diff --git a/java/org/slub/rosetta/dps/repository/plugin/ValidationResourceResolver.java b/java/org/slub/rosetta/dps/repository/plugin/ValidationResourceResolver.java
index f528129dad0a0f61957fa9ab4b72bf40c92a8f02..b0795d38b2d32c1877fb0983b25de1ea36296bcb 100644
--- a/java/org/slub/rosetta/dps/repository/plugin/ValidationResourceResolver.java
+++ b/java/org/slub/rosetta/dps/repository/plugin/ValidationResourceResolver.java
@@ -31,7 +31,6 @@ public class ValidationResourceResolver implements LSResourceResolver {
     private final Set<ValidationSchema> namespaceSchemaMap ;
     private final ValidationResultHandle resultHandle;
 
-
     public ValidationResourceResolver(Set<ValidationSchema> namespaceSchemaMap, ValidationResultHandle resultHandle) {
         this.namespaceSchemaMap = namespaceSchemaMap;
         this.resultHandle = resultHandle;
@@ -71,17 +70,21 @@ public class ValidationResourceResolver implements LSResourceResolver {
     }
 
     private Path createCombinedSchemaFile (String systemId, String baseURIString ) {
+        assert baseURIString != null;
+        assert systemId != null;
         Path basenameSystemID = Paths.get(systemId).getFileName();
-        Path dirnameSchema = null;
+        Path dirnameSchema;
         try {
-            dirnameSchema = Paths.get(new URI(baseURIString).getPath()).getParent().toAbsolutePath();
+            URI baseURI = new URI(baseURIString);
+            dirnameSchema = Paths.get( baseURI.getPath() ).getParent().toAbsolutePath();
         } catch (URISyntaxException e) {
             throw new RuntimeException(e); // should not occure
         }
-        //combine together
-        Path combinedSchema = dirnameSchema.resolve(basenameSystemID);
-        //System.out.println( "COMBINED: " + combinedSchema.toString());
-        return  combinedSchema;
+        /*
+        System.out.println("##### dirname: "+ dirnameSchema.toString());
+        System.out.println("##### basename: "+ basenameSystemID.toString());
+        */
+        return dirnameSchema.resolve(basenameSystemID);
     }
     @Override
     public LSInput resolveResource(String type, String nameSpace, String publicId, String systemId, String baseURIString) {
@@ -111,21 +114,19 @@ public class ValidationResourceResolver implements LSResourceResolver {
            b) MATHML3 uses includes of XSD to same namespaces
          */
         URI schemaURI = validationSchemaOptional.get().schemaURI;
+        /*
         System.out.println("### BASEURI: " + baseURIString + " -> " + checkUriStringIsLocal( baseURIString ));
         System.out.println("### SchemaURI: " + schemaURI + " -> " + checkUriIsLocal( schemaURI) );
-
+        */
         if (checkUriStringIsLocal(baseURIString)) {
             if (checkUriIsLocal(schemaURI)) {
-                Path basenameSystemID = Paths.get(systemId).getFileName();
-                Path dirnameSchema = null;
-                try {
-                    dirnameSchema = Paths.get(new URI(baseURIString).getPath()).getParent().toAbsolutePath();
-                } catch (URISyntaxException e) {
-                    throw new RuntimeException(e); // should not occure
-                }
-                //combine together
+                assert systemId != null;
+                assert baseURIString != null;
                 Path combinedSchema = createCombinedSchemaFile(systemId, baseURIString);
                 String combinedSchemaStr = combinedSchema.toString();
+                /*
+                System.out.println("### COMBINED: "+ combinedSchemaStr);
+                 */
                 File combinedSchemaFile = new File( combinedSchemaStr );
                 if (combinedSchemaFile.isFile()) {
                     resultHandle.info("RESOURCE_RESOLVER: ignoring catalog, using a combined mapping to " + schemaURI + " !");