/[Biblio-Isis]/trunk/lib/Biblio/Isis.pm
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revision 8 by dpavlin, Wed Dec 29 15:17:59 2004 UTC revision 26 by dpavlin, Fri Dec 31 07:16:02 2004 UTC
# Line 2  package IsisDB; Line 2  package IsisDB;
2  use strict;  use strict;
3    
4  use Carp;  use Carp;
5    use File::Glob qw(:globally :nocase);
6    
7  use Data::Dumper;  use Data::Dumper;
8    
9  BEGIN {  BEGIN {
10          use Exporter ();          use Exporter ();
11          use vars qw ($VERSION @ISA @EXPORT @EXPORT_OK %EXPORT_TAGS);          use vars qw ($VERSION @ISA @EXPORT @EXPORT_OK %EXPORT_TAGS);
12          $VERSION     = 0.02;          $VERSION     = 0.08;
13          @ISA         = qw (Exporter);          @ISA         = qw (Exporter);
14          #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
15          @EXPORT      = qw ();          @EXPORT      = qw ();
# Line 18  BEGIN { Line 20  BEGIN {
20    
21  =head1 NAME  =head1 NAME
22    
23  IsisDB - Read CDS/ISIS database  IsisDB - Read CDS/ISIS, WinISIS and IsisMarc database
24    
25  =head1 SYNOPSIS  =head1 SYNOPSIS
26    
27    use IsisDB    use IsisDB;
28    
29    my $isis = new IsisDB(    my $isis = new IsisDB(
30          isisdb => './cds/cds',          isisdb => './cds/cds',
31    );    );
32    
33      for(my $mfn = 1; $mfn <= $isis->{'maxmfn'}; $mfn++) {
34            print $isis->to_ascii($mfn),"\n";
35      }
36    
37  =head1 DESCRIPTION  =head1 DESCRIPTION
38    
39  This module will read CDS/ISIS databases and create hash values out of it.  This module will read ISIS databases created by DOS CDS/ISIS, WinIsis or
40  It can be used as perl-only alternative to OpenIsis module.  IsisMarc. It can be used as perl-only alternative to OpenIsis module.
41    
42    It can create hash values from data in ISIS database (using C<to_hash>),
43    ASCII dump (using C<to_ascii>) or just hash with field names and packed
44    values (like C<^asomething^belse>).
45    
46    Unique feature of this module is ability to C<include_deleted> records.
47    It will also skip zero sized fields (OpenIsis has a bug in XS bindings, so
48    fields which are zero sized will be filled with random junk from memory).
49    
50    It also has support for identifiers (only if ISIS database is created by
51    IsisMarc), see C<to_hash>.
52    
53    This will module will always be slower than OpenIsis module which use C
54    library. However, since it's written in perl, it's platform independent (so
55    you don't need C compiler), and can be easily modified. I hope that it
56    creates data structures which are easier to use than ones created by
57    OpenIsis, so reduced time in other parts of the code should compensate for
58    slower performance of this module (speed of reading ISIS database is
59    rarely an issue).
60    
61  =head1 METHODS  =head1 METHODS
62    
# Line 50  It can be used as perl-only alternative Line 76  It can be used as perl-only alternative
76  # some binary reads  # some binary reads
77  #  #
78    
 sub Read32 {  
         my $self = shift;  
   
         my $f = shift || die "Read32 needs file handle";  
         read($$f,$b,4) || die "can't read 4 bytes from $$f from position ".tell($f);  
         return unpack("l",$b);  
 }  
   
79  =head2 new  =head2 new
80    
81  Open CDS/ISIS database  Open ISIS database
82    
83   my $isis = new IsisDB(   my $isis = new IsisDB(
84          isisdb => './cds/cds',          isisdb => './cds/cds',
85          read_fdt => 1,          read_fdt => 1,
86            include_deleted => 1,
87            hash_filter => sub {
88                    my $v = shift;
89                    $v =~ s#foo#bar#g;
90            },
91          debug => 1,          debug => 1,
92   );   );
93    
# Line 74  Options are described below: Line 97  Options are described below:
97    
98  =item isisdb  =item isisdb
99    
100  Prefix path to CDS/ISIS. It should contain full or relative path to database  This is full or relative path to ISIS database files which include
101  and common prefix of C<.FDT>, C<.MST>, C<.CNT>, C<.XRF> and C<.MST> files.  common prefix of C<.MST>, and C<.XRF> and optionally C<.FDT> (if using
102    C<read_fdt> option) files.
103    
104    In this example it uses C<./cds/cds.MST> and related files.
105    
106  =item read_fdt  =item read_fdt
107    
108  Boolean flag to specify if field definition table should be read. It's off  Boolean flag to specify if field definition table should be read. It's off
109  by default.  by default.
