/[Biblio-Isis]/trunk/lib/Biblio/Isis.pm
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trunk/IsisDB.pm revision 23 by dpavlin, Fri Dec 31 04:21:21 2004 UTC trunk/lib/Biblio/Isis.pm revision 56 by dpavlin, Sat Jul 8 16:03:52 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     = 0.07;          $VERSION     = 0.20;
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    
31    for(my $mfn = 1; $mfn <= $isis->{'maxmfn'}; $mfn++) {    for(my $mfn = 1; $mfn <= $isis->count; $mfn++) {
32          print $isis->to_ascii($mfn),"\n";          print $isis->to_ascii($mfn),"\n";
33    }    }
34    
35  =head1 DESCRIPTION  =head1 DESCRIPTION
36    
37  This module will read ISIS databases created by DOS CDS/ISIS, WinIsis or  This module will read ISIS databases created by DOS CDS/ISIS, WinIsis or
38  IsisMarc. It can be used as perl-only alternative to OpenIsis module.  IsisMarc. It can be used as perl-only alternative to OpenIsis module which
39    seems to depriciate it's old C<XS> bindings for perl.
40    
41  It can create hash values from data in ISIS database (using C<to_hash>),  It can create hash values from data in ISIS database (using C<to_hash>),
42  ASCII dump (using C<to_ascii>) or just hash with field names and packed  ASCII dump (using C<to_ascii>) or just hash with field names and packed
# Line 50  fields which are zero sized will be fill Line 49  fields which are zero sized will be fill
49  It also has support for identifiers (only if ISIS database is created by  It also has support for identifiers (only if ISIS database is created by
50  IsisMarc), see C<to_hash>.  IsisMarc), see C<to_hash>.
51    
52  This will module will always be slower than OpenIsis module which use C  This module will always be slower than OpenIsis module which use C
53  library. However, since it's written in perl, it's platform independent (so  library. However, since it's written in perl, it's platform independent (so
54  you don't need C compiler), and can be easily modified. I hope that it  you don't need C compiler), and can be easily modified. I hope that it
55  creates data structures which are easier to use than ones created by  creates data structures which are easier to use than ones created by
# Line 80  rarely an issue). Line 79  rarely an issue).
79    
80  Open ISIS database  Open ISIS database
81    
82   my $isis = new IsisDB(   my $isis = new Biblio::Isis(
83          isisdb => './cds/cds',          isisdb => './cds/cds',
84          read_fdt => 1,          read_fdt => 1,
85          include_deleted => 1,          include_deleted => 1,
# Line 118  Filter code ref which will be used befor Line 117  Filter code ref which will be used befor
117    
118  =item debug  =item debug
119    
120  Dump a B<lot> of debugging output.  Dump a B<lot> of debugging output even at level 1. For even more increase level.
121    
122  =back  =back
123    
 It will also set C<$isis-E<gt>{'maxmfn'}> which is maximum MFN stored in database.  
   
