/[Biblio-Isis]/trunk/lib/Biblio/Isis.pm
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trunk/IsisDB.pm revision 32 by dpavlin, Wed Jan 5 15:46:26 2005 UTC trunk/lib/Biblio/Isis.pm revision 67 by dpavlin, Fri Aug 25 16:35:47 2006 UTC
# Line 1  Line 1 
1  package IsisDB;  package Biblio::Isis;
2  use strict;  use strict;
3    
4  use Carp;  use Carp;
5  use File::Glob qw(:globally :nocase);  use File::Glob qw(:globally :nocase);
6    
 use Data::Dumper;  
   
7  BEGIN {  BEGIN {
8          use Exporter ();          use Exporter ();
9          use vars qw ($VERSION @ISA @EXPORT @EXPORT_OK %EXPORT_TAGS);          use vars qw ($VERSION @ISA @EXPORT @EXPORT_OK %EXPORT_TAGS);
10          $VERSION     = 0.09;          $VERSION     = 0.23;
11          @ISA         = qw (Exporter);          @ISA         = qw (Exporter);
12          #Give a hoot don't pollute, do not export more than needed by default          #Give a hoot don't pollute, do not export more than needed by default
13          @EXPORT      = qw ();          @EXPORT      = qw ();
# Line 20  BEGIN { Line 18  BEGIN {
18    
19  =head1 NAME  =head1 NAME
20    
21  IsisDB - Read CDS/ISIS, WinISIS and IsisMarc database  Biblio::Isis - Read CDS/ISIS, WinISIS and IsisMarc database
22    
23  =head1 SYNOPSIS  =head1 SYNOPSIS
24    
25    use IsisDB;    use Biblio::Isis;
26    
27    my $isis = new IsisDB(    my $isis = new Biblio::Isis(
28          isisdb => './cds/cds',          isisdb => './cds/cds',
29    );    );
30    
# Line 81  rarely an issue). Line 79  rarely an issue).
79    
80  Open ISIS database  Open ISIS database
81    
82   my $isis = new IsisDB(   my $isis = new Biblio::Isis(
83          isisdb => './cds/cds',          isisdb => './cds/cds',
84          read_fdt => 1,          read_fdt => 1,
85          include_deleted => 1,          include_deleted => 1,
86          hash_filter => sub {          hash_filter => sub {
87                  my $v = shift;                  my ($v,$field_number) = @_;
88                  $v =~ s#foo#bar#g;                  $v =~ s#foo#bar#g;
89          },          },
90          debug => 1,          debug => 1,
91            join_subfields_with => ' ; ',
92   );   );
93    
94  Options are described below:  Options are described below:
# Line 115  Don't skip logically deleted records in Line 114  Don't skip logically deleted records in
114    
115  =item hash_filter  =item hash_filter
116    
117  Filter code ref which will be used before data is converted to hash.  Filter code ref which will be used before data is converted to hash. It will
118    receive two arguments, whole line from current field (in C<< $_[0] >>) and
119    field number (in C<< $_[1] >>).
120    
121  =item debug  =item debug
122    
123  Dump a B<lot> of debugging output.  Dump a B<lot> of debugging output even at level 1. For even more increase level.
124    
125    =item join_subfields_with
126    
127    Define delimiter which will be used to join repeatable subfields. This
128    option is included to support lagacy application written against version
129    older than 0.21 of this module. By default, it disabled. See L</to_hash>.
130    
131  =back  =back
132    
# Line 147  sub new { Line 154  sub new {
154          push @must_exist, "fdt" if ($self->{read_fdt});          push @must_exist, "fdt" if ($self->{read_fdt});
155    
156          foreach my $ext (@must_exist) {          foreach my $ext (@must_exist) {
157                  croak "missing ",uc($ext)," file in ",$self->{isisdb} unless ($self->{$ext."_file"});                  unless ($self->{$ext."_file"}) {
158                            carp "missing ",uc($ext)," file in ",$self->{isisdb};
159                            return;
160                    }
161          }          }
162    
163          print STDERR "## using files: ",join(" ",@isis_files),"\n" if ($self->{debug});          if ($self->{debug}) {
164                    print STDERR "## using files: ",join(" ",@isis_files),"\n";
165                    eval "use Data::Dump";
166    
167                    if (! $@) {
168                            *Dumper = *Data::Dump::dump;
169                    } else {
170                            use Data::Dumper;
171                    }
172            }
173    
174          # if you want to read .FDT file use read_fdt argument when creating class!          # if you want to read .FDT file use read_fdt argument when creating class!
175          if ($self->{read_fdt} && -e $self->{fdt_file}) {          if ($self->{read_fdt} && -e $self->{fdt_file}) {
# Line 158  sub new { Line 177  sub new {
177                  # read the $db.FDT file for tags                  # read the $db.FDT file for tags
178                  my $fieldzone=0;                  my $fieldzone=0;
179    
180                  open(fileFDT, $self->{fdt_file}) || croak "can't read '$self->{fdt_file}': $!";                  open(my $fileFDT, $self->{fdt_file}) || croak "can't read '$self->{fdt_file}': $!";
181                    binmode($fileFDT);
182    
183                  while (<fileFDT>) {                  while (<$fileFDT>) {
184                          chomp;                          chomp;
185                          if ($fieldzone) {                          if ($fieldzone) {
186                                  my $name=substr($_,0,30);                                  my $name=substr($_,0,30);
# Line 177  sub new { Line 197  sub new {
197                          }                          }
198                  }                  }
199                                    
200                  close(fileFDT);                  close($fileFDT);
201          }          }
202    
203          # Get the Maximum MFN from $db.MST          # Get the Maximum MFN from $db.MST
204    
205          open($self->{'fileMST'}, $self->{mst_file}) || croak "can't open '$self->{mst_file}': $!";          open($self->{'fileMST'}, $self->{mst_file}) || croak "can't open '$self->{mst_file}': $!";
206            binmode($self->{'fileMST'});
207    
208          # MST format:   (* = 32 bit signed)          # MST format:   (* = 32 bit signed)
209          # CTLMFN*       always 0          # CTLMFN*       always 0
# Line 190  sub new { Line 211  sub new {
211          # NXTMFB*       last block allocated to master file          # NXTMFB*       last block allocated to master file
212          # NXTMFP        offset to next available position in last block          # NXTMFP        offset to next available position in last block
213          # MFTYPE        always 0 for user db file (1 for system)          # MFTYPE        always 0 for user db file (1 for system)
214          seek($self->{'fileMST'},4,0);          seek($self->{'fileMST'},4,0) || croak "can't seek to offset 0 in MST: $!";
215    
216          my $buff;          my $buff;
217    
218          read($self->{'fileMST'}, $buff, 4);          read($self->{'fileMST'}, $buff, 4) || croak "can't read NXTMFN from MST: $!";
219          $self->{'NXTMFN'}=unpack("l",$buff) || carp "NXTNFN is zero";          $self->{'NXTMFN'}=unpack("V",$buff) || croak "NXTNFN is zero";
220    
221            print STDERR "## self ",Dumper($self),"\n" if ($self->{debug});
   
