--- loncom/xml/lonxml.pm	2005/04/07 06:56:27	1.372
+++ loncom/xml/lonxml.pm	2006/06/27 14:22:39	1.413
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # XML Parser Module 
 #
-# $Id: lonxml.pm,v 1.372 2005/04/07 06:56:27 albertel Exp $
+# $Id: lonxml.pm,v 1.413 2006/06/27 14:22:39 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -40,7 +40,7 @@
 
 package Apache::lonxml; 
 use vars 
-qw(@pwd @outputstack $redirection $import @extlinks $metamode $evaluate %insertlist @namespace $errorcount $warningcount @htmlareafields);
+qw(@pwd @outputstack $redirection $import @extlinks $metamode $evaluate %insertlist @namespace $errorcount $warningcount);
 use strict;
 use HTML::LCParser();
 use HTML::TreeBuilder();
@@ -52,6 +52,7 @@ use Math::Random();
 use Opcode();
 use POSIX qw(strftime);
 use Time::HiRes qw( gettimeofday tv_interval );
+use Symbol();
 
 sub register {
   my ($space,@taglist) = @_;
@@ -122,9 +123,6 @@ $evaluate = 1;
 # stores the list of active tag namespaces
 @namespace=();
 
-# has the dynamic menu been updated to know about this resource
-$Apache::lonxml::registered=0;
-
 # a pointer the the Apache request object
 $Apache::lonxml::request='';
 
@@ -148,26 +146,17 @@ $Apache::lonxml::post_evaluate=1;
 #a header message to emit in the case of any generated warning or errors
 $Apache::lonxml::warnings_error_header='';
 
-sub xmlbegin {
-    my ($style)=@_;
-    my $output='';
-    @htmlareafields=();
-    if ($env{'browser.mathml'}) {
-	$output='<?xml version="1.0"?>'
-            #.'<?xml-stylesheet type="text/css" href="/adm/MathML/mathml.css"?>'."\n"
-#            .'<!DOCTYPE html SYSTEM "/adm/MathML/mathml.dtd" '
-            
-#	    .'<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" [<!ENTITY mathns "http://www.w3.org/1998/Math/MathML">] >'
-	    .'<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1 plus MathML 2.0 plus SVG 1.1//EN" "http://www.w3.org/2002/04/xhtml-math-svg/xhtml-math-svg.dtd">'
-            .'<html xmlns:math="http://www.w3.org/1998/Math/MathML" ' 
-	    .'xmlns="http://www.w3.org/1999/xhtml">';
-    } else {
-	$output='<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html>';
-    }
-    if ($style eq 'encode') {
-	$output=&HTML::Entities::encode($output,'<>&"');
-    }
-    return $output;
+#  Control whether or not LaTeX symbols should be substituted for their
+#  \ style equivalents...this may be turned off e.g. in an verbatim
+#  environment.
+
+$Apache::lonxml::substitute_LaTeX_symbols = 1; # Starts out on.
+
+sub enable_LaTeX_substitutions {
+    $Apache::lonxml::substitute_LaTeX_symbols = 1;
+}
+sub disable_LaTeX_substitutions {
+    $Apache::lonxml::substitute_LaTeX_symbols = 0;
 }
 
 sub xmlend {
@@ -180,8 +169,8 @@ sub xmlend {
 	$status=$Apache::inputtags::status[-1]; 
     }
     my $discussion;
-    &Apache::loncommon::get_unprocessed_cgi
-        ($env{'query_string'},['LONCAPA_INTERNAL_no_discussion']);
+    &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
+					   ['LONCAPA_INTERNAL_no_discussion']);
     if (! exists($env{'form.LONCAPA_INTERNAL_no_discussion'}) ||
         $env{'form.LONCAPA_INTERNAL_no_discussion'} ne 'true') {
         $discussion=&Apache::lonfeedback::list_discussion($mode,$status);
@@ -190,9 +179,9 @@ sub xmlend {
 	$discussion.='<tex>\keephidden{ENDOFPROBLEM}\vskip 0.5mm\noindent\makebox[\textwidth/$number_of_columns][b]{\hrulefill}\end{document}</tex>';
 	&Apache::lonxml::newparser($parser,\$discussion,'');
 	return '';
-    } else {
-	return $discussion.&Apache::loncommon::endbodytag();
     }
+
+    return $discussion;
 }
 
 sub tokeninputfield {
@@ -272,13 +261,7 @@ sub printtokenheader {
         $tcrsid=$courseid;
     }
 