110    
111    =item include_deleted
112    
113    Don't skip logically deleted records in ISIS.
114    
115    =item hash_filter
116    
117    Filter code ref which will be used before data is converted to hash.
118    
119  =item debug  =item debug
120    
121  Dump a C<lot> of debugging output.  Dump a B<lot> of debugging output.
122    
123  =back  =back
124    
# Line 97  sub new { Line 131  sub new {
131          my $self = {};          my $self = {};
132          bless($self, $class);          bless($self, $class);
133    
134          $self->{isisdb} = {@_}->{isisdb} || croak "new needs database name as argument!";          croak "new needs database name (isisdb) as argument!" unless ({@_}->{isisdb});
135    
136          $self->{debug} = {@_}->{debug};          foreach my $v (qw{isisdb debug include_deleted hash_filter}) {
137                    $self->{$v} = {@_}->{$v};
138            }
139    
140            my @isis_files = grep(/\.(FDT|MST|XRF|CNT)$/i,glob($self->{isisdb}."*"));
141    
142            foreach my $f (@isis_files) {
143                    my $ext = $1 if ($f =~ m/\.(\w\w\w)$/);
144                    $self->{lc($ext)."_file"} = $f;
145            }
146    
147            my @must_exist = qw(mst xrf);
148            push @must_exist, "fdt" if ($self->{read_fdt});
149    
150            foreach my $ext (@must_exist) {
151                    croak "missing ",uc($ext)," file in ",$self->{isisdb} unless ($self->{$ext."_file"});
152            }
153    
154            print STDERR "## using files: ",join(" ",@isis_files),"\n" if ($self->{debug});
155    
156          # 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!
157          if ({@_}->{read_fdt} && -e $self->{isisdb}.".FDT") {          if ($self->{read_fdt} && -e $self->{fdt_file}) {
158    
159                  # read the $db.FDT file for tags                  # read the $db.FDT file for tags
160                  my $fieldzone=0;                  my $fieldzone=0;
161    
162                  open(fileFDT, $self->{isisdb}.".FDT") || croak "can't read '$self->{isisdb}.FDT': $!";                  open(fileFDT, $self->{fdt_file}) || croak "can't read '$self->{fdt_file}': $!";
163    
164                  while (<fileFDT>) {                  while (<fileFDT>) {
165                          chomp;                          chomp;
# Line 131  sub new { Line 183  sub new {
183    
184          # Get the Maximum MFN from $db.MST          # Get the Maximum MFN from $db.MST
185    
186          open(fileMST,$self->{isisdb}.".MST") || croak "can't read '$self->{isisdb}.MST': $!";          open($self->{'fileMST'}, $self->{mst_file}) || croak "can't open '$self->{mst_file}': $!";
187    
188          # MST format:   (* = 32 bit signed)          # MST format:   (* = 32 bit signed)
189          # CTLMFN*       always 0          # CTLMFN*       always 0
# Line 139  sub new { Line 191  sub new {
191          # NXTMFB*       last block allocated to master file          # NXTMFB*       last block allocated to master file
192          # NXTMFP        offset to next available position in last block          # NXTMFP        offset to next available position in last block
193          # MFTYPE        always 0 for user db file (1 for system)          # MFTYPE        always 0 for user db file (1 for system)
194          seek(fileMST,4,0);          seek($self->{'fileMST'},4,0);
195          $self->{'NXTMFN'}=$self->Read32(\*fileMST) || carp "NXTNFN is zero";  
196            my $buff;
197    
198            read($self->{'fileMST'}, $buff, 4);
199            $self->{'NXTMFN'}=unpack("l",$buff) || carp "NXTNFN is zero";
200    
201          # save maximum MFN          # save maximum MFN
202          $self->{'maxmfn'} = $self->{'NXTMFN'} - 1;          $self->{'maxmfn'} = $self->{'NXTMFN'} - 1;
203    
204          close(fileMST);  
205    
206    
207            print STDERR Dumper($self),"\n" if ($self->{debug});
208    
209            # open files for later
210            open($self->{'fileXRF'}, $self->{xrf_file}) || croak "can't open '$self->{xrf_file}': $!";
211    
212            $self ? return $self : return undef;
213    }
214    
215    =head2 read_cnt
216    
217    This function is not really used by module, but can be useful to find info
218    about your index (if debugging it for example).
