diff --git a/src/dependency_injector/schema.py b/src/dependency_injector/schema.py
index b1971f08..8608a816 100644
--- a/src/dependency_injector/schema.py
+++ b/src/dependency_injector/schema.py
@@ -150,18 +150,21 @@ class SchemaProcessorV1:
             return None
 
         for segment in segments[1:]:
-            if segment == 'as_int()':
-                provider = provider.as_int()
-            elif segment == 'as_float()':
-                provider = provider.as_float()
-            elif segment.startswith('is_'):  # TODO
-                provider = provider.as_(str)
-                ...
-            else:
-                try:
-                    provider = getattr(provider, segment)
-                except AttributeError:
-                    return None
+            parentheses = ''
+            if '(' in segment and ')' in segment:
+                parentheses = segment[segment.find('('):segment.rfind(')')+1]
+                segment = segment.replace(parentheses, '')
+
+            try:
+                provider = getattr(provider, segment)
+            except AttributeError:
+                # TODO
+                return None
+
+            if parentheses:
+                # TODO
+                provider = provider()
+
         return provider
 
 
diff --git a/tests/unit/samples/schemasample/container-boto3-session.yml b/tests/unit/samples/schemasample/container-boto3-session.yml
new file mode 100644
index 00000000..7f530a4e
--- /dev/null
+++ b/tests/unit/samples/schemasample/container-boto3-session.yml
@@ -0,0 +1,26 @@
+version: "1"
+
+container:
+
+  config:
+    provider: Configuration
+
+  session:
+    provider: Singleton
+    provides: boto3.session.Session
+    kwargs:
+      aws_access_key_id: container.config.aws_access_key_id
+      aws_secret_access_key: container.config.aws_secret_access_key
+      aws_session_token: container.config.aws_session_token
+
+  s3_client:
+    provider: Factory
+    provides: container.session.provided.client.call()
+    kwargs:
+      service_name: s3
+
+  sqs_client:
+    provider: Factory
+    provides: container.session.provided.client.call()
+    kwargs:
+      service_name: sqs
diff --git a/tests/unit/schema/test_integration_py36.py b/tests/unit/schema/test_integration_py36.py
index 3360e742..38a48a04 100644
--- a/tests/unit/schema/test_integration_py36.py
+++ b/tests/unit/schema/test_integration_py36.py
@@ -273,3 +273,13 @@ class TestSchemaMultipleContainersWithInlineProviders(unittest.TestCase):
         self.assertIs(photo_service1.s3, photo_service2.s3)
         self.assertIs(photo_service1.s3, container.gateways.s3_client())
         self.assertIs(photo_service2.s3, container.gateways.s3_client())
+
+
+class TestSchemaBoto3Session(unittest.TestCase):
+
+    def test(self):
+        container = containers.DynamicContainer()
+        container.from_yaml_schema(f'{_SAMPLES_DIR}/schemasample/container-boto3-session.yml')
+
+        self.assertEqual(container.s3_client().__class__.__name__, 'S3')
+        self.assertEqual(container.sqs_client().__class__.__name__, 'SQS')