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diff --git a/eaaf_core/src/main/java/at/gv/egiz/eaaf/core/impl/utils/EaafDomEntityResolver.java b/eaaf_core/src/main/java/at/gv/egiz/eaaf/core/impl/utils/EaafDomEntityResolver.java
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+++ b/eaaf_core/src/main/java/at/gv/egiz/eaaf/core/impl/utils/EaafDomEntityResolver.java
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+/*
+ * Copyright 2017 Graz University of Technology EAAF-Core Components has been developed in a
+ * cooperation between EGIZ, A-SIT Plus, A-SIT, and Graz University of Technology.
+ *
+ * Licensed under the EUPL, Version 1.2 or - as soon they will be approved by the European
+ * Commission - subsequent versions of the EUPL (the "Licence"); You may not use this work except in
+ * compliance with the Licence. You may obtain a copy of the Licence at:
+ * https://joinup.ec.europa.eu/news/understanding-eupl-v12
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under the Licence
+ * is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the Licence for the specific language governing permissions and limitations under
+ * the Licence.
+ *
+ * This product combines work with different licenses. See the "NOTICE" text file for details on the
+ * various modules and licenses. The "NOTICE" text file is part of the distribution. Any derivative
+ * works that you distribute must include a readable copy of the "NOTICE" text file.
+*/
+
+
+
+package at.gv.egiz.eaaf.core.impl.utils;
+
+import java.io.InputStream;
+import at.gv.egiz.eaaf.core.api.data.XMLNamespaceConstants;
+import org.apache.xerces.util.URI;
+import org.apache.xerces.util.URI.MalformedURIException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.xml.sax.EntityResolver;
+import org.xml.sax.InputSource;
+
+/**
+ * An <code>EntityResolver</code> that looks up entities stored as local resources.
+ *
+ * <p>
+ * The following DTDs are mapped to local resources:
+ * <ul>
+ * <li>The XMLSchema.dtd</li>
+ * <li>The datatypes.dtd</li>
+ * </ul>
+ * </p>
+ * </p>
+ * For all other resources, an attempt is made to resolve them as resources, either absolute or
+ * relative to <code>Constants.SCHEMA_ROOT</code>.
+ *
+ */
+public class EaafDomEntityResolver implements EntityResolver {
+  private static final Logger log = LoggerFactory.getLogger(EaafDomEntityResolver.class);
+
+  /**
+   * Resolve an entity.
+   *<p>
+   * The <code>systemId</code> parameter is used to perform the lookup of the entity as a resource,
+   * either by interpreting the <code>systemId</code> as an absolute resource path, or by appending
+   * the last path component of <code>systemId</code> to <code>Constants.SCHEMA_ROOT</code>.
+   *</p>
+   *
+   * @param publicId The public ID of the resource.
+   * @param systemId The system ID of the resource.
+   * @return An <code>InputSource</code> from which the entity can be read, or <code>null</code>, if
+   *         the entity could not be found.
+   * @see org.xml.sax.EntityResolver#resolveEntity(java.lang.String, java.lang.String)
+   */
+  @Override
+  public InputSource resolveEntity(final String publicId, String systemId) {
+    InputStream stream;
+    int slashPos;
+
+    if (publicId != null) {
+      // check if we can resolve some standard dtd's
+      if (publicId.equalsIgnoreCase("-//W3C//DTD XMLSchema 200102//EN")) {
+        return new InputSource(
+            getClass().getResourceAsStream(XMLNamespaceConstants.SCHEMA_ROOT + "XMLSchema.dtd"));
+      } else if (publicId.equalsIgnoreCase("datatypes")) {
+        return new InputSource(
+            getClass().getResourceAsStream(XMLNamespaceConstants.SCHEMA_ROOT + "datatypes.dtd"));
+      }
+    } else if (systemId != null) {
+      // get the URI path
+      try {
+        final URI uri = new URI(systemId);
+        systemId = uri.getPath();
+
+        if (!"file".equals(uri.getScheme()) || "".equals(systemId.trim())) {
+          return null;
+        }
+
+      } catch (final MalformedURIException e) {
+        return null;
+      }
+
+      // try to get the resource from the full path
+      stream = getClass().getResourceAsStream(systemId);
+      if (stream != null) {
+        final InputSource source = new InputSource(stream);
+
+        source.setSystemId(systemId);
+        return source;
+      }
+
+      // try to get the resource from the last path component
+      slashPos = systemId.lastIndexOf('/');
+      if (slashPos >= 0 && systemId.length() > slashPos) {
+        systemId = systemId.substring(slashPos + 1, systemId.length());
+        stream = getClass().getResourceAsStream(XMLNamespaceConstants.SCHEMA_ROOT + systemId);
+        if (stream != null) {
+          final InputSource source = new InputSource(stream);
+
+          source.setSystemId(systemId);
+          return source;
+        }
+      }
+    }
+
+    return null; // nothing found - let the parser handle the entity
+  }
+}