219    
220      print Dumper($isis->read_cnt);
221    
222    =cut
223    
224    sub read_cnt  {
225            my $self = shift;
226    
227            croak "missing CNT file in ",$self->{isisdb} unless ($self->{cnt_file});
228    
229          # Get the index information from $db.CNT          # Get the index information from $db.CNT
230        
231          open(fileCNT, $self->{isisdb}.".CNT") || croak "can't read '$self->{isisdb}.CNT': $!";          open(fileCNT, $self->{cnt_file}) || croak "can't read '$self->{cnt_file}': $!";
232    
233          # There is two 26 Bytes fixed lenght records          # There is two 26 Bytes fixed lenght records
234    
# Line 173  sub new { Line 252  sub new {
252                  my $buff = shift || return;                  my $buff = shift || return;
253                  my @arr = unpack("ssssssllls", $buff);                  my @arr = unpack("ssssssllls", $buff);
254    
255                    print STDERR "unpack_cnt: ",join(" ",@arr),"\n" if ($self->{'debug'});
256    
257                  my $IDTYPE = shift @arr;                  my $IDTYPE = shift @arr;
258                  foreach (@flds) {                  foreach (@flds) {
259                          $self->{$IDTYPE}->{$_} = abs(shift @arr);                          $self->{cnt}->{$IDTYPE}->{$_} = abs(shift @arr);
260                  }                  }
261          }          }
262    
263          my $buff;          my $buff;
264    
265          read(fileCNT, $buff, 26);          read(fileCNT, $buff, 26);
266          $self->unpack_cnt($buff);          $self->unpack_cnt($buff);
267    
268          read(fileCNT, $buff, 26);          read(fileCNT, $buff, 26);
269          $self->unpack_cnt($buff);          $self->unpack_cnt($buff);
270    
   
271          close(fileCNT);          close(fileCNT);
272    
273          print Dumper($self) if ($self->{debug});          return $self->{cnt};
   
         # open files for later  
         open($self->{'fileXRF'}, $self->{isisdb}.".XRF") || croak "can't open '$self->{isisdb}.XRF': $!";  
   
         open($self->{'fileMST'}, $self->{isisdb}.".MST") || croak "can't open '$self->{isisdb}.MST': $!";  
   
         $self ? return $self : return undef;  
274  }  }
275    
276  =head2 fetch  =head2 fetch
# Line 206  Read record with selected MFN Line 280  Read record with selected MFN
280    my $rec = $isis->fetch(55);    my $rec = $isis->fetch(55);
281    
282  Returns hash with keys which are field names and values are unpacked values  Returns hash with keys which are field names and values are unpacked values
283  for that field.  for that field like this:
284    
285      $rec = {
286        '210' => [ '^aNew York^cNew York University press^dcop. 1988' ],
287        '990' => [ '2140', '88', 'HAY' ],
288      };
289    
290  =cut  =cut
291    
# Line 215  sub fetch { Line 294  sub fetch {
294    
295          my $mfn = shift || croak "fetch needs MFN as argument!";          my $mfn = shift || croak "fetch needs MFN as argument!";
296    
297          print "fetch: $mfn\n" if ($self->{debug});          # is mfn allready in memory?
298            my $old_mfn = $self->{'current_mfn'} || -1;
299            return $self->{record} if ($mfn == $old_mfn);
300    
301            print STDERR "## fetch: $mfn\n" if ($self->{debug});
302    
303          # XXX check this?          # XXX check this?