   
         print STDERR Dumper($self),"\n" if ($self->{debug});  
222    
223          # open files for later          # open files for later
224          open($self->{'fileXRF'}, $self->{xrf_file}) || croak "can't open '$self->{xrf_file}': $!";          open($self->{'fileXRF'}, $self->{xrf_file}) || croak "can't open '$self->{xrf_file}': $!";
225            binmode($self->{'fileXRF'});
226    
227          $self ? return $self : return undef;          $self ? return $self : return undef;
228  }  }
# Line 221  sub count { Line 240  sub count {
240          return $self->{'NXTMFN'} - 1;          return $self->{'NXTMFN'} - 1;
241  }  }
242    
 =head2 read_cnt  
   
 Read content of C<.CNT> file and return hash containing it.  
   
   print Dumper($isis->read_cnt);  
   
 This function is not used by module (C<.CNT> files are not required for this  
 module to work), but it can be useful to examine your index (while debugging  
 for example).  
   
 =cut  
   
 sub read_cnt  {  
         my $self = shift;  
   
         croak "missing CNT file in ",$self->{isisdb} unless ($self->{cnt_file});  
   
         # Get the index information from $db.CNT  
     
         open(fileCNT, $self->{cnt_file}) || croak "can't read '$self->{cnt_file}': $!";  
   
         my $buff;  
   
         read(fileCNT, $buff, 26);  
         $self->unpack_cnt($buff);  
   
         read(fileCNT, $buff, 26);  
         $self->unpack_cnt($buff);  
   
         close(fileCNT);  
   
         return $self->{cnt};  
 }  
   
 =head2 unpack_cnt  
   
 Unpack one of two 26 bytes fixed length record in C<.CNT> file.  
   