124  =cut  =cut
125    
126  sub new {  sub new {
# Line 148  sub new { Line 145  sub new {
145          push @must_exist, "fdt" if ($self->{read_fdt});          push @must_exist, "fdt" if ($self->{read_fdt});
146    
147          foreach my $ext (@must_exist) {          foreach my $ext (@must_exist) {
148                  croak "missing ",uc($ext)," file in ",$self->{isisdb} unless ($self->{$ext."_file"});                  unless ($self->{$ext."_file"}) {
149                            carp "missing ",uc($ext)," file in ",$self->{isisdb};
150                            return;
151                    }
152          }          }
153    
154          print STDERR "## using files: ",join(" ",@isis_files),"\n" if ($self->{debug});          if ($self->{debug}) {
155                    print STDERR "## using files: ",join(" ",@isis_files),"\n";
156                    eval "use Data::Dump";
157    
158                    if (! $@) {
159                            *Dumper = *Data::Dump::dump;
160                    } else {
161                            use Data::Dumper;
162                    }
163            }
164    
165          # if you want to read .FDT file use read_fdt argument when creating class!          # if you want to read .FDT file use read_fdt argument when creating class!
166          if ($self->{read_fdt} && -e $self->{fdt_file}) {          if ($self->{read_fdt} && -e $self->{fdt_file}) {
# Line 159  sub new { Line 168  sub new {
168                  # read the $db.FDT file for tags                  # read the $db.FDT file for tags
169                  my $fieldzone=0;                  my $fieldzone=0;
170    
171                  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}': $!";
172                    binmode($fileFDT);
173    
174                  while (<fileFDT>) {                  while (<$fileFDT>) {
175                          chomp;                          chomp;
176                          if ($fieldzone) {                          if ($fieldzone) {
177                                  my $name=substr($_,0,30);                                  my $name=substr($_,0,30);
# Line 178  sub new { Line 188  sub new {
188                          }                          }
189                  }                  }
190                                    
191                  close(fileFDT);                  close($fileFDT);
192          }          }
193    
194          # Get the Maximum MFN from $db.MST          # Get the Maximum MFN from $db.MST
195    
196          open($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}': $!";
197            binmode($self->{'fileMST'});
198    
199          # MST format:   (* = 32 bit signed)          # MST format:   (* = 32 bit signed)
200          # CTLMFN*       always 0          # CTLMFN*       always 0
# Line 191  sub new { Line 202  sub new {
202          # NXTMFB*       last block allocated to master file          # NXTMFB*       last block allocated to master file
203          # NXTMFP        offset to next available position in last block          # NXTMFP        offset to next available position in last block
204          # MFTYPE        always 0 for user db file (1 for system)          # MFTYPE        always 0 for user db file (1 for system)
205          seek($self->{'fileMST'},4,0);          seek($self->{'fileMST'},4,0) || croak "can't seek to offset 0 in MST: $!";
206    
207          my $buff;          my $buff;
208    
209          read($self->{'fileMST'}, $buff, 4);          read($self->{'fileMST'}, $buff, 4) || croak "can't read NXTMFN from MST: $!";
210          $self->{'NXTMFN'}=unpack("l",$buff) || carp "NXTNFN is zero";          $self->{'NXTMFN'}=unpack("V",$buff) || croak "NXTNFN is zero";
   
         # save maximum MFN  
         $self->{'maxmfn'} = $self->{'NXTMFN'} - 1;  
   
   
211    
212            print STDERR "## self ",Dumper($self),"\n" if ($self->{debug});
         print STDERR Dumper($self),"\n" if ($self->{debug});  
213    
214          # open files for later          # open files for later
215          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}': $!";
216            binmode($self->{'fileXRF'});
217    
218          $self ? return $self : return undef;          $self ? return $self : return undef;
219  }  }
220    
221  =head2 read_cnt  =head2 count
222    
223  This function is not really used by module, but can be useful to find info  Return number of records in database
 about your index (if debugging it for example).  
224    
225    print Dumper($isis->read_cnt);    print $isis->count;
226    
227  =cut  =cut
228    
229  sub read_cnt  {  sub count {
230          my $self = shift;          my $self = shift;
231            return $self->{'NXTMFN'} - 1;
         croak "missing CNT file in ",$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}': $!";  
   
         # There is two 26 Bytes fixed lenght records  
   
         #  0: IDTYPE    BTree type                              16  
         #  2: ORDN      Nodes Order                             16  
         #  4: ORDF      Leafs Order                             16  
         #  6: N         Number of Memory buffers for nodes      16  
         #  8: K         Number of buffers for first level index 16  
         # 10: LIV       Current number of Index Levels          16  
         # 12: POSRX*    Pointer to Root Record in N0x           32  
         # 16: NMAXPOS*  Next Available position in N0x          32  
         # 20: FMAXPOS*  Next available position in L0x          32  
         # 24: ABNORMAL  Formal BTree normality indicator        16  
         # length: 26 bytes  
   