304          my $mfnpos=($mfn+int(($mfn-1)/127))*4;          my $mfnpos=($mfn+int(($mfn-1)/127))*4;
305    
306          print "seeking to $mfnpos in file '$self->{isisdb}.XRF'\n" if ($self->{debug});          print STDERR "## seeking to $mfnpos in file '$self->{xrf_file}'\n" if ($self->{debug});
307          seek($self->{'fileXRF'},$mfnpos,0);          seek($self->{'fileXRF'},$mfnpos,0);
308    
309            my $buff;
310    
311            # delete old record
312            delete $self->{record};
313    
314          # read XRFMFB abd XRFMFP          # read XRFMFB abd XRFMFP
315          my $pointer=$self->Read32(\*{$self->{'fileXRF'}});          read($self->{'fileXRF'}, $buff, 4);
316            my $pointer=unpack("l",$buff) || carp "pointer is null";
317    
318            # check for logically deleted record
319            if ($pointer < 0) {
320                    print STDERR "## record $mfn is logically deleted\n" if ($self->{debug});
321                    $self->{deleted} = $mfn;
322    
323                    return unless $self->{include_deleted};
324    
325                    $pointer = abs($pointer);
326            }
327    
328          my $XRFMFB = int($pointer/2048);          my $XRFMFB = int($pointer/2048);
329          my $XRFMFP = $pointer - ($XRFMFB*2048);          my $XRFMFP = $pointer - ($XRFMFB*2048);
330    
331          print "XRFMFB: $XRFMFB XRFMFP: $XRFMFP\n" if ($self->{debug});          # (XRFMFB - 1) * 512 + XRFMFP
332            # why do i have to do XRFMFP % 1024 ?
333    
334          # XXX fix this to be more readable!!          my $blk_off = (($XRFMFB - 1) * 512) + ($XRFMFP % 512);
         # e.g. (XRFMFB - 1) * 512 + XRFMFP  
335    
336          my $offset = $pointer;          print STDERR "## pointer: $pointer XRFMFB: $XRFMFB XRFMFP: $XRFMFP offset: $blk_off\n" if ($self->{'debug'});
         my $offset2=int($offset/2048)-1;  
         my $offset22=int($offset/4096);  
         my $offset3=$offset-($offset22*4096);  
         if ($offset3>512) {  
                 $offset3=$offset3-2048;  
         }  
         my $offset4=($offset2*512)+$offset3;  
   
         print "$offset - $offset2 - $offset3 - $offset4\n" if ($self->{debug});  
337    
338          # Get Record Information          # Get Record Information
339    
340          seek($self->{'fileMST'},$offset4,0);          seek($self->{'fileMST'},$blk_off,0);
341    
342            read($self->{'fileMST'}, $buff, 4);
343            my $value=unpack("l",$buff);
344    
345          my $value=$self->Read32(\*{$self->{'fileMST'}});          print STDERR "## offset for rowid $value is $blk_off (blk $XRFMFB off $XRFMFP)\n" if ($self->{debug});
346    
347          if ($value!=$mfn) {          if ($value!=$mfn) {
348  print ("Error: The MFN:".$mfn." is not found in MST(".$value.")");                      if ($value == 0) {
349                  return -1;      # XXX deleted record?                          print STDERR "## record $mfn is physically deleted\n" if ($self->{debug});
350          }                          $self->{deleted} = $mfn;
351                            return;
352                    }
353    
354  #       $MFRL=$self->Read16($fileMST);                  carp "Error: MFN ".$mfn." not found in MST file, found $value";    
355  #       $MFBWB=$self->Read32($fileMST);                  return;
356  #       $MFBWP=$self->Read16($fileMST);          }
 #       $BASE=$self->Read16($fileMST);  
 #       $NVF=$self->Read16($fileMST);  
 #       $STATUS=$self->Read16($fileMST);  
357    
         my $buff;  
358          read($self->{'fileMST'}, $buff, 14);          read($self->{'fileMST'}, $buff, 14);
359    
