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# $Id$ |
## ------------------------------------------------------------------------ |
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# |
## |
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# Copyright (c) 2002 Andreas Motl <andreas.motl@ilo.de> |
## $Id$ |
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# |
## |
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# See COPYRIGHT section in pod text below for usage and distribution rights. |
## Copyright (c) 2002 Andreas Motl <andreas.motl@ilo.de> |
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# |
## |
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############################################ |
## See COPYRIGHT section in pod text below for usage and distribution rights. |
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# |
## |
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# $Log$ |
## ------------------------------------------------------------------------ |
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# Revision 1.10 2002/12/07 03:37:23 joko |
## |
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# + updated pod |
## $Log$ |
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# |
## Revision 1.19 2003/02/18 19:22:11 joko |
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# Revision 1.9 2002/12/01 22:15:45 joko |
## + fixed logging |
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# - sub createDb: moved to handler |
## |
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# |
## Revision 1.18 2003/01/30 22:12:17 joko |
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# Revision 1.8 2002/11/29 04:48:23 joko |
## - removed/refactored old code: ->Data::Storage::Handler::Tangram|DBI |
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# + updated pod |
## |
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# |
## Revision 1.17 2003/01/30 21:42:22 joko |
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# Revision 1.7 2002/11/17 06:07:18 joko |
## + minor update: renamed method |
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# + creating the handler is easier than proposed first - for now :-) |
## |
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# + sub testAvailability |
## Revision 1.16 2003/01/20 16:52:13 joko |
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# |
## + now using 'DesignPattern::Object' to create a new 'Data::Storage::Handler::Xyz' on demand - before we did this in a hand-rolled fashion |
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# Revision 1.6 2002/11/09 01:04:58 joko |
## |
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# + updated pod |
## Revision 1.15 2003/01/19 03:12:59 joko |
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# |
## + modified header |
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# Revision 1.5 2002/10/29 19:24:18 joko |
## - removed pod-documentation - now in 'Storage.pod' |
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# - reduced logging |
## |
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# + added some pod |
## Revision 1.14 2002/12/19 16:27:59 joko |
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## - moved 'sub dropDb' to Data::Storage::Handler::DBI |
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# Revision 1.4 2002/10/27 18:35:07 joko |
## |
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# + added pod |
## Revision 1.13 2002/12/17 21:54:12 joko |
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# |
## + feature when using Tangram: |
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# Revision 1.3 2002/10/25 11:40:37 joko |
## + what? each object created should delivered with a globally(!?) unique identifier (GUID) besides the native tangram object id (OID) |
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# + enhanced robustness |
## + patched Tangram::Storage (jonen) |
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# + more logging for debug-levels |
## + enhanced Data::Storage::Schema::Tangram (joko) |
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# + sub dropDb |
## + enhanced Data::Storage::Handler::Tangram 'sub getObjectByGuid' (jonen) |
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# |
## + how? |
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# Revision 1.2 2002/10/17 00:04:29 joko |
## + each concrete (non-abstract) class gets injected with an additional field/property called 'guid' - this is done (dynamically) on schema level |
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# + sub createDb |
## + this property ('guid') gets filled on object creation/insertion from 'sub Tangram::Storage::_insert' using Data::UUID from CPAN |
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# + sub isConnected |
## + (as for now) this property can get accessed by calling 'getObjectByGuid' on the already known storage-handle used throughout the application |
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# + bugfixes regarding "deep recursion" stuff |
## |
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# |
## Revision 1.12 2002/12/12 02:50:15 joko |
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# Revision 1.1 2002/10/10 03:43:12 cvsjoko |
## + this now (unfortunately) needs DBI for some helper functions |
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# + new |
## + TODO: these have to be refactored to another scope! (soon!) |
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# |
## |
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############################################ |
## Revision 1.11 2002/12/11 06:53:19 joko |
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## + updated pod |
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## |
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## Revision 1.10 2002/12/07 03:37:23 joko |
