_single_line_error(self):
         tpl_snippet = '''