--- loncom/interface/entities.pm	2008/05/05 10:46:19	1.11
+++ loncom/interface/entities.pm	2008/12/11 14:03:14	1.12.2.1
@@ -1,7 +1,7 @@
 # The LearningOnline Network
 # entity -> tex.
 #
-# 
+# $Id: entities.pm,v 1.12.2.1 2008/12/11 14:03:14 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -979,6 +979,7 @@ sub entity_to_latex {
     # Try to look up the entity (text or numeric) in the hash:
 
 
+
     my $latex = $entities{"$entity"};
     if (defined $latex) {
 	return $latex;
@@ -1031,6 +1032,18 @@ sub replace_entities {
 	$latex = &entity_to_latex($entity);
 	substr($input, $start, $end-$start) = $latex;
     }
+
+    # Hexadecimal entities:
+
+    while ($input =~ /&\#x(\d|[a-f,A-f])+;/) {
+	($start) = @-;
+	($end)   = @+;
+	$entity  = "0" . substr($input, $start+2, $end-$start-3); # 0xhexnumber
+	$latex = &entity_to_latex(hex($entity));
+	substr($input, $start, $end-$start) = $latex;
+    }
+
+
     # Now the &text; entites;
     
     while ($input =~/(&\w+;)/) {