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## + updated pod |
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## |
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## Revision 1.9 2002/12/01 22:15:45 joko |
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## - sub createDb: moved to handler |
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## |
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## Revision 1.8 2002/11/29 04:48:23 joko |
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## + updated pod |
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## |
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## Revision 1.7 2002/11/17 06:07:18 joko |
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## + creating the handler is easier than proposed first - for now :-) |
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## + sub testAvailability |
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## |
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## Revision 1.6 2002/11/09 01:04:58 joko |
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## + updated pod |
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## |
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## Revision 1.5 2002/10/29 19:24:18 joko |
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## - reduced logging |
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## + added some pod |
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## |
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## Revision 1.4 2002/10/27 18:35:07 joko |
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## + added pod |
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## |
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## Revision 1.3 2002/10/25 11:40:37 joko |
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## + enhanced robustness |
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## + more logging for debug-levels |
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## + sub dropDb |
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## |
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## Revision 1.2 2002/10/17 00:04:29 joko |
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## + sub createDb |
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## + sub isConnected |
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## + bugfixes regarding "deep recursion" stuff |
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## |
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## Revision 1.1 2002/10/10 03:43:12 cvsjoko |
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## + new |
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## ------------------------------------------------------------------------ |
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BEGIN { |
BEGIN { |
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$Data::Storage::VERSION = 0.02; |
$Data::Storage::VERSION = 0.03; |
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} |
} |
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=head1 NAME |
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Data::Storage - Interface for accessing various Storage implementations for Perl in an independent way |
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=head1 AIMS |
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- should encapsulate Tangram, DBI, DBD::CSV and LWP:: to access them in an unordinary (more convenient) way ;) |
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- introduce a generic layered structure, refactor *SUBLAYER*-stuff, make (e.g.) this possible: |
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Perl Data::Storage[DBD::CSV] -> Perl LWP:: -> Internet HTTP/FTP/* -> Host Daemon -> csv-file |
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- provide generic synchronization mechanisms across arbitrary/multiple storages based on ident/checksum |
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maybe it's possible to have schema-, structural- and semantical modifications synchronized??? |
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=head1 SYNOPSIS |
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=head2 BASIC ACCESS |
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=head2 ADVANCED ACCESS |
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... via inheritance: |
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use Data::Storage; |
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my $proxyObj = new HttpProxy; |
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$proxyObj->{url} = $url; |
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$proxyObj->{payload} = $content; |
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$self->{storage}->insert($proxyObj); |
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use Data::Storage; |
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my $proxyObj = HttpProxy->new( |
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url => $url, |
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payload => $content, |
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); |
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$self->{storage}->insert($proxyObj); |
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=head2 SYNCHRONIZATION |
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my $nodemapping = { |
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'LangText' => 'langtexts.csv', |
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'Currency' => 'currencies.csv', |
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'Country' => 'countries.csv', |
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}; |
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my $propmapping = { |
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'LangText' => [ |
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[ 'source:lcountrykey' => 'target:country' ], |
