Index: main/java/org/exolab/castor/xml/UnmarshalHandler.java
===================================================================
--- main/java/org/exolab/castor/xml/UnmarshalHandler.java	(Revision 6978)
+++ main/java/org/exolab/castor/xml/UnmarshalHandler.java	(Arbeitskopie)
@@ -897,7 +897,9 @@
                     context.setResolver(_cdResolver);
                     context.setConfiguration(_config);
                     validator.validate(state.object, context);
-                    validator.checkUnresolvedIdrefs(context);
+                    if (!_config.getLenientIdValidation()) {
+                        validator.checkUnresolvedIdrefs(context);
+                    }
                     context.cleanup();
                 }
                 catch(ValidationException vEx) {
@@ -2940,7 +2942,7 @@
         if (classDesc.getIdentity() == descriptor) {
             
             try {
-                _idResolver.bind(attValue, parent, isValidating());
+                _idResolver.bind(attValue, parent, isValidating() && !_config.getLenientIdValidation());
             } catch (ValidationException e) {
                 throw new SAXException("Duplicate ID " + attValue + " encountered.", e);
             }
Index: main/java/org/exolab/castor/util/Configuration.java
===================================================================
--- main/java/org/exolab/castor/util/Configuration.java	(Revision 6978)
+++ main/java/org/exolab/castor/util/Configuration.java	(Arbeitskopie)
@@ -289,6 +289,15 @@
          */
         public static final String LenientSequenceOrder = "org.exolab.castor.xml.lenient.sequence.order";
 
+        /**
+         * Property specifying whether id/href validation should be lenient;
+         * defaults to false
+         * <pre>
+         * org.exolab.castor.xml.lenient.id.validation=false
+         * </pre>
+         */
+        public static final String LenientIdValidation = "org.exolab.castor.xml.lenient.id.validation";
+
     } //-- class: Property
 
 
@@ -540,7 +549,7 @@
     public static boolean getDefaultLenientSequenceOrder()
     {
         return Boolean.valueOf(_defaultProps.getProperty(Property.LenientSequenceOrder, "false")).booleanValue();
-    } //-- getDefaultParser
+    }
 
     /**
      * Indicates whether sequence order validation is lenient.
@@ -554,8 +563,32 @@
     public boolean getLenientSequenceOrder() {
         return getDefaultLenientSequenceOrder();
     } //-- getParser
-    
+
     /**
+     * Indicates whether (by default) id/href validation is lenient.
+     *
+     * @return True if id/href validation is lenient.
+     * @see #getLenientIdValidation()
+     */
+    public static boolean getDefaultLenientIdValidation()
+    {
+        return Boolean.valueOf(_defaultProps.getProperty(Property.LenientIdValidation, "false")).booleanValue();
+    }
+
+    /**
+     * Indicates whether id/href validation is lenient.
+     *
+     * Design note: This method should be overloaded by any 
+     * sub-classes.
+     * 
+     * @return True if id/href validation is lenient.
+     * @see #getDefaultLenientIdValidation()
+     */
+    public boolean getLenientIdValidation() {
+        return getDefaultLenientIdValidation();
+    }
+
+    /**
      * Return an XML document parser implementing the feature list
      * specified in the default configuration file.
      *
Index: main/java/org/exolab/castor/util/LocalConfiguration.java
===================================================================
--- main/java/org/exolab/castor/util/LocalConfiguration.java	(Revision 6978)
+++ main/java/org/exolab/castor/util/LocalConfiguration.java	(Arbeitskopie)
@@ -590,8 +590,17 @@
     public boolean getLenientSequenceOrder()
     {
         return Boolean.valueOf(getProperties().getProperty(Property.LenientSequenceOrder, "false")).booleanValue();
-    } //-- getDefaultParser
+    }
 
+    /**
+     * Indicates whether id/href validation should be lenient.
+     *
+     * @return True if id/href validation should be lenient.
+     */
+    public boolean getLenientIdValidation()
+    {
+        return Boolean.valueOf(getProperties().getProperty(Property.LenientIdValidation, "false")).booleanValue();
+    }
 
     /**
      * Calls {@link #getDefault()} to load the configuration the
Index: main/resources/org/exolab/castor/castor.properties
===================================================================
--- main/resources/org/exolab/castor/castor.properties	(Revision 6978)
+++ main/resources/org/exolab/castor/castor.properties	(Arbeitskopie)
@@ -240,3 +240,8 @@
 # defaults to false
 org.exolab.castor.xml.lenient.sequence.order=false
         
+#
+# Property specifying whether id/href validation should be lenient;
+# defaults to false
+org.exolab.castor.xml.lenient.id.validation=false
+        
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