360          my ($MFRL,$MFBWB,$MFBWP,$BASE,$NVF,$STATUS) = unpack("slssss", $buff);          my ($MFRL,$MFBWB,$MFBWP,$BASE,$NVF,$STATUS) = unpack("slssss", $buff);
361    
362          print "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});
363    
364            warn "MFRL $MFRL is not even number" unless ($MFRL % 2 == 0);
365    
366            warn "BASE is not 18+6*NVF" unless ($BASE == 18 + 6 * $NVF);
367    
368          # Get Directory Format          # Get Directory Format
369    
# Line 278  print ("Error: The MFN:".$mfn." is not f Line 373  print ("Error: The MFN:".$mfn." is not f
373    
374          read($self->{'fileMST'}, $buff, 6 * $NVF);          read($self->{'fileMST'}, $buff, 6 * $NVF);
375    
376          my $fld_len = 0;          my $rec_len = 0;
377    
378          for (my $i = 0 ; $i < $NVF ; $i++) {          for (my $i = 0 ; $i < $NVF ; $i++) {
379    
 #               $TAG=$self->Read16($fileMST);  
 #               $POS=$self->Read16($fileMST);  
 #               $LEN=$self->Read16($fileMST);  
   
380                  my ($TAG,$POS,$LEN) = unpack("sss", substr($buff,$i * 6, 6));                  my ($TAG,$POS,$LEN) = unpack("sss", substr($buff,$i * 6, 6));
381    
382                  print "TAG: $TAG POS: $POS LEN: $LEN\n" if ($self->{debug});                  print STDERR "## TAG: $TAG POS: $POS LEN: $LEN\n" if ($self->{debug});
383    
384                  # The TAG does not exists in .FDT so we set it to 0.                  # The TAG does not exists in .FDT so we set it to 0.
385                  #                  #
# Line 304  print ("Error: The MFN:".$mfn." is not f Line 395  print ("Error: The MFN:".$mfn." is not f
395                  push @FieldPOS,$POS;                  push @FieldPOS,$POS;
396                  push @FieldLEN,$LEN;                  push @FieldLEN,$LEN;
397    
398                  $fld_len += $LEN;                  $rec_len += $LEN;
399          }          }
400    
401          # Get Variable Fields          # Get Variable Fields
402    
403          delete $self->{record};          read($self->{'fileMST'},$buff,$rec_len);
404    
405          read($self->{'fileMST'},$buff,$fld_len);          print STDERR "## rec_len: $rec_len poc: ",tell($self->{'fileMST'})."\n" if ($self->{debug});
406    
407          for (my $i = 0 ; $i < $NVF ; $i++) {          for (my $i = 0 ; $i < $NVF ; $i++) {
408                    # skip zero-sized fields
409                    next if ($FieldLEN[$i] == 0);
410    
411                  push @{$self->{record}->{$FieldTAG[$i]}}, substr($buff,$FieldPOS[$i],$FieldLEN[$i]);                  push @{$self->{record}->{$FieldTAG[$i]}}, substr($buff,$FieldPOS[$i],$FieldLEN[$i]);
412          }          }
         close(fileMST);  
413    
414          # The record is marked for deletion          $self->{'current_mfn'} = $mfn;
         if ($STATUS==1) {  
                 return -1;  
         }  
415    
416          print Dumper($self) if ($self->{debug});          print STDERR Dumper($self),"\n" if ($self->{debug});
417    
418          return $self->{'record'};          return $self->{'record'};
419  }  }
420    
421  =head2 to_ascii  =head2 to_ascii
422    
423  Dump ascii output of selected MFN  Dump ASCII output of record with specified MFN
424    
425      print $isis->to_ascii(42);
426    
427    print $isis->to_ascii(55);  It outputs something like this:
428    
429      210   ^aNew York^cNew York University press^dcop. 1988
430      990   2140
431      990   88
432      990   HAY
433    
434    If C<read_fdt> is specified when calling C<new> it will display field names
435    from C<.FDT> file instead of numeric tags.
