script/korapxml2krill

#!/usr/bin/env perl
use strict;
use warnings;
use FindBin;
BEGIN { unshift @INC, "$FindBin::Bin/../lib" };
use File::Spec::Functions qw/catfile catdir/;
use Getopt::Long qw/GetOptions :config no_auto_abbrev/;
use Benchmark qw/:hireswallclock/;
use IO::Compress::Gzip qw/$GzipError/;
use POSIX qw/ceil/;
use Log::Log4perl;
use Pod::Usage;
use Cache::FastMmap;
use Directory::Iterator;
use KorAP::XML::Krill;
use KorAP::XML::Archive;
use KorAP::XML::Tokenizer;
use KorAP::XML::Batch::File;
use Parallel::ForkManager;
use v5.10;
use Sys::Info;
use Sys::Info::Constants qw( :device_cpu );
use File::Glob ':bsd_glob';

# use KorAP::XML::ForkPool;
# TODO: use Parallel::Loops
# TODO: make output files

# TODO: Use KorAP::XML::ForkPool!

# CHANGES:
# ----------------------------------------------------------
# 2013/11/25
# - Initial release
#
# 2014/10/29
# - Merges foundry data to create indexer friendly documents
#
# 2016/02/04
# - renamed to korapxml2krill
# - added Schreibgebrauch support
#
# 2016/02/12
# - fixed foundry skipping
# - Support overwrite in archive processing
#
# 2016/02/14
# - Added version information
# - Added support for archive files
#
# 2016/02/15
# - Fixed temporary directory bug
# - Improved skipping before unzipping
# - Added EXPERIMENTAL concurrency support
#
# 2016/02/23
# - Merge korapxml2krill and korapxml2krill_dir
#
# 2016/02/27
# - Added extract function
#
# 2016/03/17
# - Added meta switch
#
# 2016/03/18
# - Added meta data caching
#
# 2016/06/27
# - Added multi archive support
# - Added prefix negation support
# - Added Malt#Dependency support
#
# 2016/07/06
# - Added MDParser#Dependency
#
# 2016/10/15
# - Fixed temporary path issue in script
#
# 2016/10/24
# - Improved Windows support
#
# 2016/10/24
# - Added support for document extraction
#
# 2016/10/27
# - Added wildcard support for document extraction
#
# 2016/12/21
# - added support for base-sentences and base-tokenizations
#
# 2017/01/20
# - added support for DRuKoLa annotations
#
# 2017/02/08
# - added support for pagebreak annotations
#
# 2017/04/06
# - added support for wildcards in input
#
# ----------------------------------------------------------

our $LAST_CHANGE = '2017/04/06';
our $LOCAL = $FindBin::Bin;
our $VERSION_MSG = <<"VERSION";
Version $KorAP::XML::Krill::VERSION - diewald\@ids-mannheim.de - $LAST_CHANGE
VERSION

# Parse comand
my $cmd;
our @ARGV;
if ($ARGV[0] && index($ARGV[0], '-') != 0) {
  $cmd = shift @ARGV;
};

my (@skip, @sigle, @anno, @input);
my $text;

# Parse options from the command line
GetOptions(
  'input|i=s'   => \@input,
  'output|o=s'  => \(my $output),
  'overwrite|w' => \(my $overwrite),
  'meta|m=s'    => \(my $meta),
  'token|t=s'   => \(my $token_base = 'OpenNLP#tokens'),
  'base-sentences|bs=s' => \(my $base_sentences = ''),
  'base-paragraphs|bp=s' => \(my $base_paragraphs = ''),
  'base-pagebreaks|bpb=s' => \(my $base_pagebreaks = ''),
  'gzip|z'      => \(my $gzip),
  'skip|s=s'    => \@skip,
  'sigle|sg=s'  => \@sigle,
  'cache|c=s'   => \(my $cache_file = 'korapxml2krill.cache'),
  'log|l=s'     => \(my $log_level = 'ERROR'),
  'anno|a=s'    => \@anno,
  'primary|p!'  => \(my $primary),
  'pretty|y'    => \(my $pretty),
  'jobs|j=i'    => \(my $jobs = 0),
  'cache-size|cs=s'  => \(my $cache_size = '50m'),
  'cache-delete|cd!' => \(my $cache_delete = 1),
  'cache-init|ci!'   => \(my $cache_init = 1),
  'help|h'      => sub {
    pod2usage(
      -sections => 'NAME|SYNOPSIS|ARGUMENTS|OPTIONS',
      -verbose  => 99,
      -msg      => $VERSION_MSG,
      -output   => '-'
    );
  },
  'version|v'   => sub {
    pod2usage(
      -verbose  => 0,
      -msg      => $VERSION_MSG,
      -output   => '-'
    )
  }
);