-    my %reply=&Apache::lonnet::get('environment',
-              ['firstname','middlename','lastname','generation'],
-              $tudom,$tuname);
-    my $plainname=$reply{'firstname'}.' '. 
-                  $reply{'middlename'}.' '.
-                  $reply{'lastname'}.' '.
-		  $reply{'generation'};
+    my $plainname=&Apache::loncommon::plainname($tuname,$tudom);
 
     if ($target eq 'web') {
         my %idhash=&Apache::lonnet::idrget($tudom,($tuname));
@@ -296,18 +279,6 @@ sub printtokenheader {
     }
 }
 
-sub fontsettings {
-    my $headerstring='';
-    if (($env{'browser.os'} eq 'mac') && (!$env{'browser.mathml'})) { 
-	$headerstring.=
-	    '<meta Content-Type="text/html; charset=x-mac-roman" />';
-    } elsif (!$env{'browser.mathml'} && $env{'browser.unicode'}) {
-	$headerstring.=
-	    '<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />';
-    }
-    return $headerstring;
-}
-
 sub printalltags {
   my $temp;
   foreach $temp (sort keys %Apache::lonxml::alltags) {
@@ -369,48 +340,31 @@ sub xmlparse {
  &initdepth();
  &init_alarm();
  my $finaloutput = &inner_xmlparse($target,\@stack,\@parstack,\@pars,
-				   $safeeval,\%style_for_target);
+				   $safeeval,\%style_for_target,1);
 
  if ($env{'request.uri'}) {
     &writeallows($env{'request.uri'});
  }
  &do_registered_ssi();
  if ($Apache::lonxml::counter_changed) { &store_counter() }
+
+ &clean_safespace($safeeval);
+
  if ($env{'form.return_only_error_and_warning_counts'}) {
      return "$errorcount:$warningcount";
  }
  return $finaloutput;
 }
 
-sub htmlclean {
-    my ($raw,$full)=@_;
-# Take care of CRLF etc
-
-    $raw=~s/\r\f/\n/gs; $raw=~s/\f\r/\n/gs;
-    $raw=~s/\r\n/\n/gs; $raw=~s/\n\r/\n/gs;
-    $raw=~s/\f/\n/gs; $raw=~s/\r/\n/gs;
-    $raw=~s/\&\#10\;/\n/gs; $raw=~s/\&\#13\;/\n/gs;
-
-# Generate empty tags, remove wrong end tags
-    $raw=~s/\<(br|hr|img|meta|allow|basefont)([^\>\/]*?)\>/\<$1$2 \/\>/gis;
-    $raw=~s/\<\/(br|hr|img|meta|allow|basefont)\>//gis;
-    unless ($full) {
-       $raw=~s/\<[\/]*(body|head|html)\>//gis;
-    }
-# Make standard tags lowercase
-    foreach ('html','body','head','meta','h1','h2','h3','h4','b','i','m',
-             'table','tr','td','th','p','br','hr','img','embed','font',
-             'a','strong','center','title','basefont','li','ol','ul',
-             'input','select','form','option','script','pre') {
-	$raw=~s/\<$_\s*\>/\<$_\>/gis;
-        $raw=~s/\<\/$_\s*\>/<\/$_\>/gis;
-        $raw=~s/\<$_\s([^\>]*)\>/<$_ $1\>/gis;
-    }
-    return $raw;
-}
-
 sub latex_special_symbols {
     my ($string,$where)=@_;
+    #
+    #  If e.g. in verbatim mode, then don't substitute.
+    #  but return original string.
+    #
+    if (!($Apache::lonxml::substitute_LaTeX_symbols)) {
+	return $string;
+    }
     if ($where eq 'header') {
 	$string =~ s/(\\|_|\^)/ /g;
 	$string =~ s/(\$|%|\{|\})/\\$1/g;
@@ -424,6 +378,7 @@ sub latex_special_symbols {
 	$string=~s/\\\%|\%/\\\%/g;
 	$string=~s/\\{|{/\\{/g;
 	$string=~s/\\}|}/\\}/g;
+	$string=~s/\\ensuremath\\{\\backslash\\}/\\ensuremath{\\backslash}/g;
 	$string=~s/\\\$|\$/\\\$/g;
 	$string=~s/\\\_|\_/\\\_/g;
         $string=~s/([^\\]|^)(\~|\^)/$1\\$2\\strut /g;
@@ -439,11 +394,12 @@ sub latex_special_symbols {
 }
 