 Here is definition of record:  
   
  off key        description                             size  
   0: IDTYPE     BTree type                              s  
   2: ORDN       Nodes Order                             s  
   4: ORDF       Leafs Order                             s  
   6: N          Number of Memory buffers for nodes      s  
   8: K          Number of buffers for first level index s  
  10: LIV        Current number of Index Levels          s  
  12: POSRX      Pointer to Root Record in N0x           l  
  16: NMAXPOS    Next Available position in N0x          l  
  20: FMAXPOS    Next available position in L0x          l  
  24: ABNORMAL   Formal BTree normality indicator        s  
  length: 26 bytes  
   
 This will fill C<$self> object under C<cnt> with hash. It's used by C<read_cnt>.  
   
 =cut  
   
 sub unpack_cnt {  
         my $self = shift;  
   
         my @flds = qw(ORDN ORDF N K LIV POSRX NMAXPOS FMAXPOS ABNORMAL);  
   
         my $buff = shift || return;  
         my @arr = unpack("ssssssllls", $buff);  
   
         print STDERR "unpack_cnt: ",join(" ",@arr),"\n" if ($self->{'debug'});  
   
         my $IDTYPE = shift @arr;  
         foreach (@flds) {  
                 $self->{cnt}->{$IDTYPE}->{$_} = abs(shift @arr);  
         }  
 }  
   
