1 files changed, 25 insertions, 16 deletions
diff --git a/common/src/at/gv/egovernment/moa/util/DOMUtils.java b/common/src/at/gv/egovernment/moa/util/DOMUtils.java
index fddf16944..95ee3aa4d 100644
--- a/common/src/at/gv/egovernment/moa/util/DOMUtils.java
+++ b/common/src/at/gv/egovernment/moa/util/DOMUtils.java
@@ -94,9 +94,13 @@ public class DOMUtils {
   private static SymbolTable symbolTable = new SymbolTable(BIG_PRIME);
   /** Xerces schema grammar pool. */
   private static XMLGrammarPool grammarPool = new XMLGrammarPoolImpl();
-  
+  /** Map, that holds the NamespaceURIs of the grammarPool, to prevent multiple
+    * entries of one NamespaceURI */
+  private static Set grammarNamespaces; 
+
   static {
     grammarPool.lockPool();
+    grammarNamespaces = new HashSet();
   }
 
   /**
@@ -111,23 +115,28 @@ public class DOMUtils {
     throws IOException {
     XMLGrammarPreparser preparser;
 
-    // unlock the pool so that we can add another grammar
-    grammarPool.unlockPool();
-
-    // prepare the preparser
-    preparser = new XMLGrammarPreparser(symbolTable);
-    preparser.registerPreparser(XMLGrammarDescription.XML_SCHEMA, null);
-    preparser.setProperty(GRAMMAR_POOL, grammarPool);
-    preparser.setFeature(NAMESPACES_FEATURE, true);
-    preparser.setFeature(VALIDATION_FEATURE, true);
+    if (!grammarNamespaces.contains(systemId)) { 
 
-    // add the grammar to the pool
-    preparser.preparseGrammar(
+      grammarNamespaces.add(systemId);
+    
+      // unlock the pool so that we can add another grammar
+      grammarPool.unlockPool();
+	
+      // prepare the preparser
+      preparser = new XMLGrammarPreparser(symbolTable);
+      preparser.registerPreparser(XMLGrammarDescription.XML_SCHEMA, null);
+      preparser.setProperty(GRAMMAR_POOL, grammarPool);
+      preparser.setFeature(NAMESPACES_FEATURE, true);
+      preparser.setFeature(VALIDATION_FEATURE, true);
+	
+      // add the grammar to the pool
+      preparser.preparseGrammar(
       XMLGrammarDescription.XML_SCHEMA,
-      new XMLInputSource(null, systemId, null, inputStream, null));
-
-    // lock the pool again so that schemas are not added automatically
-    grammarPool.lockPool();
+        new XMLInputSource(null, systemId, null, inputStream, null));
+	
+      // lock the pool again so that schemas are not added automatically
+      grammarPool.lockPool();
+    }
   }
 
   /**