 sub inner_xmlparse {
-  my ($target,$stack,$parstack,$pars,$safeeval,$style_for_target)=@_;
+  my ($target,$stack,$parstack,$pars,$safeeval,$style_for_target,$start)=@_;
   my $finaloutput = '';
   my $result;
   my $token;
   my $dontpop=0;
+  my $startredirection = $Apache::lonxml::redirection;
   while ( $#$pars > -1 ) {
     while ($token = $$pars['-1']->get_token) {
       if (($token->[0] eq 'T') || ($token->[0] eq 'C') ) {
@@ -553,7 +509,12 @@ sub inner_xmlparse {
   #   $finaloutput.=&endredirection;
   # }
 
-
+  if ( $start && $target eq 'grade') { &endredirection(); }
+  if ( $Apache::lonxml::redirection > $startredirection) {
+      while ($Apache::lonxml::redirection > $startredirection) {
+	  $finaloutput .= &endredirection();
+      }
+  }
   if (($ENV{'QUERY_STRING'}) && ($target eq 'web')) {
     $finaloutput=&afterburn($finaloutput);
   }	    
@@ -639,8 +600,6 @@ sub callsub {
 sub setup_globals {
   my ($request,$target)=@_;
   $Apache::lonxml::request=$request;
-  $Apache::lonxml::registered = 0;
-  @Apache::lonxml::htmlareafields=();
   $errorcount=0;
   $warningcount=0;
   $Apache::lonxml::default_homework_loaded=0;
@@ -651,6 +610,7 @@ sub setup_globals {
   @Apache::lonxml::ssi_info=();
   $Apache::lonxml::post_evaluate=1;
   $Apache::lonxml::warnings_error_header='';
+  $Apache::lonxml::substitute_LaTeX_symbols = 1;
   if ($target eq 'meta') {
     $Apache::lonxml::redirection = 0;
     $Apache::lonxml::metamode = 1;
@@ -662,7 +622,7 @@ sub setup_globals {
     $Apache::lonxml::evaluate = 1;
     $Apache::lonxml::import = 1;
   } elsif ($target eq 'grade') {
-    &startredirection;
+    &startredirection(); #ended in inner_xmlparse on exit
     $Apache::lonxml::metamode = 0;
     $Apache::lonxml::evaluate = 1;
     $Apache::lonxml::import = 1;
@@ -691,6 +651,9 @@ sub setup_globals {
 
 sub init_safespace {
   my ($target,$safeeval,$safehole,$safeinit) = @_;
+  $safeeval->deny_only(':dangerous');
+  $safeeval->reval('use Math::Complex;');
+  $safeeval->permit_only(":default");
   $safeeval->permit("entereval");
   $safeeval->permit(":base_math");
   $safeeval->permit("sort");
@@ -748,6 +711,36 @@ sub init_safespace {
   $safehole->wrap(\&Math::Cephes::stdtr ,$safeeval,'&stdtr' );
   $safehole->wrap(\&Math::Cephes::stdtri,$safeeval,'&stdtri');
 
