Added custom error level to Result object.

src/test/resources/examples/simple/input/foo-custom-level-error.xml

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<!--
+  ~ Copyright 2017-2022  Koordinierungsstelle für IT-Standards (KoSIT)
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~     http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+
+<foo xmlns="http://validator.kosit.de/test-sample">
+    <inner>asldkfj</inner>
+    <inner>asldkfj</inner>
+    <content>
+    </content>
+</foo>