diff --git a/examples/KositValidator.php b/examples/KositValidator.php
index 206931df..bfda916f 100644
--- a/examples/KositValidator.php
+++ b/examples/KositValidator.php
@@ -14,15 +14,19 @@
  */
 function showValidationResult(ZugferdKositValidator $kositValidator)
 {
+    foreach ($kositValidator->getProcessOutput() as $output) {
+        echo $output . PHP_EOL;
+    }
+
     if ($kositValidator->hasProcessErrors()) {
         echo "\033[01;31mProcess failed\e[0m\n";
         foreach ($kositValidator->getProcessErrors() as $processError) {
-            echo " - " . $processError["message"] . PHP_EOL;
+            echo " - " . $processError . PHP_EOL;
         }
     } elseif ($kositValidator->hasValidationErrors()) {
         echo "\033[01;31mValidation failed\e[0m\n";
         foreach ($kositValidator->getValidationErrors() as $validationError) {
-            echo " - " . $validationError["message"] . PHP_EOL;
+            echo " - " . $validationError . PHP_EOL;
         }
     } else {
         echo "\033[01;32mValidation passed\e[0m\n";
diff --git a/src/ZugferdKositValidator.php b/src/ZugferdKositValidator.php
index eda8ec38..a27e4f79 100644
--- a/src/ZugferdKositValidator.php
+++ b/src/ZugferdKositValidator.php
@@ -128,6 +128,11 @@ class ZugferdKositValidator
      */
     public const MSG_TYPE_VALIDATIONINFORMATION = 'validationinformation';
 
+    /**
+     * Message Type "Process Output"
+     */
+    public const MSG_TYPE_PROCESSOUTPUT = 'processoutput';
+
     /**
      * Constructor
      *
@@ -416,20 +421,36 @@ private function addToMessageBag($error, string $messageType = ""): void
     }
 
     /**
-     * Returns an array of all validation errors
+     * Get messages from messagebag filtered by message type
      *
+     * @param string $messageType
      * @return array
      */
-    public function getValidationErrors(): array
+    private function getMessageBagFiltered(string $messageType): array
     {
-        return array_filter(
-            $this->messageBag,
+        return array_map(
             function ($data) {
-                return $data['type'] == static::MSG_TYPE_VALIDATIONERROR;
-            }
+                return $data["message"];
+            },
+            array_filter(
+                $this->messageBag,
+                function ($data) use ($messageType) {
+                    return $data['type'] == $messageType;
+                }
+            )
         );
     }
 
+    /**
+     * Returns an array of all validation errors
+     *
+     * @return array
+     */
+    public function getValidationErrors(): array
+    {
+        return $this->getMessageBagFiltered(static::MSG_TYPE_VALIDATIONERROR);
+    }
+
     /**
      * Returns true if __no__ validation errors are present otherwise false
      *
@@ -457,12 +478,7 @@ public function hasValidationErrors(): bool
      */
     public function getValidationWarnings(): array
     {
-        return array_filter(
-            $this->messageBag,
-            function ($data) {
-                return $data['type'] == static::MSG_TYPE_VALIDATIONWARNING;
-            }
-        );
+        return $this->getMessageBagFiltered(static::MSG_TYPE_VALIDATIONWARNING);
     }
 
     /**
@@ -492,12 +508,7 @@ public function hasValidationWarnings(): bool
      */
     public function getValidationInformation(): array
     {
-        return array_filter(
-            $this->messageBag,
-            function ($data) {
-                return $data['type'] == static::MSG_TYPE_VALIDATIONINFORMATION;
-            }
-        );
+        return $this->getMessageBagFiltered(static::MSG_TYPE_VALIDATIONINFORMATION);
     }
 
     /**
@@ -527,12 +538,7 @@ public function hasValidationInformation(): bool
      */
     public function getProcessErrors(): array
     {
-        return array_filter(
-            $this->messageBag,
-            function ($data) {
-                return $data['type'] == static::MSG_TYPE_INTERNALERROR;
-            }
-        );
+        return $this->getMessageBagFiltered(static::MSG_TYPE_INTERNALERROR);
     }
 
     /**
@@ -555,6 +561,16 @@ public function hasProcessErrors(): bool
         return !$this->hasNoProcessErrors();
     }
 
+    /**
+     * Returns an array of all messages from process system (calling external applications)
+     *
+     * @return array
+     */
+    public function getProcessOutput(): array
+    {
+        return $this->getMessageBagFiltered(static::MSG_TYPE_PROCESSOUTPUT);
+    }
+
     /**
      * Check Requirements
      *
@@ -802,9 +818,11 @@ private function runValidationApplication(array $command, string $workingdirecto
             $process->setWorkingDirectory($workingdirectory);
             $process->run();
 
+            foreach (preg_split("/\r\n|\n|\r/", $process->getOutput()) as $outputLine) {
+                $this->addToMessageBag($outputLine, static::MSG_TYPE_PROCESSOUTPUT);
+            }
+
             if (!$process->isSuccessful()) {
-                echo "Dir " . $this->resolveBaseDirectory();
-                echo "Exitcode " . $process->getExitCode();
                 if ($process->getExitCode() == -1) {
                     $this->addToMessageBag("Parsing error. The commandline arguments specified are incorrect", static::MSG_TYPE_VALIDATIONERROR);
                 }