+  $safehole->wrap(\&Math::Cephes::Matrix::mat,$safeeval,'&mat');
+  $safehole->wrap(\&Math::Cephes::Matrix::new,$safeeval,
+		  '&Math::Cephes::Matrix::new');
+  $safehole->wrap(\&Math::Cephes::Matrix::coef,$safeeval,
+		  '&Math::Cephes::Matrix::coef');
+  $safehole->wrap(\&Math::Cephes::Matrix::clr,$safeeval,
+		  '&Math::Cephes::Matrix::clr');
+  $safehole->wrap(\&Math::Cephes::Matrix::add,$safeeval,
+		  '&Math::Cephes::Matrix::add');
+  $safehole->wrap(\&Math::Cephes::Matrix::sub,$safeeval,
+		  '&Math::Cephes::Matrix::sub');
+  $safehole->wrap(\&Math::Cephes::Matrix::mul,$safeeval,
+		  '&Math::Cephes::Matrix::mul');
+  $safehole->wrap(\&Math::Cephes::Matrix::div,$safeeval,
+		  '&Math::Cephes::Matrix::div');
+  $safehole->wrap(\&Math::Cephes::Matrix::inv,$safeeval,
+		  '&Math::Cephes::Matrix::inv');
+  $safehole->wrap(\&Math::Cephes::Matrix::transp,$safeeval,
+		  '&Math::Cephes::Matrix::transp');
+  $safehole->wrap(\&Math::Cephes::Matrix::simq,$safeeval,
+		  '&Math::Cephes::Matrix::simq');
+  $safehole->wrap(\&Math::Cephes::Matrix::mat_to_vec,$safeeval,
+		  '&Math::Cephes::Matrix::mat_to_vec');
+  $safehole->wrap(\&Math::Cephes::Matrix::vec_to_mat,$safeeval,
+		  '&Math::Cephes::Matrix::vec_to_mat');
+  $safehole->wrap(\&Math::Cephes::Matrix::check,$safeeval,
+		  '&Math::Cephes::Matrix::check');
+  $safehole->wrap(\&Math::Cephes::Matrix::check,$safeeval,
+		  '&Math::Cephes::Matrix::check');
+
 #  $safehole->wrap(\&Math::Cephes::new_fract,$safeeval,'&new_fract');
 #  $safehole->wrap(\&Math::Cephes::radd,$safeeval,'&radd');
 #  $safehole->wrap(\&Math::Cephes::rsub,$safeeval,'&rsub');
@@ -784,13 +777,46 @@ sub init_safespace {
 # $safeeval->deny(":base_orig");
   $safeeval->permit("require");
   $safeinit .= ';$external::target="'.$target.'";';
-  my $rndseed;
-  my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
-  $rndseed=&Apache::lonnet::rndseed($symb,$courseid,$domain,$name);
-  $safeinit .= ';$external::randomseed="'.$rndseed.'";';
-  &Apache::lonxml::debug("Setting rndseed to $rndseed");
   &Apache::run::run($safeinit,$safeeval);
+  &initialize_rndseed($safeeval);
+}
+
+sub clean_safespace {
+    my ($safeeval) = @_;
+    delete_package_recurse($safeeval->{Root});
+}
+
+sub delete_package_recurse {
+     my ($package) = @_;
+     my @subp;
+     {
+	 no strict 'refs';
+	 while (my ($key,$val) = each(%{*{"$package\::"}})) {
+	     if (!defined($val)) { next; }
+	     local (*ENTRY) = $val;
+	     if (defined *ENTRY{HASH} && $key =~ /::$/ &&
+		 $key ne "main::" && $key ne "<none>::")
+	     {
+		 my ($p) = $package ne "main" ? "$package\::" : "";
+		 ($p .= $key) =~ s/::$//;
+		 push(@subp,$p);
+	     }
+	 }
+     }
+     foreach my $p (@subp) {
+	 delete_package_recurse($p);
+     }
+     Symbol::delete_package($package);
+}
 
+sub initialize_rndseed {
+    my ($safeeval)=@_;
+    my $rndseed;
+    my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
+    $rndseed=&Apache::lonnet::rndseed($symb,$courseid,$domain,$name);
+    my $safeinit = '$external::randomseed="'.$rndseed.'";';
+    &Apache::lonxml::debug("Setting rndseed to $rndseed");
+    &Apache::run::run($safeinit,$safeeval);
 }
 
 sub default_homework_load {
@@ -839,7 +865,7 @@ sub startredirection {
 
 sub endredirection {
     if (!$Apache::lonxml::redirection) {
-	&Apache::lonxml::error("Endredirection was called, before a startredirection, perhaps you have unbalanced tags. Some debuging information:".join ":",caller);
+	&Apache::lonxml::error("Endredirection was called before a startredirection, perhaps you have unbalanced tags. Some debugging information:".join ":",caller);
 	return '';
     }
     $Apache::lonxml::redirection--;
@@ -906,6 +932,16 @@ sub decreasedepth {
 #print "<br />e $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1] : $curdepth\n";
 }
 