243  =head2 fetch  =head2 fetch
244    
245  Read record with selected MFN  Read record with selected MFN
# Line 334  sub fetch { Line 280  sub fetch {
280    
281          # read XRFMFB abd XRFMFP          # read XRFMFB abd XRFMFP
282          read($self->{'fileXRF'}, $buff, 4);          read($self->{'fileXRF'}, $buff, 4);
283          my $pointer=unpack("l",$buff) || carp "pointer is null";          my $pointer=unpack("V",$buff);
284            if (! $pointer) {
285                    if ($self->{include_deleted}) {
286                            return;
287                    } else {
288                            warn "pointer for MFN $mfn is null\n";
289                            return;
290                    }
291            }
292    
293          # check for logically deleted record          # check for logically deleted record
294          if ($pointer < 0) {          if ($pointer & 0x80000000) {
295                  print STDERR "## record $mfn is logically deleted\n" if ($self->{debug});                  print STDERR "## record $mfn is logically deleted\n" if ($self->{debug});
296                  $self->{deleted} = $mfn;                  $self->{deleted} = $mfn;
297    
298                  return unless $self->{include_deleted};                  return unless $self->{include_deleted};
299    
300                  $pointer = abs($pointer);                  # abs
301                    $pointer = ($pointer ^ 0xffffffff) + 1;
302          }          }
303    
304          my $XRFMFB = int($pointer/2048);          my $XRFMFB = int($pointer/2048);
# Line 358  sub fetch { Line 313  sub fetch {
313    
314          # Get Record Information          # Get Record Information
315    
316          seek($self->{'fileMST'},$blk_off,0);          seek($self->{'fileMST'},$blk_off,0) || croak "can't seek to $blk_off: $!";
317    
318          read($self->{'fileMST'}, $buff, 4);          read($self->{'fileMST'}, $buff, 4) || croak "can't read 4 bytes at offset $blk_off from MST file: $!";
319          my $value=unpack("l",$buff);          my $value=unpack("V",$buff);
320    
321          print STDERR "## offset for rowid $value is $blk_off (blk $XRFMFB off $XRFMFP)\n" if ($self->{debug});          print STDERR "## offset for rowid $value is $blk_off (blk $XRFMFB off $XRFMFP)\n" if ($self->{debug});
322    
# Line 378  sub fetch { Line 333  sub fetch {
333    
334          read($self->{'fileMST'}, $buff, 14);          read($self->{'fileMST'}, $buff, 14);
335    
336          my ($MFRL,$MFBWB,$MFBWP,$BASE,$NVF,$STATUS) = unpack("slssss", $buff);          my ($MFRL,$MFBWB,$MFBWP,$BASE,$NVF,$STATUS) = unpack("vVvvvv", $buff);
337    
338          print STDERR "## MFRL: $MFRL MFBWB: $MFBWB MFBWP: $MFBWP BASE: $BASE NVF: $NVF STATUS: $STATUS\n" if ($self->{debug});          print STDERR "## MFRL: $MFRL MFBWB: $MFBWB MFBWP: $MFBWP BASE: $BASE NVF: $NVF STATUS: $STATUS\n" if ($self->{debug});
339    
# Line 398  sub fetch { Line 353  sub fetch {
353    
354          for (my $i = 0 ; $i < $NVF ; $i++) {          for (my $i = 0 ; $i < $NVF ; $i++) {
355    
356                  my ($TAG,$POS,$LEN) = unpack("sss", substr($buff,$i * 6, 6));                  my ($TAG,$POS,$LEN) = unpack("vvv", substr($buff,$i * 6, 6));
357    
358                  print STDERR "## TAG: $TAG POS: $POS LEN: $LEN\n" if ($self->{debug});                  print STDERR "## TAG: $TAG POS: $POS LEN: $LEN\n" if ($self->{debug});
359    
# Line 439  sub fetch { Line 394  sub fetch {
394          return $self->{'record'};          return $self->{'record'};
395  }  }
396    
397    =head2 mfn
398    
399    Returns current MFN position
400    
401      my $mfn = $isis->mfn;
402    
403    =cut
404    
405    # This function should be simple return $self->{current_mfn},
406    # but if new is called with _hack_mfn it becomes setter.
407    # It's useful in tests when setting $isis->{record} directly
408    
409    sub mfn {
410            my $self = shift;
411            return $self->{current_mfn};
412    };
413    
414    
415  =head2 to_ascii  =head2 to_ascii
416    
417  Returns ASCII output of record with specified MFN  Returns ASCII output of record with specified MFN
# Line 462  sub to_ascii { Line 435  sub to_ascii {
435    
436          my $mfn = shift || croak "need MFN";          my $mfn = shift || croak "need MFN";
437    
438          my $rec = $self->fetch($mfn);          my $rec = $self->fetch($mfn) || return;
439    
440          my $out = "0\t$mfn";          my $out = "0\t$mfn";
441    
# Line 518  which will be used for identifiers, C<i1 Line 491  which will be used for identifiers, C<i1
491               }               }
492             ],             ],
493    
494    In case there are repeatable subfields in record, this will create
495    following structure:
496    
497      '900' => [ {
498            'a' => [ 'foo', 'bar', 'baz' ],
499      }]
500    
501    Or in more complex example of
502    
503      902   ^aa1^aa2^aa3^bb1^aa4^bb2^cc1^aa5
504    
505    it will create
506    
507      902   => [
508            { a => ["a1", "a2", "a3", "a4", "a5"], b => ["b1", "b2"], c => "c1" },
509      ],
510    
511    This behaviour can be changed using C<join_subfields_with> option to L</new>,
512    in which case C<to_hash> will always create single value for each subfield.
513    This will change result to:
514    
515    
516    
517  This method will also create additional field C<000> with MFN.  This method will also create additional field C<000> with MFN.