         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);  
                 }  
         }  
   
         my $buff;  
   
         read(fileCNT, $buff, 26);  
         $self->unpack_cnt($buff);  
   
         read(fileCNT, $buff, 26);  
         $self->unpack_cnt($buff);  
   
         close(fileCNT);  
   
         return $self->{cnt};  
232  }  }
233    
234  =head2 fetch  =head2 fetch
# Line 296  sub fetch { Line 254  sub fetch {
254    
255          # is mfn allready in memory?          # is mfn allready in memory?
256          my $old_mfn = $self->{'current_mfn'} || -1;          my $old_mfn = $self->{'current_mfn'} || -1;
257          return if ($mfn == $old_mfn);          return $self->{record} if ($mfn == $old_mfn);
258    
259          print STDERR "## fetch: $mfn\n" if ($self->{debug});          print STDERR "## fetch: $mfn\n" if ($self->{debug});
260    
# Line 308  sub fetch { Line 266  sub fetch {
266    
267          my $buff;          my $buff;
268    
269            # delete old record
270            delete $self->{record};
271    
272          # read XRFMFB abd XRFMFP          # read XRFMFB abd XRFMFP
273          read($self->{'fileXRF'}, $buff, 4);          read($self->{'fileXRF'}, $buff, 4);
274          my $pointer=unpack("l",$buff) || carp "pointer is null";          my $pointer=unpack("V",$buff);
275            if (! $pointer) {
276                    if ($self->{include_deleted}) {
277                            return;
278                    } else {
279                            warn "pointer for MFN $mfn is null\n";
280                            return;
281                    }
282            }
283    
284            # check for logically deleted record
285            if ($pointer & 0x80000000) {
286                    print STDERR "## record $mfn is logically deleted\n" if ($self->{debug});
287                    $self->{deleted} = $mfn;
288    
289                    return unless $self->{include_deleted};
290    
291                    # abs
292                    $pointer = ($pointer ^ 0xffffffff) + 1;
293            }
294    
295          my $XRFMFB = int($pointer/2048);          my $XRFMFB = int($pointer/2048);
296          my $XRFMFP = $pointer - ($XRFMFB*2048);          my $XRFMFP = $pointer - ($XRFMFB*2048);
297    
   
298          # (XRFMFB - 1) * 512 + XRFMFP          # (XRFMFB - 1) * 512 + XRFMFP
299          # why do i have to do XRFMFP % 1024 ?          # why do i have to do XRFMFP % 1024 ?
300    
301          my $blk_off = (($XRFMFB - 1) * 512) + ($XRFMFP % 1024);          my $blk_off = (($XRFMFB - 1) * 512) + ($XRFMFP % 512);
302    
303          print STDERR "## pointer: $pointer XRFMFB: $XRFMFB XRFMFP: $XRFMFP offset: $blk_off\n" if ($self->{'debug'});          print STDERR "## pointer: $pointer XRFMFB: $XRFMFB XRFMFP: $XRFMFP offset: $blk_off\n" if ($self->{'debug'});
304    
305          # Get Record Information          # Get Record Information
306    
307          seek($self->{'fileMST'},$blk_off,0);          seek($self->{'fileMST'},$blk_off,0) || croak "can't seek to $blk_off: $!";
308    
309          read($self->{'fileMST'}, $buff, 4);          read($self->{'fileMST'}, $buff, 4) || croak "can't read 4 bytes at offset $blk_off from MST file: $!";
310          my $value=unpack("l",$buff);          my $value=unpack("V",$buff);
311    
312          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});
313    
314          if ($value!=$mfn) {          if ($value!=$mfn) {
315                  carp "Error: MFN ".$mfn." not found in MST(".$value.")";                      if ($value == 0) {
316                  #return;                # XXX deleted record?                          print STDERR "## record $mfn is physically deleted\n" if ($self->{debug});
317          }                          $self->{deleted} = $mfn;
318                            return;
319                    }
320    
321  #       $MFRL=$self->Read16($fileMST);                  carp "Error: MFN ".$mfn." not found in MST file, found $value";    
322  #       $MFBWB=$self->Read32($fileMST);                  return;
323  #       $MFBWP=$self->Read16($fileMST);          }
 #       $BASE=$self->Read16($fileMST);  
 #       $NVF=$self->Read16($fileMST);  
 #       $STATUS=$self->Read16($fileMST);  
324    
325          read($self->{'fileMST'}, $buff, 14);          read($self->{'fileMST'}, $buff, 14);
326    
327          my ($MFRL,$MFBWB,$MFBWP,$BASE,$NVF,$STATUS) = unpack("slssss", $buff);          my ($MFRL,$MFBWB,$MFBWP,$BASE,$NVF,$STATUS) = unpack("vVvvvv", $buff);
328    
329          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});
330    
331          # delete old record          warn "MFRL $MFRL is not even number" unless ($MFRL % 2 == 0);
         delete $self->{record};  
   
