diff --git a/source/w3cipa/sources/w3c/voiceinteraction/ipa/TextMultiModalInput.cpp b/source/w3cipa/sources/w3c/voiceinteraction/ipa/TextMultiModalInput.cpp
index f49e0d8..5822828 100644
--- a/source/w3cipa/sources/w3c/voiceinteraction/ipa/TextMultiModalInput.cpp
+++ b/source/w3cipa/sources/w3c/voiceinteraction/ipa/TextMultiModalInput.cpp
@@ -1,13 +1,15 @@
-#include "TextMultiModalInput.h"
+#include "TextModalityType.h"
+#include "TextMultiModalInput.h"
 
 namespace w3c {
 namespace voiceinteraction {
 namespace ipa {
 
-const std::string TextMultiModalInput::MODALITY = std::string("text");
+const ModalityType TextMultiModalInput::MODALITY = TextModalityType();
 
-TextMultiModalInput::TextMultiModalInput(const std::string& output)
-    : text(output) {
+TextMultiModalInput::TextMultiModalInput(const std::string& input)
+    : MultiModalInput(MODALITY),
+      text(input) {
 }
 
 } // namespace ipa
diff --git a/source/w3cipa/sources/w3c/voiceinteraction/ipa/TextMultiModalInput.h b/source/w3cipa/sources/w3c/voiceinteraction/ipa/TextMultiModalInput.h
index 95b59a5..5fb6a05 100644
--- a/source/w3cipa/sources/w3c/voiceinteraction/ipa/TextMultiModalInput.h
+++ b/source/w3cipa/sources/w3c/voiceinteraction/ipa/TextMultiModalInput.h
@@ -1,4 +1,4 @@
-#ifndef TEXTMULTIMODALINPUT_H
+#ifndef TEXTMULTIMODALINPUT_H
 #define TEXTMULTIMODALINPUT_H
 
 #include <string>
@@ -13,15 +13,11 @@ class TextMultiModalInput : public MultiModalInput {
 public:
     TextMultiModalInput(const std::string& input);
 
-    virtual const std::string getModality() const {
-        return MODALITY;
-    };
-
     const std::string& getTextInput() const {
         return text;
     }
 
-    const static std::string MODALITY;
+    const static ModalityType MODALITY;
 private:
     std::string text;
 };
diff --git a/source/w3cipa/sources/w3c/voiceinteraction/ipa/TextMultiModalOutput.cpp b/source/w3cipa/sources/w3c/voiceinteraction/ipa/TextMultiModalOutput.cpp
index 0530538..a00614d 100644
--- a/source/w3cipa/sources/w3c/voiceinteraction/ipa/TextMultiModalOutput.cpp
+++ b/source/w3cipa/sources/w3c/voiceinteraction/ipa/TextMultiModalOutput.cpp
@@ -1,13 +1,15 @@
-#include "TextMultiModalOutput.h"
+#include "TextModalityType.h"
+#include "TextMultiModalOutput.h"
 
 namespace w3c {
 namespace voiceinteraction {
 namespace ipa {
 
-const std::string TextMultiModalOutput::MODALITY = std::string("text");
+const ModalityType TextMultiModalOutput::MODALITY = TextModalityType();
 
 TextMultiModalOutput::TextMultiModalOutput(const std::string& output)
-    : text(output) {
+    : MultiModalOutput(MODALITY),
+      text(output) {
 }
 
 } // namespace ipa
diff --git a/source/w3cipa/sources/w3c/voiceinteraction/ipa/TextMultiModalOutput.h b/source/w3cipa/sources/w3c/voiceinteraction/ipa/TextMultiModalOutput.h
index da410a0..ea00d78 100644
--- a/source/w3cipa/sources/w3c/voiceinteraction/ipa/TextMultiModalOutput.h
+++ b/source/w3cipa/sources/w3c/voiceinteraction/ipa/TextMultiModalOutput.h
@@ -1,4 +1,4 @@
-#ifndef TEXTMULTMODALOUTPUT_H
+#ifndef TEXTMULTMODALOUTPUT_H
 #define TEXTMULTMODALOUTPUT_H
 
 #include <string>
@@ -13,15 +13,11 @@ class TextMultiModalOutput : public MultiModalOutput {
 public:
     TextMultiModalOutput(const std::string& output);
 
-    virtual const std::string getModality() const {
-        return MODALITY;
-    };
-
     const std::string& getTextOutput() const {
         return text;
     }
 
-    const static std::string MODALITY;
+    const static ModalityType MODALITY;
 private:
     std::string text;
 };