/[cvs]/nfo/perl/libs/Data/Storage.pm
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revision 1.6 by joko, Sat Nov 9 01:04:58 2002 UTC revision 1.13 by joko, Tue Dec 17 21:54:12 2002 UTC
# Line 4  Line 4 
4  #  #
5  # See COPYRIGHT section in pod text below for usage and distribution rights.  # See COPYRIGHT section in pod text below for usage and distribution rights.
6  #  #
7  #################################  ############################################
8  #  #
9  #  $Log$  #  $Log$
10    #  Revision 1.13  2002/12/17 21:54:12  joko
11    #  + feature when using Tangram:
12    #    + what? each object created should delivered with a globally(!?) unique identifier (GUID) besides the native tangram object id (OID)
13    #        + patched Tangram::Storage (jonen)
14    #        + enhanced Data::Storage::Schema::Tangram (joko)
15    #        + enhanced Data::Storage::Handler::Tangram 'sub getObjectByGuid' (jonen)
16    #    + how?
17    #        + each concrete (non-abstract) class gets injected with an additional field/property called 'guid' - this is done (dynamically) on schema level
18    #        + this property ('guid') gets filled on object creation/insertion from 'sub Tangram::Storage::_insert' using Data::UUID from CPAN
19    #        + (as for now) this property can get accessed by calling 'getObjectByGuid' on the already known storage-handle used throughout the application
20    #
21    #  Revision 1.12  2002/12/12 02:50:15  joko
22    #  + this now (unfortunately) needs DBI for some helper functions
23    #  + TODO: these have to be refactored to another scope! (soon!)
24    #
25    #  Revision 1.11  2002/12/11 06:53:19  joko
26    #  + updated pod
27    #
28    #  Revision 1.10  2002/12/07 03:37:23  joko
29    #  + updated pod
30    #
31    #  Revision 1.9  2002/12/01 22:15:45  joko
32    #  - sub createDb: moved to handler
33    #
34    #  Revision 1.8  2002/11/29 04:48:23  joko
35    #  + updated pod
36    #
37    #  Revision 1.7  2002/11/17 06:07:18  joko
38    #  + creating the handler is easier than proposed first - for now :-)
39    #  + sub testAvailability
40    #
41  #  Revision 1.6  2002/11/09 01:04:58  joko  #  Revision 1.6  2002/11/09 01:04:58  joko
42  #  + updated pod  #  + updated pod
43  #  #
# Line 30  Line 61 
61  #  Revision 1.1  2002/10/10 03:43:12  cvsjoko  #  Revision 1.1  2002/10/10 03:43:12  cvsjoko
62  #  + new  #  + new
63  #  #
64  #################################  ############################################
65    
 # aim_V1: should encapsulate Tangram, DBI, DBD::CSV and LWP:: to access them in an unordinary way ;)  
 # aim_V2: introduce a generic layered structure, refactor *SUBLAYER*-stuff, make (e.g.) this possible:  
 #               - Perl Data::Storage[DBD::CSV]  ->  Perl LWP::  ->  Internet HTTP/FTP/*  ->  Host Daemon  ->  csv-file  
66    
67  BEGIN {  BEGIN {
68  $Data::Storage::VERSION = 0.01;    $Data::Storage::VERSION = 0.02;
69  }  }
70    
71    
72  =head1 NAME  =head1 NAME
73    
74  Data::Storage - Interface for accessing various Storage implementations for Perl in an independent way    Data::Storage - Interface for accessing various Storage implementations for Perl in an independent way
75    
76    
77    =head1 AIMS
78    
79      - should encapsulate Tangram, DBI, DBD::CSV and LWP:: to access them in an unordinary (more convenient) way ;)
80      - introduce a generic layered structure, refactor *SUBLAYER*-stuff, make (e.g.) this possible:
81        Perl Data::Storage[DBD::CSV]  ->  Perl LWP::  ->  Internet HTTP/FTP/*  ->  Host Daemon  ->  csv-file
82      - provide generic synchronization mechanisms across arbitrary/multiple storages based on ident/checksum
83        maybe it's possible to have schema-, structural- and semantical modifications synchronized???
84    
85    
86  =head1 SYNOPSIS  =head1 SYNOPSIS
87    
88    ... the basic way:  =head2 BASIC ACCESS
89    
90    =head2 ADVANCED ACCESS
91    
92    ... via inheritance:    ... via inheritance:
93        
# Line 66  Data::Storage - Interface for accessing Line 105  Data::Storage - Interface for accessing
105      $self->{storage}->insert($proxyObj);      $self->{storage}->insert($proxyObj);
106    
107    
108    =head2 SYNCHRONIZATION
109    
110      my $nodemapping = {
111        'LangText' => 'langtexts.csv',
112        'Currency' => 'currencies.csv',
113        'Country'  => 'countries.csv',
114      };
115    
116      my $propmapping = {
117        'LangText' => [
118          [ 'source:lcountrykey'  =>  'target:country' ],
119          [ 'source:lkey'         =>  'target:key' ],
120          [ 'source:lvalue'       =>  'target:text' ],
121        ],
122        'Currency' => [
123          [ 'source:ckey'         =>  'target:key' ],
124          [ 'source:cname'        =>  'target:text' ],
125        ],
126        'Country' => [
127          [ 'source:ckey'         =>  'target:key' ],
128          [ 'source:cname'        =>  'target:text' ],
129        ],
130      };
131    
132      sub syncResource {
133    
134        my $self = shift;
135        my $node_source = shift;
136        my $mode = shift;
137        my $opts = shift;
138        
139        $mode ||= '';
140        $opts->{erase} ||= 0;
141        
142        $logger->info( __PACKAGE__ . "->syncResource( node_source $node_source mode $mode erase $opts->{erase} )");
143      
144        # resolve metadata for syncing requested resource
145        my $node_target = $nodemapping->{$node_source};
146        my $mapping = $propmapping->{$node_source};
147        
148        if (!$node_target || !$mapping) {
149          # loggger.... "no target, sorry!"
150          print "error while resolving resource metadata", "\n";
151          return;
152        }
153        
154        if ($opts->{erase}) {
155          $self->_erase_all($node_source);
156        }
157      
158        # create new sync object