+sub get_id {
+    my ($parstack,$safeeval)=@_;
+    my $id= &Apache::lonxml::get_param('id',$parstack,$safeeval);
+    if ($env{'request.state'} eq 'construct' && $id =~ /(\.|_)/) {
+	&error(&mt("IDs are not allowed to contain &quot;<tt>_</tt>&quot; or &quot;<tt>.</tt>&quot;"));
+    }
+    if ($id =~ /^\s*$/) { $id = $Apache::lonxml::curdepth; }
+    return $id;
+}
+
 sub get_all_text_unbalanced {
 #there is a copy of this in lonpublisher.pm
     my($tag,$pars)= @_;
@@ -914,7 +950,11 @@ sub get_all_text_unbalanced {
     $tag='<'.$tag.'>';
     while ($token = $$pars[-1]->get_token) {
 	if (($token->[0] eq 'T')||($token->[0] eq 'C')||($token->[0] eq 'D')) {
-	    $result.=$token->[1];
+	    if ($token->[0] eq 'T' && $token->[2]) {
+		$result.='<![CDATA['.$token->[1].']]>';
+	    } else {
+		$result.=$token->[1];
+	    }
 	} elsif ($token->[0] eq 'PI') {
 	    $result.=$token->[2];
 	} elsif ($token->[0] eq 'S') {
@@ -945,7 +985,10 @@ sub increment_counter {
 }
 
 sub init_counter {
-    if (defined($env{'form.counter'})) {
+    if ($env{'request.state'} eq 'construct') {
+	$Apache::lonxml::counter=1;
+	$Apache::lonxml::counter_changed=1;
+    } elsif (defined($env{'form.counter'})) {
 	$Apache::lonxml::counter=$env{'form.counter'};
 	$Apache::lonxml::counter_changed=0;
     } else {
@@ -956,9 +999,36 @@ sub init_counter {
 
 sub store_counter {
     &Apache::lonnet::appenv(('form.counter' => $Apache::lonxml::counter));
+    $Apache::lonxml::counter_changed=0;
     return '';
 }
 
+{
+    my $state;
+    sub clear_problem_counter {
+	undef($state);
+	&Apache::lonnet::delenv('form.counter');
+	&Apache::lonxml::init_counter();
+	&Apache::lonxml::store_counter();
+    }
+
+    sub remember_problem_counter {
+	&Apache::lonnet::transfer_profile_to_env();
+	$state = $env{'form.counter'};
+    }
+
+    sub restore_problem_counter {
+	if (defined($state)) {
+	    &Apache::lonnet::appenv(('form.counter' => $state));
+	}
+    }
+    sub get_problem_counter {
+	if ($Apache::lonxml::counter_changed) { &store_counter() }
+	&Apache::lonnet::transfer_profile_to_env();
+	return $env{'form.counter'};
+    }
+}
+
 sub get_all_text {
     my($tag,$pars,$style)= @_;
     my $gotfullstack=1;
@@ -980,7 +1050,11 @@ sub get_all_text {
 	    while (($depth >=0) && ($token = $$pars[-1]->get_token)) {
 		#&Apache::lonxml::debug("e token:$token->[0]:$depth:$token->[1]:".$#$pars.":".$#Apache::lonxml::pwd);
 		if (($token->[0] eq 'T')||($token->[0] eq 'C')||($token->[0] eq 'D')) {
-		    $result.=$token->[1];
+		    if ($token->[2]) {
+			$result.='<![CDATA['.$token->[1].']]>';
+		    } else {
+			$result.=$token->[1];
+		    }
 		} elsif ($token->[0] eq 'PI') {
 		    $result.=$token->[2];
 		} elsif ($token->[0] eq 'S') {
@@ -1032,7 +1106,11 @@ sub get_all_text {
 		#&Apache::lonxml::debug("s token:$token->[0]:$depth:$token->[1]");
 		if (($token->[0] eq 'T')||($token->[0] eq 'C')||
 		    ($token->[0] eq 'D')) {
-		    $result.=$token->[1];
+		    if ($token->[2]) {
+			$result.='<![CDATA['.$token->[1].']]>';
+		    } else {
+			$result.=$token->[1];
+		    }
 		} elsif ($token->[0] eq 'PI') {
 		    $result.=$token->[2];
 		} elsif ($token->[0] eq 'S') {
@@ -1085,9 +1163,17 @@ sub parstring {
   return $temp;
 }
 