$base_sentences  = lc $base_sentences;
$base_paragraphs = lc $base_paragraphs;
$base_pagebreaks = lc $base_pagebreaks;

my %ERROR_HASH = (
  -sections => 'NAME|SYNOPSIS|ARGUMENTS|OPTIONS',
  -verbose  => 99,
  -msg      => $VERSION_MSG,
  -output   => '-',
  -exit     => 1
);

# Input has to be defined
pod2usage(%ERROR_HASH) unless @input;

# Gzip has no effect, if no output is given
pod2usage(%ERROR_HASH) if $gzip && !$output;

# Initialize log4perl object
Log::Log4perl->init({
  'log4perl.rootLogger' => uc($log_level) . ', STDERR',
  'log4perl.appender.STDERR' => 'Log::Log4perl::Appender::ScreenColoredLevels',
  'log4perl.appender.STDERR.layout' => 'PatternLayout',
  'log4perl.appender.STDERR.layout.ConversionPattern' => '[%r] %F %L %c - %m%n'
});

my $log = Log::Log4perl->get_logger('main');


if ($jobs == -1) {
  state $cores = Sys::Info->new->device('CPU')->count;
  $jobs = ceil(5 * $cores);
  $log->info("Run using $jobs jobs");
};


my %skip;
$skip{lc($_)} = 1 foreach @skip;

my @layers;
push(@layers, ['Base', 'Sentences']) unless $base_sentences;
push(@layers, ['Base', 'Paragraphs']) unless $base_paragraphs;

# Connexor
push(@layers, ['Connexor', 'Morpho']);
push(@layers, ['Connexor', 'Syntax']);
push(@layers, ['Connexor', 'Phrase']);
push(@layers, ['Connexor', 'Sentences']);

# CoreNLP
push(@layers, ['CoreNLP', 'NamedEntities']);
push(@layers, ['CoreNLP', 'Sentences']);
push(@layers, ['CoreNLP', 'Morpho']);
push(@layers, ['CoreNLP', 'Constituency']);


# DeReKo
my @dereko_attr = ();
if ($base_sentences eq 'dereko#structure') {
  push @dereko_attr, 'sentences';
};
if ($base_paragraphs eq 'dereko#structure') {
  push @dereko_attr, 'paragraphs';
};

if ($base_pagebreaks eq 'dereko#structure') {
  push @dereko_attr, 'pagebreaks';
};

if ($dereko_attr[0]) {
  push(@layers, ['DeReKo', 'Structure', 'base-' . join('-', @dereko_attr)]);
}
else {
  push(@layers, ['DeReKo', 'Structure']);
};

# Glemm
push(@layers, ['Glemm', 'Morpho']);

# Malt
push(@layers, ['Malt', 'Dependency']);

# MDParser
push(@layers, ['MDParser', 'Dependency']);

# Mate
push(@layers, ['Mate', 'Morpho']);
push(@layers, ['Mate', 'Dependency']);

# OpenNLP
push(@layers, ['OpenNLP', 'Morpho']);
push(@layers, ['OpenNLP', 'Sentences']);

# Schreibgebrauch
push(@layers, ['Sgbr', 'Lemma']);
push(@layers, ['Sgbr', 'Morpho']);

# TreeTagger
push(@layers, ['TreeTagger', 'Morpho']);
push(@layers, ['TreeTagger', 'Sentences']);

# XIP
push(@layers, ['XIP', 'Morpho']);
push(@layers, ['XIP', 'Constituency']);
push(@layers, ['XIP', 'Sentences']);
push(@layers, ['XIP', 'Dependency']);

# DRuKoLa
push(@layers, ['DRuKoLa', 'Morpho']);

# Marmot
push(@layers, ['MarMoT', 'Morpho']);


# Check filters
my @filtered_anno;
if ($skip{'#all'}) {
  foreach (@anno) {
    push @filtered_anno, [ split('#', $_) ];
  };
}