159        my $sync = Data::Transfer::Sync->new(
160          storages => {
161            L => $self->{bizWorks}->{backend},
162            R => $self->{bizWorks}->{resources},
163          },
164          id_authorities        =>  [qw( L ) ],
165          checksum_authorities  =>  [qw( L ) ],
166          write_protected       =>  [qw( R ) ],
167          verbose               =>  1,
168        );
169        
170        # sync
171        # todo: filter!?
172        $sync->syncNodes( {
173          direction       =>  $mode,                 # | +PUSH | +PULL | -FULL | +IMPORT | -EXPORT
174          method          =>  'checksum',            # | -timestamp | -manual
175          source          =>  "L:$node_source",
176          source_ident    =>  'storage_method:id',
177          source_exclude  =>  [qw( id cs )],
178          target          =>  "R:$node_target",
179          target_ident    =>  'property:oid',
180          mapping         =>  $mapping,
181        } );
182    
183      }
184    
185    
186  =head2 NOTE  =head2 NOTE
187    
188  This module heavily relies on DBI and Tangram, but adds a lot of additional bugs and quirks.    This module heavily relies on DBI and Tangram, but adds a lot of additional bugs and quirks.
189  Please look at their documentation and/or this code for additional information.    Please look at their documentation and/or this code for additional information.
190    
191    
192  =head1 REQUIREMENTS  =head1 REQUIREMENTS
193    
194  For full functionality:    For full functionality:
195    DBI              from CPAN      DBI              from CPAN
196    Tangram          from CPAN      DBD::mysql       from CPAN
197    Class::Tangram   from CPAN      Tangram 2.04     from CPAN         (hmmm, 2.04 won't do in some cases)
198    MySQL::Diff      from http://adamspiers.org/computing/mysqldiff/      Tangram 2.05     from http://...   (2.05 seems okay but there are also additional patches from our side)
199    ... and all their dependencies      Class::Tangram   from CPAN
200        DBD::CSV         from CPAN
201        MySQL::Diff      from http://adamspiers.org/computing/mysqldiff/
202        ... and all their dependencies
203    
204  =cut  =cut
205    
# Line 92  use strict; Line 212  use strict;
212  use warnings;  use warnings;
213    
214  use Data::Storage::Locator;  use Data::Storage::Locator;
215    use Data::Dumper;
216    
217    # TODO: wipe out!
218    use DBI;
219    
220  # TODO: actually implement level (integrate with Log::Dispatch)  # TODO: actually implement level (integrate with Log::Dispatch)
221  my $TRACELEVEL = 0;  my $TRACELEVEL = 0;
# Line 103  sub new { Line 227  sub new {
227    my $invocant = shift;    my $invocant = shift;
228    my $class = ref($invocant) || $invocant;    my $class = ref($invocant) || $invocant;
229    #my @args = normalizeArgs(@_);    #my @args = normalizeArgs(@_);
230      
231    my $arg_locator = shift;    my $arg_locator = shift;
232    my $arg_options = shift;    my $arg_options = shift;
233      
234    #my $self = { STORAGEHANDLE => undef, @_ };    #my $self = { STORAGEHANDLE => undef, @_ };
235    my $self = { STORAGEHANDLE => undef, locator => $arg_locator, options => $arg_options };    my $self = { STORAGEHANDLE => undef, locator => $arg_locator, options => $arg_options };
236    $logger->debug( __PACKAGE__ . "[$self->{locator}->{type}]" . "->new(@_)" );    #$logger->debug( __PACKAGE__ . "[$self->{locator}->{type}]" . "->new(@_)" );
237      $logger->debug( __PACKAGE__ . "[$arg_locator->{type}]" . "->new(@_)" );
238    return bless $self, $class;    return bless $self, $class;
239  }  }
240    
# Line 120  sub AUTOLOAD { Line 245  sub AUTOLOAD {
245    #     - Deep recursion on subroutine "Data::Storage::AUTOLOAD"    #     - Deep recursion on subroutine "Data::Storage::AUTOLOAD"
246    #     - Deep recursion on subroutine "Data::Storage::Handler::Abstract::AUTOLOAD"    #     - Deep recursion on subroutine "Data::Storage::Handler::Abstract::AUTOLOAD"
247    #     - Deep recursion on anonymous subroutine at [...]    #     - Deep recursion on anonymous subroutine at [...]
248    # we also might filter log messages caused by logging itself in "advanced logging of AUTOLOAD calls"    # we also might filter log messages caused by logging to itself in "advanced logging of AUTOLOAD calls"
249        
250    my $self = shift;    my $self = shift;
251    our $AUTOLOAD;    our $AUTOLOAD;
# Line 142  sub AUTOLOAD { Line 267  sub AUTOLOAD {
267        $logstring .= "\t" x $tabcount . "(AUTOLOAD)";        $logstring .= "\t" x $tabcount . "(AUTOLOAD)";
268        # TODO: only ok if logstring doesn't contain        # TODO: only ok if logstring doesn't contain
269        #            e.g. "Data::Storage[Tangram]->insert(SystemEvent=HASH(0x5c0034c))          (AUTOLOAD)"        #            e.g. "Data::Storage[Tangram]->insert(SystemEvent=HASH(0x5c0034c))          (AUTOLOAD)"
270        # but that would be way too specific as long as we don't have an abstract handler for this  ;)        # but that would be _way_ too specific as long as we don't have an abstract handler for this  ;)
271        $logger->debug( $logstring );        $logger->debug( $logstring );
272          #print join('; ', @_);
273      }      }
274            
275    # filtering AUTOLOAD calls    # filtering AUTOLOAD calls and first-time-touch of the actual storage impl
276    if ($self->_filter_AUTOLOAD($method)) {    if ($self->_filter_AUTOLOAD($method)) {
277        #print "_accessStorage\n";
278      $self->_accessStorage();      $self->_accessStorage();
279      $self->{STORAGEHANDLE}->$method(@_);      $self->{STORAGEHANDLE}->$method(@_);
280    }    }
# Line 188  sub _accessStorage { Line 315  sub _accessStorage {
315    
316  sub _createStorageHandle {  sub _createStorageHandle {
317    my $self = shift;    my $self = shift;
   