+sub extlink {
+    my ($res,$exact)=@_;
+    if (!$exact) {
+	$res=&Apache::lonnet::hreflocation($Apache::lonxml::pwd[-1],$res);
+    }
+    push(@Apache::lonxml::extlinks,$res)	 
+}
+
 sub writeallows {
     unless ($#extlinks>=0) { return; }
-    my $thisurl='/res/'.&Apache::lonnet::declutter(shift);
+    my $thisurl = &Apache::lonnet::clutter(shift);
     if ($env{'httpref.'.$thisurl}) {
 	$thisurl=$env{'httpref.'.$thisurl};
     }
@@ -1169,7 +1255,6 @@ sub createnewhtml {
     my $title=&mt('Title of document goes here');
     my $body=&mt('Body of document goes here');
     my $filecontents=(<<SIMPLECONTENT);
-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml/11/DTD/xhtml11.dtd">
 <html>
 <head>
 <title>$title</title>
@@ -1203,8 +1288,7 @@ sub inserteditinfo {
       my $initialize='';
       if ($filetype eq 'html') {
 	  my $addbuttons=&Apache::lonhtmlcommon::htmlareaaddbuttons();
-	  $initialize=&Apache::lonhtmlcommon::htmlareaheaders().
-	      &Apache::lonhtmlcommon::spellheader();
+	  $initialize=&Apache::lonhtmlcommon::spellheader();
 	  if (!&Apache::lonhtmlcommon::htmlareablocked() &&
 	      &Apache::lonhtmlcommon::htmlareabrowser()) {
 	      $initialize.=(<<FULLPAGE);
@@ -1233,10 +1317,7 @@ FULLPAGE
 	  $xml_help=&Apache::loncommon::helpLatexCheatsheet();
       }
       my $cleanbut = '';
-      if ($filetype eq 'html') {
-	  $cleanbut='<input type="submit" name="attemptclean" value="'.
-	      &mt('Save and then attempt to clean HTML').'" />';
-      }
+
       my $titledisplay=&display_title();
       my %lt=&Apache::lonlocal::texthash('st' => 'Save this',
 					 'vi' => 'View',
@@ -1324,7 +1405,7 @@ sub handler {
 # Edit action? Save file.
 #
     unless ($env{'request.state'} eq 'published') {
-	if (($env{'form.savethisfile'}) || ($env{'form.attemptclean'})) {
+	if ($env{'form.savethisfile'}) {
 	    if (&storefile($file,$env{'form.filecont'})) {
 		&Apache::lonxml::info("<font COLOR=\"#0000FF\">".
 				      &mt('Updated').": ".
@@ -1337,17 +1418,13 @@ sub handler {
     my $result = '';
     my $filecontents=&Apache::lonnet::getfile($file);
     if ($filecontents eq -1) {
-	my $bodytag=&Apache::loncommon::bodytag('File Error');
+	my $start_page=&Apache::loncommon::start_page('File Error');
+	my $end_page=&Apache::loncommon::end_page();
 	my $fnf=&mt('File not found');
 	$result=(<<ENDNOTFOUND);
-<html>
-<head>
-<title>$fnf</title>
-</head>
-$bodytag
+$start_page
 <b>$fnf: $file</b>
-</body>
-</html>
+$end_page
 ENDNOTFOUND
         $filecontents='';
 	if ($env{'request.state'} ne 'published') {
@@ -1361,21 +1438,20 @@ ENDNOTFOUND
     } else {
 	unless ($env{'request.state'} eq 'published') {
 	    if ($filecontents=~/BEGIN LON-CAPA Internal/) {
-		&Apache::lonxml::error(&mt('This file appears to be a rendering of a Lon-CAPA resource. If this is correct, this resource will act very oddly and incorrectly.'));
-	    }
-
-	    if ($env{'form.attemptclean'}) {
-		$filecontents=&htmlclean($filecontents,1);
+		&Apache::lonxml::error(&mt('This file appears to be a rendering of a LON-CAPA resource. If this is correct, this resource will act very oddly and incorrectly.'));
 	    }
 #
 # we are in construction space, see if edit mode forced
-            &Apache::loncommon::get_unprocessed_cgi
-                          ($ENV{'QUERY_STRING'},['editmode']);
+            &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
+						    ['editmode']);
 	}
 	if (!$env{'form.editmode'} || $env{'form.viewmode'}) {
 	    $result = &Apache::lonxml::xmlparse($request,$target,$filecontents,
 						'',%mystyle);
 	    undef($Apache::lonhomework::parsing_a_task);
+	    &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
+						    ['rawmode']);
+	    if ($env{'form.rawmode'}) { $result = $filecontents; }
 	}
     }
     