518    
519    There is also more elaborative way to call C<to_hash> like this:
520    
521      my $hash = $isis->to_hash({
522            mfn => 42,
523            include_subfields => 1,
524      });
525    
526    Each option controll creation of hash:
527    
528    =over 4
529    
530    =item mfn
531    
532    Specify MFN number of record
533    
534    =item include_subfields
535    
536    This option will create additional key in hash called C<subfields> which will
537    have original record subfield order and index to that subfield like this:
538    
539      902   => [ {
540            a => ["a1", "a2", "a3", "a4", "a5"],
541            b => ["b1", "b2"],
542            c => "c1",
543            subfields => ["a", 0, "a", 1, "a", 2, "b", 0, "a", 3, "b", 1, "c", 0, "a", 4],
544      } ],
545    
546    =item join_subfields_with
547    
548    Define delimiter which will be used to join repeatable subfields. You can
549    specify option here instead in L</new> if you want to have per-record control.
550    
551    =item hash_filter
552    
553    You can override C<hash_filter> defined in L</new> using this option.
554    
555    =back
556    
557  =cut  =cut
558    
559  sub to_hash {  sub to_hash {
560          my $self = shift;          my $self = shift;
561    
562    
563          my $mfn = shift || confess "need mfn!";          my $mfn = shift || confess "need mfn!";
564            my $arg;
565    
566            my $hash_filter = $self->{hash_filter};
567    
568            if (ref($mfn) eq 'HASH') {
569                    $arg = $mfn;
570                    $mfn = $arg->{mfn} || confess "need mfn in arguments";
571                    $hash_filter = $arg->{hash_filter} if ($arg->{hash_filter});
572            }
573    
574          # init record to include MFN as field 000          # init record to include MFN as field 000
575          my $rec = { '000' => [ $mfn ] };          my $rec = { '000' => [ $mfn ] };
576    
577          my $row = $self->fetch($mfn);          my $row = $self->fetch($mfn) || return;
578    
579            my $j_rs = $arg->{join_subfields_with};
580            $j_rs = $self->{join_subfields_with} unless(defined($j_rs));
581            my $i_sf = $arg->{include_subfields};
582    
583          foreach my $k (keys %{$row}) {          foreach my $f_nr (keys %{$row}) {
584                  foreach my $l (@{$row->{$k}}) {                  foreach my $l (@{$row->{$f_nr}}) {
585    
586                          # filter output                          # filter output
587                          $l = $self->{'hash_filter'}->($l) if ($self->{'hash_filter'});                          $l = $hash_filter->($l, $f_nr) if ($hash_filter);
588                            next unless defined($l);
589    
590                          my $val;                          my $val;
591                            my $r_sf;       # repeatable subfields in this record
592    
593                          # has identifiers?                          # has identifiers?
594                          ($val->{'i1'},$val->{'i2'}) = ($1,$2) if ($l =~ s/^([01 #])([01 #])\^/\^/);                          ($val->{'i1'},$val->{'i2'}) = ($1,$2) if ($l =~ s/^([01 #])([01 #])\^/\^/);
# Line 547  sub to_hash { Line 597  sub to_hash {
597                          if ($l =~ m/\^/) {                          if ($l =~ m/\^/) {
598                                  foreach my $t (split(/\^/,$l)) {                                  foreach my $t (split(/\^/,$l)) {
599                                          next if (! $t);                                          next if (! $t);
600                                          $val->{substr($t,0,1)} = substr($t,1);                                          my ($sf,$v) = (substr($t,0,1), substr($t,1));
601                                            # XXX this might be option, but why?
602                                            next unless (defined($v) && $v ne '');
603    #                                       warn "### $f_nr^$sf:$v",$/ if ($self->{debug} > 1);
604    
605                                            if (ref( $val->{$sf} ) eq 'ARRAY') {
606    
607                                                    push @{ $val->{$sf} }, $v;
608    
609                                                    # record repeatable subfield it it's offset
610                                                    push @{ $val->{subfields} }, ( $sf, $#{ $val->{$sf} } ) if (! $j_rs && $i_sf);
611                                                    $r_sf->{$sf}++;
612    
613                                            } elsif (defined( $val->{$sf} )) {
614    
615                                                    # convert scalar field to array
616                                                    $val->{$sf} = [ $val->{$sf}, $v ];
617    
618                                                    push @{ $val->{subfields} }, ( $sf, 1 ) if (! $j_rs && $i_sf);
619                                                    $r_sf->{$sf}++;
620    
621                                            } else {
622                                                    $val->{$sf} = $v;
623                                                    push @{ $val->{subfields} }, ( $sf, 0 ) if ($i_sf);
624                                            }
625                                  }                                  }
