--- loncom/homework/structuretags.pm	2011/12/26 13:45:10	1.497.2.5
+++ loncom/homework/structuretags.pm	2011/12/27 19:48:31	1.497.2.6
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA 
 # definition of tags that give a structure to a document
 #
-# $Id: structuretags.pm,v 1.497.2.5 2011/12/26 13:45:10 foxr Exp $
+# $Id: structuretags.pm,v 1.497.2.6 2011/12/27 19:48:31 foxr Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -61,6 +61,7 @@ use Apache::lonlocal;
 use Apache::lonxml;
 use Apache::londefdef;
 use Apache::lonenc();
+use Apache::loncommon();
 use Time::HiRes qw( gettimeofday tv_interval );
 use lib '/home/httpd/lib/perl/';
 use LONCAPA;
@@ -110,6 +111,28 @@ sub select_hyphenation {
     }
 }
 ##
+# Selects hyphenation based on the current problem metadata.
+# This requires that
+# - There is a language metadata item set for the problem.
+# - The language has a latex/babel hyphenation.
+#
+# @note: Uses &Apache::lonxml::request to locate the Uri associated with
+#        this problem.
+# @return string (possibly empty).
+# @retval If not empty an appropriate \selectlanguage{} directive.
+#
+sub select_metadata_hyphenation {
+    my $uri      = $Apache::lonxml::request->uri;
+    my $language = &Apache::lonnet::metadata($uri, 'language'); 
+    my $latex_language = &Apache::loncommon::latexhyphenation($language);
+    if ($latex_language) {
+	return '\selectlanguage{'.$latex_language."}\n";
+    }
+    return '';			# no latex hyphenation or no lang metadata.
+}
+
+
+##
 #  Clears the set of languages required by the document being rendered.
 #
 sub clear_required_languages {
@@ -1286,6 +1309,8 @@ sub start_problem {
             }
 	} elsif ($target eq 'tex') {
 	    $result .= 'INSERTTEXFRONTMATTERHERE';
+	    $result .= &select_metadata_hyphenation();
+	    
 
 	}
     } elsif ($target eq 'edit') {
@@ -1799,6 +1824,7 @@ sub end_languageblock {
 		$result = &select_hyphenation($which);
 	    }
 	    $result .= $available_texts{$which};
+	    $result .= &select_metadata_hyphenation(); # Restore original language.
 	}
 	undef(%available_texts);
 	&Apache::lonxml::deregister('Apache::structuretags',('lang'));