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[ 'source:lkey' => 'target:key' ], |
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[ 'source:lvalue' => 'target:text' ], |
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], |
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'Currency' => [ |
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[ 'source:ckey' => 'target:key' ], |
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[ 'source:cname' => 'target:text' ], |
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], |
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'Country' => [ |
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[ 'source:ckey' => 'target:key' ], |
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[ 'source:cname' => 'target:text' ], |
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], |
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}; |
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sub syncResource { |
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my $self = shift; |
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my $node_source = shift; |
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my $mode = shift; |
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my $opts = shift; |
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$mode ||= ''; |
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$opts->{erase} ||= 0; |
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$logger->info( __PACKAGE__ . "->syncResource( node_source $node_source mode $mode erase $opts->{erase} )"); |
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# resolve metadata for syncing requested resource |
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my $node_target = $nodemapping->{$node_source}; |
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my $mapping = $propmapping->{$node_source}; |
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if (!$node_target || !$mapping) { |
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# loggger.... "no target, sorry!" |
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print "error while resolving resource metadata", "\n"; |
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return; |
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} |
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if ($opts->{erase}) { |
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$self->_erase_all($node_source); |
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} |
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# create new sync object |
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my $sync = Data::Transfer::Sync->new( |
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storages => { |
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L => $self->{bizWorks}->{backend}, |
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R => $self->{bizWorks}->{resources}, |
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}, |
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id_authorities => [qw( L ) ], |
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checksum_authorities => [qw( L ) ], |
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write_protected => [qw( R ) ], |
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verbose => 1, |
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); |
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# sync |
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# todo: filter!? |
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$sync->syncNodes( { |
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direction => $mode, # | +PUSH | +PULL | -FULL | +IMPORT | -EXPORT |
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method => 'checksum', # | -timestamp | -manual |
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source => "L:$node_source", |
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source_ident => 'storage_method:id', |
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source_exclude => [qw( id cs )], |
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target => "R:$node_target", |
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target_ident => 'property:oid', |
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mapping => $mapping, |
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} ); |
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} |
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=head2 NOTE |
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This module heavily relies on DBI and Tangram, but adds a lot of additional bugs and quirks. |
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Please look at their documentation and/or this code for additional information. |
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=head1 REQUIREMENTS |
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For full functionality: |
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DBI from CPAN |
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DBD::mysql from CPAN |
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Tangram 2.04 from CPAN (hmmm, 2.04 won't do in some cases) |
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Tangram 2.05 from http://... (2.05 seems okay but there are also additional patches from our side) |
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Class::Tangram from CPAN |
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DBD::CSV from CPAN |
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MySQL::Diff from http://adamspiers.org/computing/mysqldiff/ |
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... and all their dependencies |
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=cut |
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# The POD text continues at the end of the file. |