318    my $type = $self->{locator}->{type};    my $type = $self->{locator}->{type};
319    $logger->debug( __PACKAGE__ .  "[$type]" . "->_createStorageHandle()" );    $logger->debug( __PACKAGE__ .  "[$type]" . "->_createStorageHandle()" );
320    
321    my $pkg = "Data::Storage::Handler::" . $type . "";    my $pkg = "Data::Storage::Handler::" . $type . "";
322        
323    # propagate args to handler    # try to load perl module at runtime
324    # needs some more thoughts! (not only "dbi" to Tangram, when (in future) db is not more the common case)    my $evalstr = "use $pkg;";
325    if ($type eq 'DBI') {    eval($evalstr);
326      use Data::Storage::Handler::DBI;    if ($@) {
327      #my @args = %{$self->{locator}->{dbi}};      $logger->error( __PACKAGE__ .  "[$type]" . "->_createStorageHandle(): $@" );
328      my @args = %{$self->{locator}};      return;
     # create new storage handle  
     $self->{STORAGEHANDLE} = $pkg->new( @args );  
   }  
   if ($type eq 'Tangram') {  
     use Data::Storage::Handler::Tangram;  
     #$self->{STORAGEHANDLE} = $pkg->new( dsn => $self->{locator}->{dbi}->{dsn} );  
     #my @args = %{$self->{locator}->{dbi}};  
     my @args = %{$self->{locator}};  
     # create new storage handle  
     $self->{STORAGEHANDLE} = $pkg->new( @args );  
   