# Add all annotations that are not skipped
else {
  # Add to index file - respect skipping
  foreach my $info (@layers) {
    # Skip if Foundry or Foundry#Layer should be skipped
    unless ($skip{lc($info->[0])} || $skip{lc($info->[0]) . '#' . lc($info->[1])}) {
      push @filtered_anno, $info;
    };
  };
};

# Get tokenization basis
my ($token_base_foundry, $token_base_layer) = split(/#/, $token_base) if ($token_base);

# TODO: This should not be initialized for batch
my $cache = Cache::FastMmap->new(
  share_file => $cache_file,
  cache_size => $cache_size,
  init_file  => $cache_init
);

# Create batch object
my $batch_file = KorAP::XML::Batch::File->new(
  cache     => $cache,
  meta_type => $meta,
  overwrite => $overwrite,
  foundry   => $token_base_foundry,
  layer     => $token_base_layer,
  gzip      => $gzip,
  log       => $log,
  primary   => $primary,
  pretty    => $pretty,
  anno      => \@filtered_anno
);


# Get file name based on path information
sub get_file_name ($) {
  my $i = $input[0];
  if (-d $i) {
    $i =~ s![^\/]+$!!;
  };
  my $file = shift;

  # Remove temp dir fragments
  $file =~ s!^/?tmp/[^/]+!!;
  $file =~ s/^?\/?$i//;
  $file =~ tr/\//-/;
  $file =~ s{^-+}{};
  $file =~ s/^.*?-(.+?-.+?-.+?)$/$1/;
  return $file;
};

# Convert sigle to path construct
s!^\s*([^_]+?)_([^\.]+?)\.(.+?)\s*$!$1/$2/$3! foreach @sigle;

if ($cmd) {
  if ($output && (!-e $output || !-d $output)) {
    print "Directory '$output' does not exist.\n\n";
    exit(0);
  };
};


# Glob files
if (@input) {
  my @new_input = ();

  # Iterate over all inputs
  foreach (@input) {
    push (@new_input, bsd_glob($_));
  };

  if (scalar(@new_input) > scalar(@input)) {
    @input = sort { length($a) <=> length($b) } @new_input;
    print 'Input rewritten to ' . join(',', @input);
  };
};


# Process a single file
unless ($cmd) {
  my $input = $input[0];

  BEGIN {
    $main::TIME = Benchmark->new;
    $main::LAST_STOP = Benchmark->new;
  };

  sub stop_time {
    my $new = Benchmark->new;
    $log->info(
      'The code took: '.
        timestr(timediff($new, $main::LAST_STOP)) .
        ' (overall: ' . timestr(timediff($new, $main::TIME)) . ')'
      );
    $main::LAST_STOP = $new;
  };

  # Create and parse new document
  $input =~ s{([^/])$}{$1/};

  # Process file
  $batch_file->process($input, $output);

  # Delete cache file
  unlink($cache_file) if $cache_delete;

  stop_time;
}

# Extract XML files
elsif ($cmd eq 'extract') {

  # Create new archive object
  if (-f($input[0]) && (my $archive = KorAP::XML::Archive->new($input[0]))) {

    # Check zip capabilities
    unless ($archive->test_unzip) {
      print "Unzip is not installed or incompatible.\n\n";
      exit(1);
    };

    # Add further annotation archived
    $archive->attach($_) foreach @input[1..$#input];

    my $prefix = 1;

    # No sigles given
    unless (@sigle) {

      # Get files
      foreach ($archive->list_texts) {

        # Split path information
        ($prefix, my ($corpus, $doc, $text)) = $archive->split_path($_);

        # TODO: Make this OS independent
        push @sigle, join '/', $corpus, $doc, $text;
      };
    }

    # Check sigle for doc sigles
    else {
      my @new_sigle;

      my $prefix_check = 0;

      # Iterate over all sigle
      foreach (@sigle) {

        # Sigle is a doc sigle
        if ($_ =~ m!^(?:\.[/\\])?[^/\\]+?[/\\][^/\\]+?$!) {

          print "$_ ...";
          # Check if a prefix is needed
          unless ($prefix_check) {

            if ($prefix = $archive->check_prefix) {
              print " with prefix ...";
            };
            $prefix_check = 1;
          };

          print "\n";

          # TODO: Make this OS independent
          my $path = ($prefix ? './' : '') . $_;

          print '... ' . (
            $archive->extract_doc(
              $path, $output, $jobs
            ) ? '' : 'not '
          );
          print "extracted.\n";
        }