         ## FIXME this is a bug  
         if (! $self->{'include_deleted'} && $MFRL < 0) {  
                 print "## logically deleted record $mfn, skipping...\n" if ($self->{debug});  
                 return;  
         }  
332    
333          warn "BASE is not 18+6*NVF" unless ($BASE == 18 + 6 * $NVF);          warn "BASE is not 18+6*NVF" unless ($BASE == 18 + 6 * $NVF);
334    
# Line 373  sub fetch { Line 344  sub fetch {
344    
345          for (my $i = 0 ; $i < $NVF ; $i++) {          for (my $i = 0 ; $i < $NVF ; $i++) {
346    
347  #               $TAG=$self->Read16($fileMST);                  my ($TAG,$POS,$LEN) = unpack("vvv", substr($buff,$i * 6, 6));
 #               $POS=$self->Read16($fileMST);  
 #               $LEN=$self->Read16($fileMST);  
   
                 my ($TAG,$POS,$LEN) = unpack("sss", substr($buff,$i * 6, 6));  
348    
349                  print STDERR "## TAG: $TAG POS: $POS LEN: $LEN\n" if ($self->{debug});                  print STDERR "## TAG: $TAG POS: $POS LEN: $LEN\n" if ($self->{debug});
350    
# Line 413  sub fetch { Line 380  sub fetch {
380    
381          $self->{'current_mfn'} = $mfn;          $self->{'current_mfn'} = $mfn;
382    
383          print Dumper($self),"\n" if ($self->{debug});          print STDERR Dumper($self),"\n" if ($self->{debug});
384    
385          return $self->{'record'};          return $self->{'record'};
386  }  }
387    
388    =head2 mfn
389    
390    Returns current MFN position
391    
392      my $mfn = $isis->mfn;
393    
394    =cut
395    
396    # This function should be simple return $self->{current_mfn},
397    # but if new is called with _hack_mfn it becomes setter.
398    # It's useful in tests when setting $isis->{record} directly
399    
400    sub mfn {
401            my $self = shift;
402            return $self->{current_mfn};
403    };
404    
405    
406  =head2 to_ascii  =head2 to_ascii
407    
408  Dump ASCII output of record with specified MFN  Returns ASCII output of record with specified MFN
409    
410    print $isis->to_ascii(42);    print $isis->to_ascii(42);
411    
412  It outputs something like this:  This outputs something like this:
413    
414    210   ^aNew York^cNew York University press^dcop. 1988    210   ^aNew York^cNew York University press^dcop. 1988
415    990   2140    990   2140
# Line 441  sub to_ascii { Line 426  sub to_ascii {
426    
427          my $mfn = shift || croak "need MFN";          my $mfn = shift || croak "need MFN";
428    
429          my $rec = $self->fetch($mfn);          my $rec = $self->fetch($mfn) || return;
430    
431          my $out = "0\t$mfn";          my $out = "0\t$mfn";
432    
# Line 461  Read record with specified MFN and conve Line 446  Read record with specified MFN and conve
446    
447    my $hash = $isis->to_hash($mfn);    my $hash = $isis->to_hash($mfn);
448    
449  It has ability to convert characters (using C<hash_filter> from ISIS  It has ability to convert characters (using C<hash_filter>) from ISIS
450  database before creating structures enabling character re-mapping or quick  database before creating structures enabling character re-mapping or quick
451  fix-up of data.  fix-up of data.
452    
# Line 497  which will be used for identifiers, C<i1 Line 482  which will be used for identifiers, C<i1
482               }               }
483             ],             ],
484    
485    In case there are repeatable subfields in record, this will create
486    following structure:
487    
488      '900' => [ {
489            'a' => [ 'foo', 'bar', 'baz' ],
490      }]
491    
492  This method will also create additional field C<000> with MFN.  This method will also create additional field C<000> with MFN.
493    