     #$self->{STORAGEHANDLE_UNDERLYING} = $self->{STORAGEHANDLE}->getUnderlyingStorage();  
     #$self->{STORAGEHANDLE_UNDERLYING}->_configureCOREHANDLE();  
329    }    }
330        
331      # build up some additional arguments to pass on
332      #my @args = %{$self->{locator}};
333      my @args = ();
334    
335      # - create new storage handle object
336      # - propagate arguments to handler
337      # - pass locator by reference to be able to store status- or meta-information in it
338      $self->{STORAGEHANDLE} = $pkg->new( locator => $self->{locator}, @args );
339    
340  }  }
341    
342  sub addLogDispatchHandler {  sub addLogDispatchHandler {
# Line 246  sub addLogDispatchHandler { Line 368  sub addLogDispatchHandler {
368  }  }
369    
370  sub removeLogDispatchHandler {  sub removeLogDispatchHandler {
371      my $self = shift;
372        my $self = shift;    my $name = shift;
373        my $name = shift;    #my $logger = shift;
374        #my $logger = shift;    $logger->remove($name);
   
       $logger->remove($name);  
   
375  }  }
376    
377  sub getDbName {  sub getDbName {
# Line 263  sub getDbName { Line 382  sub getDbName {
382    return $database_name;    return $database_name;
383  }  }
384    
385    sub testAvailability {
386      my $self = shift;
387      my $status = $self->testDsn();
388      $self->{locator}->{status}->{available} = $status;
389      return $status;
390    }
391    
392    sub isConnected {
393      my $self = shift;
394      # TODO: REVIEW!
395      return 1 if $self->{STORAGEHANDLE};
396    }
397    
398  sub testDsn {  sub testDsn {
399    my $self = shift;    my $self = shift;
400    my $dsn = $self->{locator}->{dbi}->{dsn};    my $dsn = $self->{locator}->{dbi}->{dsn};
# Line 270  sub testDsn { Line 402  sub testDsn {
402    if ( my $dbh = DBI->connect($dsn, '', '', {    if ( my $dbh = DBI->connect($dsn, '', '', {
403                                                        PrintError => 0,                                                        PrintError => 0,
404                                                        } ) ) {                                                        } ) ) {
405        
406        # TODO: REVIEW
407      $dbh->disconnect();      $dbh->disconnect();
408        
409      return 1;      return 1;
410    } else {    } else {
411      $logger->error( __PACKAGE__ .  "[$self->{locator}->{type}]" . "->testDsn(): " . "DBI-error: " . $DBI::errstr );      $logger->warning( __PACKAGE__ .  "[$self->{locator}->{type}]" . "->testDsn(): " . "DBI-error: " . $DBI::errstr );
412    }    }
413  }  }
414    
 sub createDb {  
   my $self = shift;  
   my $dsn = $self->{locator}->{dbi}->{dsn};  
   
   $logger->debug( __PACKAGE__ .  "->createDb( dsn $dsn )" );  
   