        # Sigle is a text sigle
        else {
          push @new_sigle, $_;

          unless ($prefix_check) {

            if ($prefix = $archive->check_prefix) {
              print " with prefix ...";
            };
            $prefix_check = 1;
          };
        };
      };
      @sigle = @new_sigle;
    };

    # Iterate over all given sigles and extract
    foreach (@sigle) {

      print "$_ ...\n";

      # TODO: Make this OS independent
      print '... ' . (

        $archive->extract_text(
          ($prefix ? './' : '') . $_, $output
        ) ? '' : 'not '
      );
      print "extracted.\n";
    };

    print "\n";
    exit(1);
  }

  # Can't create archive object
  else {
    $log->error('Unable to extract from primary archive ' . $input[0]);
  };
}

# Process an archive
elsif ($cmd eq 'archive') {

  # TODO: Support sigles

  # Zero means: everything runs in the parent process
  my $pool = Parallel::ForkManager->new($jobs);

  my $count = 0;  # Texts to process
  my $iter  = 1;  # Current text in process

  # Report on fork message
  $pool->run_on_finish (
    sub {
      my ($pid, $code) = @_;
      my $data = pop;

      print 'Convert ['. ($jobs > 0 ? "\$$pid:" : '') .
        ($iter++) . "/$count]" .
        ($code ? " $code" : '') .
        ' ' . $data->[0] . "\n";
      $data->[1] = undef if $data->[1];
    }
  );

  my $t;
  my $temp;
  print "Reading data ...\n";

  #  unless (Cache::FastMmap->new(
  #    share_file => $cache_file,
  #    cache_size => $cache_size,
  #    init_file => $cache_init
  #  )) {
  #    print "Unable to intialize cache '$cache_file'\n\n";
  #    exit(1);
  #  };

  # Input is a directory
  if (-d $input[0]) {
    my $it = Directory::Iterator->new($input[0]);
    my @dirs;
    my $dir;

    # Todo: Make a DO WHILE
    while (1) {
      if (!$it->is_directory && ($dir = $it->get) && $dir =~ s{/data\.xml$}{}) {
        push @dirs, $dir;
        $it->prune;
      };
      last unless $it->next;
    };

    print "Start processing ...\n";
    $t = Benchmark->new;
    $count = scalar @dirs;

  DIRECTORY_LOOP:
    for (my $i = 0; $i < $count; $i++) {

      my $filename = catfile(
        $output,
        get_file_name($dirs[$i]) . '.json' . ($gzip ? '.gz' : '')
      );

      # Get the next fork
      $pool->start and next DIRECTORY_LOOP;

      if (my $return = $batch_file->process($dirs[$i] => $filename)) {
        $pool->finish(
          0,
          ["Processed " . $filename . ($return == -1 ? " - already existing" : '')]
        );
      }
      else {
        $pool->finish(1, ["Unable to process " . $dirs[$i]]);
      };
    };
  }

  # Input is a file
  elsif (-f($input[0]) && (my $archive = KorAP::XML::Archive->new($input[0]))) {

    unless ($archive->test_unzip) {
      print "Unzip is not installed or incompatible.\n\n";
      exit(1);
    };

    # Add further annotation archived
    $archive->attach($_) foreach @input[1..$#input];

    print "Start processing ...\n";
    $t = Benchmark->new;
    my @dirs = $archive->list_texts;
    $count = scalar @dirs;

  ARCHIVE_LOOP:
    for (my $i = 0; $i < $count; $i++) {

      # Split path information
      my ($prefix, $corpus, $doc, $text) = $archive->split_path($dirs[$i]);

      my $filename = catfile(
        $output,
        get_file_name(
          catfile($corpus, $doc, $text)
            . '.json' . ($gzip ? '.gz' : '')
          )
      );

      # Get the next fork
      $pool->start and next ARCHIVE_LOOP;

      # Create temporary file
      $temp = File::Temp->newdir;

      # TODO: Check if $filename exist at the beginning,
      # because extraction can be horrible slow!

      # Extract from archive
      if ($archive->extract_text($dirs[$i], $temp)) {

        # Create corpus directory
        my $input = catdir("$temp", $corpus);

        # Temporary directory
        my $dir = catdir($input, $doc, $text);

        # Write file
        if (my $return = $batch_file->process($dir => $filename)) {
          # Delete temporary file
          $pool->finish(
            0,
            ["Processed " . $filename . ($return == -1 ? " - already existing" : ''), $temp]
          );
          #$pool->finish(0, ["Processed " . $filename, $temp]);
        }
        else {
          # Delete temporary file
          $pool->finish(1, ["Unable to process " . $dir, $temp]);
        };
      }