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package Data::Storage; |
package Data::Storage; |
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use strict; |
use strict; |
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use warnings; |
use warnings; |
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use Data::Storage::Locator; |
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use Data::Dumper; |
use Data::Dumper; |
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# FIXME: wipe out! |
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use DBI; |
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use Data::Storage::Locator; |
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use DesignPattern::Object; |
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# TODO: actually implement level (integrate with Log::Dispatch) |
# TODO: actually implement level (integrate with Log::Dispatch) |
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my $TRACELEVEL = 0; |
my $TRACELEVEL = 0; |
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my $arg_locator = shift; |
my $arg_locator = shift; |
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my $arg_options = shift; |
my $arg_options = shift; |
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#my @args = @_; |
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#@args ||= (); |
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if (!$arg_locator) { |
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$logger->critical( __PACKAGE__ . "->new: No locator passed in!" ); |
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return; |
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} |
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#print Dumper($arg_locator); |
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#my $self = { STORAGEHANDLE => undef, @_ }; |
#my $self = { STORAGEHANDLE => undef, @_ }; |
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my $self = { STORAGEHANDLE => undef, locator => $arg_locator, options => $arg_options }; |
my $self = { STORAGEHANDLE => undef, locator => $arg_locator, options => $arg_options }; |
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#$logger->debug( __PACKAGE__ . "[$self->{locator}->{type}]" . "->new(@_)" ); |
#$logger->debug( __PACKAGE__ . "[$self->{locator}->{type}]" . "->new(@_)" ); |
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$logger->debug( __PACKAGE__ . "[$arg_locator->{type}]" . "->new(@_)" ); |
$logger->debug( __PACKAGE__ . "[$arg_locator->{type}]" . "->new()" ); |
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return bless $self, $class; |
return bless $self, $class; |
132 |
} |
} |
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# advanced logging of AUTOLOAD calls ... |
# advanced logging of AUTOLOAD calls ... |
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# ... nice but do it only when TRACING (TODO) is enabled |
# ... nice but do it only when TRACING (TODO) is enabled |
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if ($TRACELEVEL) { |
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my $logstring = ""; |
my $logstring = ""; |
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$logstring .= __PACKAGE__ . "[$self->{locator}->{type}]" . "->" . $method; |
$logstring .= __PACKAGE__ . "[$self->{locator}->{type}]" . "->" . $method; |
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#print "count: ", $#_, "\n"; |
#print "count: ", $#_, "\n"; |
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# TODO: only ok if logstring doesn't contain |
# TODO: only ok if logstring doesn't contain |
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# e.g. "Data::Storage[Tangram]->insert(SystemEvent=HASH(0x5c0034c)) (AUTOLOAD)" |
# e.g. "Data::Storage[Tangram]->insert(SystemEvent=HASH(0x5c0034c)) (AUTOLOAD)" |
162 |
# but that would be _way_ too specific as long as we don't have an abstract handler for this ;) |
# but that would be _way_ too specific as long as we don't have an abstract handler for this ;) |
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if ($TRACELEVEL) { |
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$logger->debug( $logstring ); |
$logger->debug( $logstring ); |
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#print join('; ', @_); |
#print join('; ', @_); |
166 |
} |
} |
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# filtering AUTOLOAD calls and first-time-touch of the actual storage impl |
# filtering AUTOLOAD calls and first-time-touch of the actual storage impl |
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if ($self->_filter_AUTOLOAD($method)) { |
if ($self->_filter_AUTOLOAD($method)) { |
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#print "_accessStorage\n"; |
#print "=== FILTER!", "\n"; |
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$self->_accessStorage(); |
$self->_accessStorageHandle(); |
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$self->{STORAGEHANDLE}->$method(@_); |
if ($self->{STORAGEHANDLE}) { |
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return $self->{STORAGEHANDLE}->$method(@_); |
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} else { |
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$logger->critical( __PACKAGE__ . "->AUTOLOAD: ERROR: " . $logstring ); |
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return; |
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} |
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} |
} |
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} |
} |
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} |
} |
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sub normalizeArgs { |
sub _accessStorageHandle { |
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my %args = @_; |
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if (!$args{dsn} && $args{meta}{dsn}) { |