@@ -1386,18 +1462,20 @@ ENDNOTFOUND
 	if ($env{'form.editmode'} && (!($env{'form.viewmode'}))) {
 	    my $displayfile=$request->uri;
 	    $displayfile=~s/^\/[^\/]*//;
-	    my $bodytag='<body bgcolor="#FFFFFF">';
-	    if ($env{'environment.remote'} eq 'off') {
-		$bodytag=&Apache::loncommon::bodytag();
+	    my %options = ();
+	    if ($env{'environment.remote'} ne 'off') {
+		$options{'bgcolor'}   = '#FFFFFF';
 	    }
-	    $result='<html>'.$bodytag.
+	    my $start_page = &Apache::loncommon::start_page(undef,undef,
+							    \%options);
+	    $result=$start_page.
 		&Apache::lonxml::message_location().'<h3>'.
 		$displayfile.
-		'</h3></body></html>';
+		'</h3>'.&Apache::loncommon::end_page();
 	    $result=&inserteditinfo($result,$filecontents,$filetype);
 	}
     }
-    if ($filetype eq 'html') { writeallows($request->uri); }
+    if ($filetype eq 'html') { &writeallows($request->uri); }
 	
     
     &Apache::lonxml::add_messages(\$result);
@@ -1423,7 +1501,12 @@ sub debug {
     if ($Apache::lonxml::debug eq "1") {
 	$|=1;
 	my $request=$Apache::lonxml::request;
-	if (!$request) { $request=Apache->request; }
+	if (!$request) {
+	    eval { $request=Apache->request; };
+	}
+	if (!$request) {
+	    eval { $request=Apache2::RequestUtil->request; };
+	}
 	$request->print('<font size="-2"><pre>DEBUG:'.&HTML::Entities::encode($_[0],'<>&"')."</pre></font>\n");
 	#&Apache::lonnet::logthis($_[0]);
     }
@@ -1455,19 +1538,33 @@ sub error {
 	if ( !$symb ) {
 	    #public or browsers
 	    $errormsg=&mt("An error occured while processing this resource. The author has been notified.");
-	} 
+	}
+	my $host=$Apache::lonnet::perlvar{'lonHostID'};
+	my $msg = join('<br />',(@_,"The occured on host <tt>$host</tt>"));
 	#notify author
-	&Apache::lonmsg::author_res_msg($env{'request.filename'},join('<br />',@_));
+	&Apache::lonmsg::author_res_msg($env{'request.filename'},$msg);
 	#notify course
 	if ( $symb && $env{'request.course.id'} ) {
+	    my $cnum=$env{'course.'.$env{'request.course.id'}.'.num'};
+	    my $cdom=$env{'course.'.$env{'request.course.id'}.'.domain'};
 	    my (undef,%users)=&Apache::lonfeedback::decide_receiver(undef,0,1,1,1);
 	    my $declutter=&Apache::lonnet::declutter($env{'request.filename'});
 	    my @userlist;
 	    foreach (keys %users) {
 		my ($user,$domain) = split(/:/, $_);
 		push(@userlist,"$user\@$domain");
-		&Apache::lonmsg::user_normal_msg($user,$domain,
-						 "Error [$declutter]",join('<br />',@_));
+		my $key=$declutter.'_'.$user.'_'.$domain;
+		my %lastnotified=&Apache::lonnet::get('nohist_xmlerrornotifications',
+						      [$key],
+						      $cdom,$cnum);
+		my $now=time;
+		if ($now-$lastnotified{$key}>86400) {
+		    &Apache::lonmsg::user_normal_msg($user,$domain,
+						 "Error [$declutter]",$msg);
+		    &Apache::lonnet::put('nohist_xmlerrornotifications',
+					 {$key => $now},
+					 $cdom,$cnum);		
+		}
 	    }
 	    if ($env{'request.role.adv'}) {
 		$errormsg=&mt("An error occured while processing this resource. The course personnel ([_1]) and the author have been notified.",join(', ',@userlist));
@@ -1484,8 +1581,6 @@ sub warning {
   
     if ($env{'form.grade_target'} ne 'tex') {
 	if ( &show_error_warn_msg() ) {
-	    my $request=$Apache::lonxml::request;
-	    if (!$request) { $request=Apache->request; }
 	    push(@Apache::lonxml::warning_messages,
 		 $Apache::lonxml::warnings_error_header.
 		 "<b>W</b>ARNING<b>:</b>".join('<br />',@_)."<br />\n");