626                          } else {                          } else {
627                                  $val = $l;                                  $val = $l;
628                          }                          }
629    
630                          push @{$rec->{$k}}, $val;                          if ($j_rs) {
631                                    map {
632                                            $val->{$_} = join($j_rs, @{ $val->{$_} });
633                                    } keys %$r_sf
634                            }
635    
636                            push @{$rec->{$f_nr}}, $val;
637                  }                  }
638          }          }
639    
# Line 574  sub tag_name { Line 654  sub tag_name {
654          return $self->{'TagName'}->{$tag} || $tag;          return $self->{'TagName'}->{$tag} || $tag;
655  }  }
656    
657    
658    =head2 read_cnt
659    
660    Read content of C<.CNT> file and return hash containing it.
661    
662      print Dumper($isis->read_cnt);
663    
664    This function is not used by module (C<.CNT> files are not required for this
665    module to work), but it can be useful to examine your index (while debugging
666    for example).
667    
668    =cut
669    
670    sub read_cnt  {
671            my $self = shift;
672    
673            croak "missing CNT file in ",$self->{isisdb} unless ($self->{cnt_file});
674    
675            # Get the index information from $db.CNT
676      
677            open(my $fileCNT, $self->{cnt_file}) || croak "can't read '$self->{cnt_file}': $!";
678            binmode($fileCNT);
679    
680            my $buff;
681    
682            read($fileCNT, $buff, 26) || croak "can't read first table from CNT: $!";
683            $self->unpack_cnt($buff);
684    
685            read($fileCNT, $buff, 26) || croak "can't read second table from CNT: $!";
686            $self->unpack_cnt($buff);
687    
688            close($fileCNT);
689    
690            return $self->{cnt};
691    }
692    
693    =head2 unpack_cnt
694    
695    Unpack one of two 26 bytes fixed length record in C<.CNT> file.
696    
697    Here is definition of record:
698    
699     off key        description                             size
700      0: IDTYPE     BTree type                              s
701      2: ORDN       Nodes Order                             s
702      4: ORDF       Leafs Order                             s
703      6: N          Number of Memory buffers for nodes      s
704      8: K          Number of buffers for first level index s
705     10: LIV        Current number of Index Levels          s
706     12: POSRX      Pointer to Root Record in N0x           l
707     16: NMAXPOS    Next Available position in N0x          l
708     20: FMAXPOS    Next available position in L0x          l
709     24: ABNORMAL   Formal BTree normality indicator        s
710     length: 26 bytes
711    
712    This will fill C<$self> object under C<cnt> with hash. It's used by C<read_cnt>.
713    
714    =cut
715    
716    sub unpack_cnt {
717            my $self = shift;
718    
719            my @flds = qw(ORDN ORDF N K LIV POSRX NMAXPOS FMAXPOS ABNORMAL);
720    
721            my $buff = shift || return;
722            my @arr = unpack("vvvvvvVVVv", $buff);
723    
724            print STDERR "unpack_cnt: ",join(" ",@arr),"\n" if ($self->{'debug'});
725    
726            my $IDTYPE = shift @arr;
727            foreach (@flds) {
728                    $self->{cnt}->{$IDTYPE}->{$_} = abs(shift @arr);
729            }
730    }
731    
732  1;  1;
733    
734  =head1 BUGS  =head1 BUGS
# Line 591  module with databases from programs othe Line 746  module with databases from programs othe
746  tested this against ouput of one C<isis.dll>-based application, but I don't  tested this against ouput of one C<isis.dll>-based application, but I don't
747  know any details about it's version.  know any details about it's version.
748    
749    =head1 VERSIONS
750    
751    As this is young module, new features are added in subsequent version. It's
752    a good idea to specify version when using this module like this:
753    
754      use Biblio::Isis 0.23
755    
756    Below is list of changes in specific version of module (so you can target
757    older versions if you really have to):
758    
759    =over 8
760    
761    =item 0.23
762    
763    Added C<hash_filter> to L</to_hash>
764    
765    =item 0.22
766    
767    Added field number when calling C<hash_filter>
768    
769    =item 0.21
770    
771    Added C<join_subfields_with> to L</new> and L</to_hash>.
772    
773    Added C<include_subfields> to L</to_hash>.
774    
775    =item 0.20
776    
777    Added C<< $isis->mfn >>, support for repeatable subfields and
778    C<< $isis->to_hash({ mfn => 42, ... }) >> calling convention
779    
780    =back
781    
782  =head1 AUTHOR  =head1 AUTHOR
783    
784          Dobrica Pavlinusic          Dobrica Pavlinusic
# Line 612  LICENSE file included with this module. Line 800  LICENSE file included with this module.
800    
801  =head1 SEE ALSO  =head1 SEE ALSO
802    
803    L<Biblio::Isis::Manual> for CDS/ISIS manual appendix F, G and H which describe file format
804    
805  OpenIsis web site L<http://www.openisis.org>  OpenIsis web site L<http://www.openisis.org>
806    
807  perl4lib site L<http://perl4lib.perl.org>  perl4lib site L<http://perl4lib.perl.org>
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