      # Unable to extract
      else {
        $pool->finish(1, ["Unable to extract " . $dirs[$i], $temp]);
      };
    };
  }

  else {
    print "Input is neither a directory nor an archive.\n\n";
  };

  $pool->wait_all_children;

  # Delete cache file
  unlink($cache_file) if $cache_delete;

  print "Done.\n";
  print timestr(timediff(Benchmark->new, $t))."\n\n";
}

# Unknown command
else {
  warn "Unknown command '$cmd'.\n\n";
  pod2usage(%ERROR_HASH);
}

__END__

=pod

=encoding utf8

=head1 NAME

korapxml2krill - Merge KorapXML data and create Krill documents


=head1 SYNOPSIS

  korapxml2krill [archive|extract] --input <directory|archive> [options]


=head1 DESCRIPTION

L<KorAP::XML::Krill> is a library to convert KorAP-XML documents to files
compatible with the L<Krill|https://github.com/KorAP/Krill> indexer.
The C<korapxml2krill> command line tool is a simple wrapper to the library.


=head1 INSTALLATION

The preferred way to install L<KorAP::XML::Krill> is to use L<cpanm|App::cpanminus>.

  $ cpanm https://github.com/KorAP/KorAP-XML-Krill.git

In case everything went well, the C<korapxml2krill> tool will
be available on your command line immediately.
Minimum requirement for L<KorAP::XML::Krill> is Perl 5.14.
In addition to work with zip archives, the C<unzip> tool needs to be present.

=head1 ARGUMENTS

  $ korapxml2krill -z --input <directory> --output <filename>

Without arguments, C<korapxml2krill> converts a directory of a single KorAP-XML document.
It expects the input to point to the text level folder.

=over 2

=item B<archive>

  $ korapxml2krill archive -z --input <directory|archive> --output <directory>

Converts an archive of KorAP-XML documents. It expects a directory
(pointing to the corpus level folder) or one or more zip files as input.

=item B<extract>

  $ korapxml2krill extract --input <archive> --output <directory> --sigle <SIGLE>

Extracts KorAP-XML documents from a zip file.

=back


=head1 OPTIONS

=over 2

=item B<--input|-i> <directory|zip file>

Directory or zip file(s) of documents to convert.

Without arguments, C<korapxml2krill> expects a folder of a single KorAP-XML
document, while C<archive> expects a KorAP-XML corpus folder or a zip
file to batch process multiple files.
C<extract> expects zip files only.

C<archive> supports multiple input zip files with the constraint,
that the first archive listed contains all primary data files
and all meta data files.

  -i file/news.zip -i file/news.malt.zip -i "#file/news.tt.zip"

Input may also be defined using BSD glob wildcards.

  -i 'file/news*.zip'

The extended input array will be sorted in length order, so the shortest
path needs to contain all primary data files and all meta data files.

(The directory structure follows the base directory format,
that may include a C<.> root folder.
In this case further archives lacking a C<.> root folder
need to be passed with a hash sign in front of the archive's name.
This may require to quote the parameter.)

To support zip files, a version of C<unzip> needs to be installed that is
compatible with the archive file.

B<The root folder switch using the hash sign is experimental and
may vanish in future versions.>

=item B<--output|-o> <directory|file>

Output folder for archive processing or
document name for single output (optional),
writes to C<STDOUT> by default
(in case C<output> is not mandatory due to further options).

=item B<--overwrite|-w>

Overwrite files that already exist.

=item B<--token|-t> <foundry>#<file>

Define the default tokenization by specifying
the name of the foundry and optionally the name
of the layer-file. Defaults to C<OpenNLP#tokens>.


=item B<--base-sentences|-bs> <foundry>#<layer>

Define the layer for base sentences.
If given, this will be used instead of using C<Base#Sentences>.
Currently C<DeReKo#Structure> is the only additional layer supported.

 Defaults to unset.


