diff --git a/SysML2.NET.Serializer.TextualNotation.Tests/Expected/17-Sequence Modeling/17a-Sequence-Modeling.sysml b/SysML2.NET.Serializer.TextualNotation.Tests/Expected/17-Sequence Modeling/17a-Sequence-Modeling.sysml
new file mode 100644
index 00000000..e334824b
--- /dev/null
+++ b/SysML2.NET.Serializer.TextualNotation.Tests/Expected/17-Sequence Modeling/17a-Sequence-Modeling.sysml	
@@ -0,0 +1,34 @@
+package '17a-Sequence-Modeling' {
+    private import ScalarValues::*;
+    private import PayloadDefinitions::*;
+    package PayloadDefinitions {
+        item def Subscribe {
+            attribute topic: String;
+            ref part subscriber;
+        }
+        item def Publish {
+            attribute topic: String;
+            ref publication;
+        }
+        item def Deliver {
+            ref publication;
+        }
+    }
+    occurrence def PubSubSequence {
+        part producer[1] {
+            event occurrence publish_source_event;
+        }
+        abstract message publish_message of Publish[1] from producer.publish_source_event to server.publish_target_event;
+        part server[1] {
+            event occurrence subscribe_target_event;
+            then event occurrence publish_target_event;
+            then event occurrence deliver_source_event;
+        }
+        abstract message subscribe_message of Subscribe[1] from consumer.subscribe_source_event to server.subscribe_target_event;
+        abstract message deliver_message of Deliver[1] from server.deliver_source_event to consumer.deliver_target_event;
+        part consumer[1] {
+            event occurrence subscribe_source_event;
+            then event occurrence deliver_target_event;
+        }
+    }
+}
diff --git a/SysML2.NET.Serializer.TextualNotation.Tests/Expected/17-Sequence Modeling/17b-Sequence-Modeling.sysml b/SysML2.NET.Serializer.TextualNotation.Tests/Expected/17-Sequence Modeling/17b-Sequence-Modeling.sysml
new file mode 100644
index 00000000..f1b419dd
--- /dev/null
+++ b/SysML2.NET.Serializer.TextualNotation.Tests/Expected/17-Sequence Modeling/17b-Sequence-Modeling.sysml	
@@ -0,0 +1,34 @@
+package '17b-Sequence-Modeling' {
+    private import ScalarValues::*;
+    private import PayloadDefinitions::*;
+    package PayloadDefinitions {
+        item def Subscribe {
+            attribute topic: String;
+            ref part subscriber;
+        }
+        item def Publish {
+            attribute topic: String;
+            ref publication;
+        }
+        item def Deliver {
+            ref publication;
+        }
+    }
+    occurrence def PubSubSequence {
+        part producer[1] {
+            event publish_message.sourceEvent;
+        }
+        abstract message publish_message of Publish[1];
+        part server[1] {
+            event subscribe_message.targetEvent;
+            then event publish_message.targetEvent;
+            then event deliver_message.sourceEvent;
+        }
+        abstract message subscribe_message of Subscribe[1];
+        abstract message deliver_message of Deliver[1];
+        part consumer[1] {
+            event subscribe_message.sourceEvent;
+            then event deliver_message.targetEvent;
+        }
+    }
+}
diff --git a/SysML2.NET.Serializer.TextualNotation.Tests/Writers/TextualNotationValidationTestFixture.cs b/SysML2.NET.Serializer.TextualNotation.Tests/Writers/TextualNotationValidationTestFixture.cs
index 8153511d..5ec197dd 100644
--- a/SysML2.NET.Serializer.TextualNotation.Tests/Writers/TextualNotationValidationTestFixture.cs
+++ b/SysML2.NET.Serializer.TextualNotation.Tests/Writers/TextualNotationValidationTestFixture.cs
@@ -134,6 +134,8 @@ public void OneTimeTearDown()
         [TestCase("15-Properties-Values-Expressions", "15_13-Discretely Sampled Function Value.sysmlx")]
         [TestCase("15-Properties-Values-Expressions", "15_19-Materials with Properties.sysmlx")]
         [TestCase("15-Properties-Values-Expressions", "15_19a-Materials with Properties.sysmlx")]
+        [TestCase("17-Sequence Modeling", "17a-Sequence-Modeling.sysmlx")]
+        [TestCase("17-Sequence Modeling", "17b-Sequence-Modeling.sysmlx")]
         public async Task VerifyValidationTextualNotationXmi(string folderName, string fileName)
         {
             var loggerFactory = LoggerFactory.Create(builder =>