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$args{dsn} = $args{meta}{dsn}; |
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} |
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my @result = %args; |
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return @result; |
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} |
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sub _accessStorage { |
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my $self = shift; |
my $self = shift; |
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# TODO: to some tracelevel! |
# TODO: to some tracelevel! |
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#print "=========== _accessStorage", "\n"; |
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if ($TRACELEVEL) { |
if ($TRACELEVEL) { |
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$logger->debug( __PACKAGE__ . "[$self->{locator}->{type}]" . "->_accessStorage()" ); |
$logger->debug( __PACKAGE__ . "[$self->{locator}->{type}]" . "->_accessStorageHandle()" ); |
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} |
} |
201 |
if (!$self->{STORAGEHANDLE}) { |
if (!$self->{STORAGEHANDLE}) { |
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$self->_createStorageHandle(); |
return $self->_createStorageHandle(); |
203 |
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} |
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} |
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sub _createStorageHandle1 { |
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my $self = shift; |
208 |
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my $type = $self->{locator}->{type}; |
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$logger->debug( __PACKAGE__ . "[$type]" . "->_createStorageHandle()" ); |
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my $pkg = "Data::Storage::Handler::" . $type . ""; |
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# try to load perl module at runtime |
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my $evalstr = "use $pkg;"; |
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eval($evalstr); |
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if ($@) { |
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$logger->error( __PACKAGE__ . "[$type]" . "->_createStorageHandle(): $@" ); |
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return; |
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} |
} |
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# build up some additional arguments to pass on |
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#my @args = %{$self->{locator}}; |
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my @args = (); |
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# - create new storage handle object |
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# - propagate arguments to handler |
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# - pass locator by reference to be able to store status- or meta-information in it |
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$self->{STORAGEHANDLE} = $pkg->new( locator => $self->{locator}, @args ); |
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} |
} |
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sub _createStorageHandle { |
sub _createStorageHandle { |
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my $type = $self->{locator}->{type}; |
my $type = $self->{locator}->{type}; |
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$logger->debug( __PACKAGE__ . "[$type]" . "->_createStorageHandle()" ); |
$logger->debug( __PACKAGE__ . "[$type]" . "->_createStorageHandle()" ); |
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#print Dumper($self); |
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#exit; |
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my $pkg = "Data::Storage::Handler::" . $type . ""; |
my $pkg = "Data::Storage::Handler::" . $type . ""; |
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# try to load perl module at runtime |
# try to load perl module at runtime |
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=pod |
244 |
my $evalstr = "use $pkg;"; |
my $evalstr = "use $pkg;"; |
245 |
eval($evalstr); |
eval($evalstr); |
246 |
if ($@) { |
if ($@) { |
256 |
# - propagate arguments to handler |
# - propagate arguments to handler |
257 |
# - pass locator by reference to be able to store status- or meta-information in it |
# - pass locator by reference to be able to store status- or meta-information in it |
258 |
$self->{STORAGEHANDLE} = $pkg->new( locator => $self->{locator}, @args ); |
$self->{STORAGEHANDLE} = $pkg->new( locator => $self->{locator}, @args ); |
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=cut |
260 |
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$self->{STORAGEHANDLE} = DesignPattern::Object->fromPackage( $pkg, locator => $self->{locator} ); |
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return 1; |
263 |
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264 |
} |
} |
265 |
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$logger->remove($name); |
$logger->remove($name); |
299 |
} |
} |
300 |
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sub getDbName { |
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my $self = shift; |
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my $dsn = $self->{locator}->{dbi}->{dsn}; |
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$dsn =~ m/database=(.+?);/; |
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my $database_name = $1; |
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return $database_name; |
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} |
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sub testDsn { |
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my $self = shift; |
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my $dsn = $self->{locator}->{dbi}->{dsn}; |
