--- loncom/homework/structuretags.pm	2007/10/12 18:45:47	1.403
+++ loncom/homework/structuretags.pm	2007/10/16 23:20:25	1.404
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA 
 # definition of tags that give a structure to a document
 #
-# $Id: structuretags.pm,v 1.403 2007/10/12 18:45:47 albertel Exp $
+# $Id: structuretags.pm,v 1.404 2007/10/16 23:20:25 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -1747,6 +1747,13 @@ sub start_startouttext {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
     my @result=(''.'');
     if ($target eq 'edit' || $target eq 'modified' ) { @result=('','no'); }
+    
+    my $nesting = 
+	&Apache::lonxml::set_state('outtext',
+				   &Apache::lonxml::get_state('outtext')+1);
+    if ($nesting > 1 && $env{'request.state'} eq 'construct') {
+	&Apache::lonxml::error("Nesting of <startouttext /> not allowed, on line ".$token->[5]);
+    }
     return (@result);
 }
 
@@ -1786,6 +1793,14 @@ sub start_endouttext {
 	$result='<endouttext />'.
 	    &Apache::edit::handle_insertafter('startouttext');
     }
+
+    my $nesting = 
+	&Apache::lonxml::set_state('outtext',
+				   &Apache::lonxml::get_state('outtext')-1);
+    if ($nesting < 0 && $env{'request.state'} eq 'construct') {
+	&Apache::lonxml::error(" Extraneous &lt;endouttext /&gt; not allowed on line ".$token->[5]);
+	&Apache::lonxml::set_state('outtext', 0);
+    }
     return $result;
 }