--- loncom/interface/entities.pm	2008/04/28 10:33:35	1.9
+++ loncom/interface/entities.pm	2008/04/29 10:15:58	1.10
@@ -711,6 +711,10 @@ my %entities = (
     8733     => '\ensuremath{\propto}',
     'infin'  => '\ensuremath{\infty}',
     8734     => '\ensuremath{\infty}',
+#
+#   The items below require the isoent latex package which I can't find at least for FC5.
+#   Temporarily commented out.
+#
 #    'ang90'  => '\ensuremath{\sqangle}',
 #    8735     => '\ensuremath{\sqangle}',
     'ang'    => '\ensuremath{\angle}',
@@ -921,6 +925,16 @@ my %entities = (
     
 );
 
+#  There are some named entities that don't have a good
+#  latex equivalent, these are converted to utf-8 via this table
+#  of entity name -> unicode number.
+
+my  %utf_table = (
+    'THORN'  => 222,
+    'thorn'  => 254,
+    'eth'    => 240
+);
+
 # 
 #  Convert a numerical entity (that does not exist in our hash)
 #  to its UTF-8 equivalent representation.
@@ -935,8 +949,8 @@ my %entities = (
 #
 sub entity_to_utf8 {
     my ($unicode) = @_;
-
-    return pack("U", $unicode);
+    my $result =  pack("U", $unicode);
+    return $result;
 }
 
 
@@ -969,9 +983,16 @@ sub entity_to_latex {
 	return $latex;
     }
     # If the text is purely numeric we can do the UTF-8 conversion:
-
-    if ($entity =~ /^\d$/) {
+    # Otherwise there are a few textual entities that don't have good latex
+    # which can be converted to unicode:
+    #
+    if ($entity =~ /^\d+$/) {
 	return &entity_to_utf8($entity);
+    } else {
+	my $result = $utf_table{"$entity"};
+	if (defined $result) {
+	    return &entity_to_utf8($result);
+	}
     }
     #  Can't do the conversion`< ...