--- loncom/xml/lonxml.pm	2001/11/29 21:38:17	1.140
+++ loncom/xml/lonxml.pm	2001/12/14 22:59:34	1.141
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # XML Parser Module 
 #
-# $Id: lonxml.pm,v 1.140 2001/11/29 21:38:17 albertel Exp $
+# $Id: lonxml.pm,v 1.141 2001/12/14 22:59:34 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -66,15 +66,24 @@ use Math::Random qw(:all);
 use Opcode;
 
 sub register {
-  my $space;
-  my @taglist;
-  my $temptag;
-  ($space,@taglist) = @_;
-  foreach $temptag (@taglist) {
-    $Apache::lonxml::alltags{$temptag}=$space;
+  my ($space,@taglist) = @_;
+  foreach my $temptag (@taglist) {
+    push(@{ $Apache::lonxml::alltags{$temptag} },$space);
   }
 }
 
+sub deregister {
+  my ($space,@taglist) = @_;
+  &printalltags();
+  foreach my $temptag (@taglist) {
+    my $tempspace = $Apache::lonxml::alltags{$temptag}[-1];
+    if ($tempspace eq $space) {
+      pop(@{ $Apache::lonxml::alltags{$temptag} });
+    }
+  }
+  &printalltags();
+}
+
 use Apache::Constants qw(:common);
 use Apache::lontexconvert;
 use Apache::style;
@@ -425,7 +434,8 @@ sub unloadevents() {
 sub printalltags {
   my $temp;
   foreach $temp (sort keys %Apache::lonxml::alltags) {
-    &Apache::lonxml::debug("$temp -- $Apache::lonxml::alltags{$temp}");
+    &Apache::lonxml::debug("$temp -- ".
+		  join(',',@{ $Apache::lonxml::alltags{$temp} }));
   }
 }
 
@@ -644,11 +654,11 @@ sub callsub {
     my $sub1;
     no strict 'refs';
     my $tag=$token->[1];
-    my $space=$Apache::lonxml::alltags{$tag};
+    my $space=$Apache::lonxml::alltags{$tag}[-1];
     if (!$space) {
-	$tag=~tr/A-Z/a-z/;
+     	$tag=~tr/A-Z/a-z/;
 	$sub=~tr/A-Z/a-z/;
-	$space=$Apache::lonxml::alltags{$tag}
+	$space=$Apache::lonxml::alltags{$tag}[-1]
     }
 
     my $deleted=0;
@@ -1044,9 +1054,9 @@ sub handler {
   } else {
     $request->content_type('text/html');
   }
-  &Apache::loncommon::no_cache($request); 
+  &Apache::loncommon::no_cache($request);
   $request->send_http_header;
-  
+
   return OK if $request->header_only;