--- a/Lib/IMPL/DOM/Navigator/Builder.pm	Mon Nov 16 18:39:25 2009 +0300
+++ b/Lib/IMPL/DOM/Navigator/Builder.pm	Tue Nov 17 17:46:24 2009 +0300
@@ -19,7 +19,7 @@
     my ($this,$docClass,$schema) = @_;
     
     $this->{$_docClass} = $docClass;
-    $this->{$_schemaNavi} = IMPL::DOM::Navigator::SchemaNavigator->new($schema);
+    $this->{$_schemaNavi} = $schema ? IMPL::DOM::Navigator::SchemaNavigator->new($schema) : undef;
 }
 
 sub NavigateCreate {
@@ -32,7 +32,7 @@
         if (! $this->{$Document}) {
             $node = $this->{$Document} = $this->{$_docClass}->new(nodeName => $nodeName,%props);
         } else {
-            die new IMPL::InvalidOperationException('Can\t create a second top level element');
+            die new IMPL::InvalidOperationException('Can\t create a second top level element') unless $this->{$_nodeCurrent};
             $node = $this->{$Document}->Create($nodeName,$class,\%props);
             push @{$this->{$_nodesPath}}, $this->{$_nodeCurrent};
             $this->{$_nodeCurrent}->appendChild($node);