494    There is also more elaborative way to call C<to_hash> like this:
495    
496      my $hash = $isis->to_hash({
497            mfn => 42,
498            include_empty_subfields => 1,
499      });
500    
501  =cut  =cut
502    
503  sub to_hash {  sub to_hash {
504          my $self = shift;          my $self = shift;
505    
506    
507          my $mfn = shift || confess "need mfn!";          my $mfn = shift || confess "need mfn!";
508            my $arg;
509    
510            if (ref($mfn) eq 'HASH') {
511                    $arg = $mfn;
512                    $mfn = $arg->{mfn} || confess "need mfn in arguments";
513            }
514    
515          # init record to include MFN as field 000          # init record to include MFN as field 000
516          my $rec = { '000' => [ $mfn ] };          my $rec = { '000' => [ $mfn ] };
517    
518          my $row = $self->fetch($mfn);          my $row = $self->fetch($mfn) || return;
519    
520          foreach my $k (keys %{$row}) {          foreach my $k (keys %{$row}) {
521                  foreach my $l (@{$row->{$k}}) {                  foreach my $l (@{$row->{$k}}) {
522    
523                          # filter output                          # filter output
524                          $l = $self->{'hash_filter'}->($l) if ($self->{'hash_filter'});                          if ($self->{'hash_filter'}) {
525                                    $l = $self->{'hash_filter'}->($l);
526                                    next unless defined($l);
527                            }
528    
529                          my $val;                          my $val;
530    
# Line 526  sub to_hash { Line 535  sub to_hash {
535                          if ($l =~ m/\^/) {                          if ($l =~ m/\^/) {
536                                  foreach my $t (split(/\^/,$l)) {                                  foreach my $t (split(/\^/,$l)) {
537                                          next if (! $t);                                          next if (! $t);
538                                          $val->{substr($t,0,1)} = substr($t,1);                                          my ($sf,$v) = (substr($t,0,1), substr($t,1));
539                                            # FIXME make this option !
540                                            next unless ($v);
541    #                                       warn "### $k^$sf:$v",$/ if ($self->{debug} > 1);
542    
543                                            # FIXME array return optional, by default unroll to ' ; '
544                                            if (ref( $val->{$sf} ) eq 'ARRAY') {
545    
546                                                    push @{ $val->{$sf} }, $v;
547                                            } elsif (defined( $val->{$sf} )) {
548                                                    # convert scalar field to array
549                                                    $val->{$sf} = [ $val->{$sf}, $v ];
550                                            } else {
551                                                    $val->{$sf} = $v;
552                                            }
553                                  }                                  }
554                          } else {                          } else {
555                                  $val = $l;                                  $val = $l;
# Line 553  sub tag_name { Line 576  sub tag_name {
576          return $self->{'TagName'}->{$tag} || $tag;          return $self->{'TagName'}->{$tag} || $tag;
577  }  }
578    
579    
580    =head2 read_cnt
581    
582    Read content of C<.CNT> file and return hash containing it.
583    
584      print Dumper($isis->read_cnt);
585    
586    This function is not used by module (C<.CNT> files are not required for this
