diff --git a/apps/dnet-is-application/src/main/java/eu/dnetlib/is/util/ResourceValidator.java b/apps/dnet-is-application/src/main/java/eu/dnetlib/is/util/ResourceValidator.java
index 10d72b47..c72c443e 100644
--- a/apps/dnet-is-application/src/main/java/eu/dnetlib/is/util/ResourceValidator.java
+++ b/apps/dnet-is-application/src/main/java/eu/dnetlib/is/util/ResourceValidator.java
@@ -9,12 +9,13 @@ import javax.xml.XMLConstants;
 import javax.xml.transform.stream.StreamSource;
 import javax.xml.validation.Schema;
 import javax.xml.validation.SchemaFactory;
-import javax.xml.validation.Validator;
 
 import org.apache.commons.io.IOUtils;
 import org.apache.commons.lang3.StringUtils;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
+import org.dom4j.DocumentException;
+import org.dom4j.DocumentHelper;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.http.MediaType;
 import org.springframework.stereotype.Component;
@@ -46,16 +47,18 @@ public class ResourceValidator {
 
 	private void validateXml(final String type, final String content) throws InformationServiceException {
 		final Schema schema = getXmlSchema(type);
-		if (schema == null) {
-			log.warn("no registered schema for " + type);
-			return;
-		}
-		final Validator validator = schema.newValidator();
-
-		try {
-			validator.validate(new StreamSource(new StringReader(content)));
-		} catch (final Exception e) {
-			throw new InformationServiceException(e.getMessage(), e);
+		if (schema != null) {
+			try {
+				schema.newValidator().validate(new StreamSource(new StringReader(content)));
+			} catch (final Exception e) {
+				throw new InformationServiceException(e.getMessage(), e);
+			}
+		} else {
+			try {
+				DocumentHelper.parseText(content);
+			} catch (final DocumentException e) {
+				throw new InformationServiceException(e.getMessage(), e);
+			}
 		}
 	}