436    
437  =cut  =cut
438    
# Line 346  sub to_ascii { Line 446  sub to_ascii {
446          my $out = "0\t$mfn";          my $out = "0\t$mfn";
447    
448          foreach my $f (sort keys %{$rec}) {          foreach my $f (sort keys %{$rec}) {
449                  $out .= "\n$f\t".join("\n$f\t",@{$self->{record}->{$f}});                  my $fn = $self->tag_name($f);
450                    $out .= "\n$fn\t".join("\n$fn\t",@{$self->{record}->{$f}});
451          }          }
452    
453          $out .= "\n";          $out .= "\n";
# Line 354  sub to_ascii { Line 455  sub to_ascii {
455          return $out;          return $out;
456  }  }
457    
458  #  =head2 to_hash
 # XXX porting from php left-over:  
 #  
 # do I *REALLY* need those methods, or should I use  
 # $self->{something} directly?  
 #  
 # Probably direct usage is better!  
 #  
459    
460  sub TagName {  Read record with specified MFN and convert it to hash
461    
462      my $hash = $isis->to_hash($mfn);
463    
464    It has ability to convert characters (using C<hash_filter> from ISIS
465    database before creating structures enabling character re-mapping or quick
466    fix-up of data.
467    
468    This function returns hash which is like this:
469    
470      $hash = {
471        '210' => [
472                   {
473                     'c' => 'New York University press',
474                     'a' => 'New York',
475                     'd' => 'cop. 1988'
476                   }
477                 ],
478        '990' => [
479                   '2140',
480                   '88',
481                   'HAY'
482                 ],
483      };
484    
485    You can later use that hash to produce any output from ISIS data.
486    
487    If database is created using IsisMarc, it will also have to special fields
488    which will be used for identifiers, C<i1> and C<i2> like this:
489    
490      '200' => [
491                 {
492                   'i1' => '1',
493                   'i2' => ' '
494                   'a' => 'Goa',
495                   'f' => 'Valdo D\'Arienzo',
496                   'e' => 'tipografie e tipografi nel XVI secolo',
497                 }
498               ],
499    
500    This method will also create additional field C<000> with MFN.
501    
502    =cut
503    
504    sub to_hash {
505          my $self = shift;          my $self = shift;
506          return $self->{TagName};  
507            my $mfn = shift || confess "need mfn!";
508    
509            # init record to include MFN as field 000
510            my $rec = { '000' => [ $mfn ] };
511    
512            my $row = $self->fetch($mfn);
513    
514            foreach my $k (keys %{$row}) {
515                    foreach my $l (@{$row->{$k}}) {
516    
517                            # filter output
518                            $l = $self->{'hash_filter'}->($l) if ($self->{'hash_filter'});
519    
520                            my $val;
521    
522                            # has identifiers?
523                            ($val->{'i1'},$val->{'i2'}) = ($1,$2) if ($l =~ s/^([01 #])([01 #])\^/\^/);
524    
525                            # has subfields?
526                            if ($l =~ m/\^/) {
527                                    foreach my $t (split(/\^/,$l)) {
528                                            next if (! $t);
529                                            $val->{substr($t,0,1)} = substr($t,1);
530                                    }
531                            } else {
532                                    $val = $l;
533                            }
534    
535                            push @{$rec->{$k}}, $val;
536                    }
537            }
538    
539            return $rec;
540  }  }
541    
542  sub NextMFN {  =head2 tag_name
543    
544    Return name of selected tag
545    
546     print $isis->tag_name('200');
547    
548    =cut
549    
550    sub tag_name {
551          my $self = shift;          my $self = shift;
552          return $self->{NXTMFN};          my $tag = shift || return;
553            return $self->{'TagName'}->{$tag} || $tag;
554  }  }
555    
556  1;  1;
# Line 386  This module has been very lightly tested Line 566  This module has been very lightly tested
566          dpavlin@rot13.org          dpavlin@rot13.org
567          http://www.rot13.org/~dpavlin/          http://www.rot13.org/~dpavlin/
568    
569  This module is based heavily on code from LIBISIS.PHP - Library to read ISIS files V0.1.1  This module is based heavily on code from C<LIBISIS.PHP> library to read ISIS files V0.1.1
570  written in php and (c) 2000 Franck Martin - <franck@sopac.org> released under LGPL.  written in php and (c) 2000 Franck Martin <franck@sopac.org> and released under LGPL.
571    
572  =head1 COPYRIGHT  =head1 COPYRIGHT
573    
# Line 400  LICENSE file included with this module. Line 580  LICENSE file included with this module.
580    
581  =head1 SEE ALSO  =head1 SEE ALSO
582    
583  L<http://www.openisis.org|OpenIsis>, perl(1).  OpenIsis web site L<http://www.openisis.org>
584    
585    perl4lib site L<http://perl4lib.perl.org>
586    
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