   $dsn =~ s/database=(.+?);//;  
   my $database_name = $1;  
   
   my $ok;  
     
   if ( my $dbh = DBI->connect($dsn, '', '', {  
                                                       PrintError => 0,  
                                                       } ) ) {  
     if ($database_name) {  
       if ($dbh->do("CREATE DATABASE $database_name;")) {  
         $ok = 1;  
       }  
     }  
     $dbh->disconnect();  
   }  
     
   return $ok;  
     
 }  
   
415  sub dropDb {  sub dropDb {
416    my $self = shift;    my $self = shift;
417    my $dsn = $self->{locator}->{dbi}->{dsn};    my $dsn = $self->{locator}->{dbi}->{dsn};
# Line 322  sub dropDb { Line 431  sub dropDb {
431          $ok = 1;          $ok = 1;
432        }        }
433      }      }
434    
435      $dbh->disconnect();      $dbh->disconnect();
436    
437    }    }
438        
439    return $ok;    return $ok;
440  }  }
441    
 sub isConnected {  
   my $self = shift;  
   return 1 if $self->{STORAGEHANDLE};  
 }  
   
442  1;  1;
443  __END__  __END__
444    
445    
446  =head1 DESCRIPTION  =head1 DESCRIPTION
447    
448  Data::Storage is module for a accessing various "data structures" stored inside  =head2 Data::Storage
 various "data containers". It sits on top of DBI and/or Tangram.  
449    
450      Data::Storage is a module for accessing various "data structures / kinds of structured data" stored inside
451      various "data containers".
452      We tried to use the AdapterPattern (http://c2.com/cgi/wiki?AdapterPattern) to implement a wrapper-layer
453      around core CPAN modules (Tangram, DBI).
454    
455    =head2 Why?
456    
457      You will get a better code-structure (not bad for later maintenance) in growing Perl code projects,
458      especially when using multiple database connections at the same time.
459      You will be able to switch between different _kinds_ of implementations used for storing data.
460      Your code will use the very same API to access these storage layers.
461          ... implementation has to be changed for now
462      Maybe you will be able to switch "on-the-fly" without changing any bits in code in the future....
463          ... but that's not the focus
464    
465  =head1 AUTHORS / COPYRIGHT  =head2 What else?
466    
467      Having this, we were able to do implement a generic data synchronization module more easy,
468      please look at Data::Transfer.
469    
 The Data::Storage module is Copyright (c) 2002 Andreas Motl.  
 All rights reserved.  
470    
471  You may distribute it under the terms of either the GNU General Public  =head1 AUTHORS / COPYRIGHT
472  License or the Artistic License, as specified in the Perl README file.  
473      The Data::Storage module is Copyright (c) 2002 Andreas Motl.
474      All rights reserved.
475      You may distribute it under the terms of either the GNU General Public
476      License or the Artistic License, as specified in the Perl README file.
477    
478    
479  =head1 ACKNOWLEDGEMENTS  =head1 ACKNOWLEDGEMENTS
480    
481  Larry Wall for Perl, Tim Bunce for DBI, Jean-Louis Leroy for Tangram and Set::Object,    Larry Wall for Perl, Tim Bunce for DBI, Jean-Louis Leroy for Tangram and Set::Object,
482  Sam Vilain for Class::Tangram, Adam Spiers for MySQL::Diff and all contributors.    Sam Vilain for Class::Tangram, Jochen Wiedmann and Jeff Zucker for DBD::CSV & Co.,
483      Adam Spiers for MySQL::Diff and all contributors.
484    
485    
486  =head1 SUPPORT / WARRANTY  =head1 SUPPORT / WARRANTY
487    
488  Data::Storage is free software. IT COMES WITHOUT WARRANTY OF ANY KIND.    Data::Storage is free software. IT COMES WITHOUT WARRANTY OF ANY KIND.
489    
490    
491  =head1 TODO  =head1 TODO
492    
493    
494  =head2 Handle the following errors/cases:  =head2 BUGS
495    
496    "DBI-Error [Tangram]: DBD::mysql::st execute failed: Unknown column 't1.requestdump' in 'field list'"
497    
498  =head3 "DBI-Error [Tangram]: DBD::mysql::st execute failed: Unknown column 't1.requestdump' in 'field list'"    ... occours when operating on object-attributes not introduced yet:
499      this should be detected and appended/replaced through:
500      "Schema-Error detected, maybe (just) an inconsistency.
501      Please check if your declaration in schema-module "a" matches structure in database "b" or try to run"