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my $result; |
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if ( my $dbh = DBI->connect($dsn, '', '', { |
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PrintError => 0, |
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} ) ) { |
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# TODO: REVIEW |
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$dbh->disconnect(); |
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return 1; |
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} else { |
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$logger->warning( __PACKAGE__ . "[$self->{locator}->{type}]" . "->testDsn(): " . "DBI-error: " . $DBI::errstr ); |
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} |
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} |
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sub testAvailability { |
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my $self = shift; |
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my $status = $self->testDsn(); |
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$self->{locator}->{status}->{available} = $status; |
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return $status; |
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} |
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sub dropDb { |
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my $self = shift; |
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my $dsn = $self->{locator}->{dbi}->{dsn}; |
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$logger->debug( __PACKAGE__ . "->dropDb( dsn $dsn )" ); |
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$dsn =~ s/database=(.+?);//; |
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my $database_name = $1; |
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my $ok; |
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if ( my $dbh = DBI->connect($dsn, '', '', { |
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PrintError => 0, |
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} ) ) { |
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if ($database_name) { |
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|
if ($dbh->do("DROP DATABASE $database_name;")) { |
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|
$ok = 1; |
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|
} |
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} |
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$dbh->disconnect(); |
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} |
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return $ok; |
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} |
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sub isConnected { |
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|
my $self = shift; |
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return 1 if $self->{STORAGEHANDLE}; |
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} |
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301 |
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302 |
1; |
1; |
303 |
__END__ |
__END__ |
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=head1 DESCRIPTION |
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Data::Storage is a module for accessing various "data structures" stored inside |
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various "data containers". It sits on top of DBI and/or Tangram. |
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=head1 AUTHORS / COPYRIGHT |
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The Data::Storage module is Copyright (c) 2002 Andreas Motl. |
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All rights reserved. |
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You may distribute it under the terms of either the GNU General Public |
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License or the Artistic License, as specified in the Perl README file. |
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=head1 ACKNOWLEDGEMENTS |
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Larry Wall for Perl, Tim Bunce for DBI, Jean-Louis Leroy for Tangram and Set::Object, |
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Sam Vilain for Class::Tangram, Jochen Wiedmann and Jeff Zucker for DBD::CSV and related, |
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Adam Spiers for MySQL::Diff and all contributors. |
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=head1 SUPPORT / WARRANTY |
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Data::Storage is free software. IT COMES WITHOUT WARRANTY OF ANY KIND. |
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=head1 TODO |
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=head2 BUGS |
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"DBI-Error [Tangram]: DBD::mysql::st execute failed: Unknown column 't1.requestdump' in 'field list'" |
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... occours when operating on object-attributes not introduced yet: |
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this should be detected and appended/replaced through: |
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|
"Schema-Error detected, maybe (just) an inconsistency. |
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Please check if your declaration in schema-module "a" matches structure in database "b" or try to run" |
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db_setup.pl --dbkey=import --action=deploy |
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Compare schema (structure diff) with database ... |
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... when issuing "db_setup.pl --dbkey=import --action=deploy" |