587    module to work), but it can be useful to examine your index (while debugging
588    for example).
589    
590    =cut
591    
592    sub read_cnt  {
593            my $self = shift;
594    
595            croak "missing CNT file in ",$self->{isisdb} unless ($self->{cnt_file});
596    
597            # Get the index information from $db.CNT
598      
599            open(my $fileCNT, $self->{cnt_file}) || croak "can't read '$self->{cnt_file}': $!";
600            binmode($fileCNT);
601    
602            my $buff;
603    
604            read($fileCNT, $buff, 26) || croak "can't read first table from CNT: $!";
605            $self->unpack_cnt($buff);
606    
607            read($fileCNT, $buff, 26) || croak "can't read second table from CNT: $!";
608            $self->unpack_cnt($buff);
609    
610            close($fileCNT);
611    
612            return $self->{cnt};
613    }
614    
615    =head2 unpack_cnt
616    
617    Unpack one of two 26 bytes fixed length record in C<.CNT> file.
618    
619    Here is definition of record:
620    
621     off key        description                             size
622      0: IDTYPE     BTree type                              s
623      2: ORDN       Nodes Order                             s
624      4: ORDF       Leafs Order                             s
625      6: N          Number of Memory buffers for nodes      s
626      8: K          Number of buffers for first level index s
627     10: LIV        Current number of Index Levels          s
628     12: POSRX      Pointer to Root Record in N0x           l
629     16: NMAXPOS    Next Available position in N0x          l
630     20: FMAXPOS    Next available position in L0x          l
631     24: ABNORMAL   Formal BTree normality indicator        s
632     length: 26 bytes
633    
634    This will fill C<$self> object under C<cnt> with hash. It's used by C<read_cnt>.
635    
636    =cut
637    
638    sub unpack_cnt {
639            my $self = shift;
640    
641            my @flds = qw(ORDN ORDF N K LIV POSRX NMAXPOS FMAXPOS ABNORMAL);
642    
643            my $buff = shift || return;
644            my @arr = unpack("vvvvvvVVVv", $buff);
645    
646            print STDERR "unpack_cnt: ",join(" ",@arr),"\n" if ($self->{'debug'});
647    
648            my $IDTYPE = shift @arr;
649            foreach (@flds) {
650                    $self->{cnt}->{$IDTYPE}->{$_} = abs(shift @arr);
651            }
652    }
653    
654  1;  1;
655    
656  =head1 BUGS  =head1 BUGS
657    
658  This module has been very lightly tested. Use with caution and report bugs.  Some parts of CDS/ISIS documentation are not detailed enough to exmplain
659    some variations in input databases which has been tested with this module.
660    When I was in doubt, I assumed that OpenIsis's implementation was right
661    (except for obvious bugs).
662    
663    However, every effort has been made to test this module with as much
664    databases (and programs that create them) as possible.
665    
666    I would be very greatful for success or failure reports about usage of this
667    module with databases from programs other than WinIsis and IsisMarc. I had
668    tested this against ouput of one C<isis.dll>-based application, but I don't
669    know any details about it's version.
670    
671    =head1 VERSIONS
672    
673    You can find version dependencies documented here
674    
675    =over 8
676    
677    =item 0.20
678    
679    Added C<< $isis->mfn >>, support for repeatable subfields and
680    C<< $isis->to_hash({ mfn => 42, ... }) >> calling convention
681    
682    =back
683    
684  =head1 AUTHOR  =head1 AUTHOR
685    
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