--- loncom/lonnet/perl/lonnet.pm	2000/09/01 21:34:27	1.26
+++ loncom/lonnet/perl/lonnet.pm	2000/09/04 11:25:46	1.28
@@ -23,13 +23,15 @@
 # restore            : returns hash for this url
 # eget(namesp,array) : returns hash with keys from array filled in from namesp
 # get(namesp,array)  : returns hash with keys from array filled in from namesp
+# del(namesp,array)  : deletes keys out of arry from namesp
 # put(namesp,hash)   : stores hash in namesp
 # dump(namesp)       : dumps the complete namespace into a hash
 # ssi(url,hash)      : does a complete request cycle on url to localhost, posts
 #                      hash
 # repcopy(filename)  : replicate file
 # dirlist(url)       : gets a directory listing
-# condval(index)     : value of condition index based on state 
+# condval(index)     : value of condition index based on state
+# varval(name)       : value of a variable 
 #
 # 6/1/99,6/2,6/10,6/11,6/12,6/14,6/26,6/28,6/29,6/30,
 # 7/1,7/2,7/9,7/10,7/12,7/14,7/15,7/19,
@@ -41,7 +43,7 @@
 # 06/26 Ben Tyszka
 # 06/30,07/15,07/17,07/18,07/20,07/21,07/22,07/25 Gerd Kortemeyer
 # 08/14 Ben Tyszka
-# 08/22,08/28,08/31,09/01 Gerd Kortemeyer
+# 08/22,08/28,08/31,09/01,09/02 Gerd Kortemeyer
 
 package Apache::lonnet;
 
@@ -528,6 +530,19 @@ sub get {
    return %returnhash;
 }
 
+# --------------------------------------------------------------- del interface
+
+sub del {
+   my ($namespace,@storearr)=@_;
+   my $items='';
+   map {
+       $items.=escape($_).'&';
+   } @storearr;
+   $items=~s/\&$//;
+   return reply("del:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace:$items",
+                 $ENV{'user.home'});
+}
+
 # -------------------------------------------------------------- dump interface
 
 sub dump {
@@ -768,7 +783,7 @@ sub condval {
     my $condidx=shift;
     my $result=0;
     if ($ENV{'request.course'}) {
-       if ($ENV{'acc.cond.'.$ENV{'request.course'}.'.'.$condidx}) {
+       if (defined($ENV{'acc.cond.'.$ENV{'request.course'}.'.'.$condidx})) {
           my $operand='|';
 	  my @stack;
           map {
@@ -799,6 +814,19 @@ sub condval {
     return $result;
 }
 
+# --------------------------------------------------------- Value of a Variable
+
+sub varval {
+    my ($realm,$space,@components)=split(/\./,shift);
+    my $value='';
+    if ($realm eq 'user') {
+    } elsif ($realm eq 'course') {
+    } elsif ($realm eq 'session') {
+    } elsif ($realm eq 'system') {
+    }
+    return $value;
+}
+
 # -------------------------------------------------------- Escape Special Chars
 
 sub escape {