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on a database with an already deployed schema, use an additional "--update" then |
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|
to lift the schema inside the database to the current declared schema. |
|
|
You will have to approve removals and changes on field-level while |
|
|
new objects and new fields are introduced silently without any interaction needed. |
|
|
In future versions there may be additional options to control silent processing of |
|
|
removals and changes. |
|
|
See this CRUD-table applying to the actions occouring on Classes and Class variables when deploying schemas, |
|
|
don't mix this up with CRUD-actions on Objects, these are already handled by (e.g.) Tangram itself. |
|
|
Classes: |
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|
C create -> yes, handled automatically |
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|
R retrieve -> no, not subject of this aspect since it is about deployment only |
|
|
U update -> yes, automatically for Class meta-attributes, yes/no for Class variables (look at the rules down here) |
|
|
D delete -> yes, just by user-interaction |
|
|
Class variables: |
|
|
C create -> yes, handled automatically |
|
|
R retrieve -> no, not subject of this aspect since it is about deployment only |
|
|
U update -> yes, just by user-interaction; maybe automatically if it can be determined that data wouldn't be lost |
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|
D delete -> yes, just by user-interaction |
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|
|
It's all about not to be able to loose data simply while this is in pre-alpha stage. |
|
|
And loosing data by being able to modify and redeploy schemas easily is definitely quite easy. |
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|
|
As we can see, creations of Classes and new Class variables is handled |
|
|
automatically and this is believed to be the most common case under normal circumstances. |
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|
|
=head2 FEATURES |
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|
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|
|
- Get this stuff together with UML (Unified Modeling Language) and/or standards from ODMG. |
|
|
- Make it possible to load/save schemas in XMI (XML Metadata Interchange), |
|
|
which seems to be most commonly used today, perhaps handle objects with OIFML. |
|
|
Integrate/bundle this with a web-/html-based UML modeling tool or |
|
|
some other interesting stuff like the "Co-operative UML Editor" from Uni Darmstadt. (web-/java-based) |
|
|
- Enable Round Trip Engineering. Keep code and diagrams in sync. Don't annoy/bother the programmers. |
|
|
- Add support for some more handlers/locators to be able to |
|
|
access the following standards/protocols/interfaces/programs/apis transparently: |
|
|
+ DBD::CSV (via Data::Storage::Handler::DBI) |
|
|
(-) Text::CSV, XML::CSV, XML::Excel |
|
|
- MAPI |
|
|
- LDAP |
|
|
- DAV (look at PerlDAV: http://www.webdav.org/perldav/) |
|
|
- Mbox (use formail for seperating/splitting entries/nodes) |
|
|
- Cyrus (cyrdeliver - what about cyrretrieve (export)???) |
|
|
- use File::DiffTree, use File::Compare |
|
|
- Hibernate |
|
|
- "Win32::UserAccountDb" |
|
|
- "*nix::UserAccountDb" |
|
|
- .wab - files (Windows Address Book) |
|
|
- .pst - files (Outlook Post Storage?) |
|
|
- XML (e.g. via XML::Simple?) |
|
|
- Move to t3, look at InCASE |
|
|
- some kind of security layer for methods/objects |
|
|
- acls (stored via tangram/ldap?) for functions, methods and objects (entity- & data!?) |
|
|
- where are the hooks needed then? |
|
|
- is Data::Storage & Co. okay, or do we have to touch the innards of DBI and/or Tangram? |
|
|
- an attempt to start could be: |
|
|
- 'sub getACLByObjectId($id, $context)' |
|
|
- 'sub getACLByMethodname($id, $context)' |
|
|
- 'sub getACLByName($id, $context)' |
|
|
( would require a kinda registry to look up these very names pointing to arbitrary locations (code, data, ...) ) |
|
|
|
|
|
|
|
|
|
|
|
=head3 LINKS / REFERENCES |
|
|
|
|
|
Specs: |
|
|
UML 1.3 Spec: http://cgi.omg.org/cgi-bin/doc?ad/99-06-08.pdf |
|
|
XMI 1.1 Spec: http://cgi.omg.org/cgi-bin/doc?ad/99-10-02.pdf |
|
|
XMI 2.0 Spec: http://cgi.omg.org/docs/ad/01-06-12.pdf |
|
|
ODMG: http://odmg.org/ |
|
|
OIFML: http://odmg.org/library/readingroom/oifml.pdf |
|
|
|
|
|
CASE Tools: |
|
|
Rational Rose (commercial): http://www.rational.com/products/rose/ |
|
|
Together (commercial): http://www.oi.com/products/controlcenter/index.jsp |
|
|
InCASE - Tangram-based Universal Object Editor |
|
|
Sybase PowerDesigner: http://www.sybase.com/powerdesigner |
|
|
|
|
|
UML Editors: |
|
|
Fujaba (free, university): http://www.fujaba.de/ |
|
|
ArgoUML (free): http://argouml.tigris.org/ |
|
|
Poseidon (commercial): http://www.gentleware.com/products/poseidonDE.php3 |
|
|
Co-operative UML Editor (research): http://www.darmstadt.gmd.de/concert/activities/internal/umledit.html |
|
|
Metamill (commercial): http://www.metamill.com/ |
|
|
Violet (university, research, education): http://www.horstmann.com/violet/ |
|
|
PyUt (free): http://pyut.sourceforge.net/ |
|
|
(Dia (free): http://www.lysator.liu.se/~alla/dia/) |
|
|
UMLet (free, university): http://www.swt.tuwien.ac.at/umlet/index.html |
|
|
Voodoo (free): http://voodoo.sourceforge.net/ |
|
|
Umbrello UML Modeller: http://uml.sourceforge.net/ |
|
|
|
|
|
UML Tools: |
|
|
http://www.objectsbydesign.com/tools/umltools_byPrice.html |
|
|
|
|
|
Further readings: |
|
|
http://www.google.com/search?q=web+based+uml+editor&hl=en&lr=&ie=UTF-8&oe=UTF-8&start=10&sa=N |
|
|
http://www.fernuni-hagen.de/DVT/Aktuelles/01FHHeidelberg.pdf |
|
|
http://www.enhyper.com/src/documentation/ |
|
|
http://cis.cs.tu-berlin.de/Dokumente/Diplomarbeiten/2001/skinner.pdf |
|
|
http://citeseer.nj.nec.com/vilain00diagrammatic.html |
|
|
http://archive.devx.com/uml/articles/Smith01/Smith01-3.asp |
|
|
|
|