502      db_setup.pl --dbkey=import --action=deploy
503    
     ... occours when operating on object-attributes not introduced yet:  
     this should be detected and appended/replaced through:  
     "Schema-Error detected, maybe (just) an inconsistency.  
     Please check if your declaration in schema-module "a" matches structure in database "b" or try to run"  
     db_setup.pl --dbkey=import --action=deploy  
504    
505  =head3 Compare schema (structure diff) with database ...  Compare schema (structure diff) with database ...
506    
507    ... when issuing "db_setup.pl --dbkey=import --action=deploy"    ... when issuing "db_setup.pl --dbkey=import --action=deploy"
508    on a database with an already deployed schema, use an additional "--update" then    on a database with an already deployed schema, use an additional "--update" then
# Line 405  Data::Storage is free software. IT COMES Line 531  Data::Storage is free software. IT COMES
531    automatically and this is believed to be the most common case under normal circumstances.    automatically and this is believed to be the most common case under normal circumstances.
532    
533    
534  =head2 Introduce some features:  =head2 FEATURES
535    
536    - Get this stuff together with UML (Unified Modeling Language) and/or standards from ODMG.    - Get this stuff together with UML (Unified Modeling Language) and/or standards from ODMG.
537    - Make it possible to load/save schemas in XMI (XML Metadata Interchange),    - Make it possible to load/save schemas in XMI (XML Metadata Interchange),
# Line 413  Data::Storage is free software. IT COMES Line 539  Data::Storage is free software. IT COMES
539      Integrate/bundle this with a web-/html-based UML modeling tool or      Integrate/bundle this with a web-/html-based UML modeling tool or
540      some other interesting stuff like the "Co-operative UML Editor" from Uni Darmstadt. (web-/java-based)      some other interesting stuff like the "Co-operative UML Editor" from Uni Darmstadt. (web-/java-based)
541    - Enable Round Trip Engineering. Keep code and diagrams in sync. Don't annoy/bother the programmers.    - Enable Round Trip Engineering. Keep code and diagrams in sync. Don't annoy/bother the programmers.
542    - Add some more handlers:    - Add support for some more handlers/locators to be able to
543      - look at DBD::CSV, Text::CSV, XML::CSV, XML::Excel       access the following standards/protocols/interfaces/programs/apis transparently:
544    - Add some more locations/locators:      +  DBD::CSV (via Data::Storage::Handler::DBI)
545      - PerlDAV: http://www.webdav.org/perldav/     (-) Text::CSV, XML::CSV, XML::Excel
546    - Move to t3, use InCASE      -  MAPI
547        -  LDAP
548        -  DAV (look at PerlDAV: http://www.webdav.org/perldav/)
549        -  Mbox (use formail for seperating/splitting entries/nodes)
550        -  Cyrus (cyrdeliver - what about cyrretrieve (export)???)
551        -  use File::DiffTree, use File::Compare
552        -  Hibernate
553        -  "Win32::UserAccountDb"
554        -  "*nix::UserAccountDb"
555        -  .wab - files (Windows Address Book)
556        -  .pst - files (Outlook Post Storage?)
557        -  XML (e.g. via XML::Simple?)
558      - Move to t3, look at InCASE
559      - some kind of security layer for methods/objects
560        - acls (stored via tangram/ldap?) for functions, methods and objects (entity- & data!?)
561        - where are the hooks needed then?
562          - is Data::Storage & Co. okay, or do we have to touch the innards of DBI and/or Tangram?
563          - an attempt to start could be:
564             - 'sub getACLByObjectId($id, $context)'
565             - 'sub getACLByMethodname($id, $context)'
566             - 'sub getACLByName($id, $context)'
567                ( would require a kinda registry to look up these very names pointing to arbitrary locations (code, data, ...) )
568      - add more hooks and various levels
569      - better integrate introduced 'getObjectByGuid'-mechanism from Data::Storage::Handler::Tangram
570    
571    
572  =head3 Links:  =head3 LINKS / REFERENCES
573    
574    Specs:    Specs:
575      UML 1.3 Spec: http://cgi.omg.org/cgi-bin/doc?ad/99-06-08.pdf      UML 1.3 Spec: http://cgi.omg.org/cgi-bin/doc?ad/99-06-08.pdf
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