=item B<--base-paragraphs|-bp> <foundry>#<layer>

Define the layer for base paragraphs.
If given, this will be used instead of using C<Base#Paragraphs>.
Currently C<DeReKo#Structure> is the only additional layer supported.

 Defaults to unset.


=item B<--base-pagebreaks|-bpb> <foundry>#<layer>

Define the layer for base pagebreaks.
Currently C<DeReKo#Structure> is the only layer supported.

 Defaults to unset.


=item B<--skip|-s> <foundry>[#<layer>]

Skip specific annotations by specifying the foundry
(and optionally the layer with a C<#>-prefix),
e.g. C<Mate> or C<Mate#Morpho>. Alternatively you can skip C<#ALL>.
Can be set multiple times.

=item B<--anno|-a> <foundry>#<layer>

Convert specific annotations by specifying the foundry
(and optionally the layer with a C<#>-prefix),
e.g. C<Mate> or C<Mate#Morpho>.
Can be set multiple times.

=item B<--primary|-p>

Output primary data or not. Defaults to C<true>.
Can be flagged using C<--no-primary> as well.
This is I<deprecated>.

=item B<--jobs|-j>

Define the number of concurrent jobs in seperated forks
for archive processing.
Defaults to C<0> (everything runs in a single process).
Pass -1, and the value will be set automatically to 5
times the number of available cores.
This is I<experimental>.

=item B<--meta|-m>

Define the metadata parser to use. Defaults to C<I5>.
Metadata parsers can be defined in the C<KorAP::XML::Meta> namespace.
This is I<experimental>.

=item B<--pretty|-y>

Pretty print JSON output. Defaults to C<false>.
This is I<deprecated>.

=item B<--gzip|-z>

Compress the output.
Expects a defined C<output> file in single processing.

=item B<--cache|-c>

File to mmap a cache (using L<Cache::FastMmap>).
Defaults to C<korapxml2krill.cache> in the calling directory.

=item B<--cache-size|-cs>

Size of the cache. Defaults to C<50m>.

=item B<--cache-init|-ci>

Initialize cache file.
Can be flagged using C<--no-cache-init> as well.
Defaults to C<true>.

=item B<--cache-delete|-cd>

Delete cache file after processing.
Can be flagged using C<--no-cache-delete> as well.
Defaults to C<true>.

=item B<--sigle|-sg>

Extract the given texts.
Can be set multiple times.
I<Currently only supported on C<extract>.>
Sigles have the structure C<Corpus>/C<Document>/C<Text>.
In case the C<Text> path is omitted, the whole document will be extracted.
On the document level, the postfix wildcard C<*> is supported.

=item B<--log|-l>

The L<Log4perl> log level, defaults to C<ERROR>.

=item B<--help|-h>

Print this document.

=item B<--version|-v>

Print version information.

=back

=head1 ANNOTATION SUPPORT

L<KorAP::XML::Krill> has built-in importer for some annotation foundries and layers
developed in the KorAP project that are part of the KorAP preprocessing pipeline.
The base foundry with paragraphs, sentences, and the text element are mandatory for
L<Krill|https://github.com/KorAP/Krill>.

  Base
    #Paragraphs
    #Sentences

  Connexor
    #Morpho
    #Phrase
    #Sentences
    #Syntax

  CoreNLP
    #Constituency
    #Morpho
    #NamedEntities
    #Sentences

  DeReKo
    #Structure

  DRuKoLa
    #Morpho

  Glemm
    #Morpho

  Malt
    #Dependency

  MarMoT
    #Morpho

  Mate
    #Dependency
    #Morpho

  MDParser
    #Dependency

  OpenNLP
    #Morpho
    #Sentences

  Sgbr
    #Lemma
    #Morpho

  TreeTagger
    #Morpho
    #Sentences

  XIP
    #Constituency
    #Morpho
    #Sentences


More importers are in preparation.
New annotation importers can be defined in the C<KorAP::XML::Annotation> namespace.
See the built-in annotation importers as examples.

=head1 AVAILABILITY

  https://github.com/KorAP/KorAP-XML-Krill


=head1 COPYRIGHT AND LICENSE

Copyright (C) 2015-2017, L<IDS Mannheim|http://www.ids-mannheim.de/>

Author: L<Nils Diewald|http://nils-diewald.de/>
Contributor: Eliza Margaretha

L<KorAP::XML::Krill> is developed as part of the L<KorAP|http://korap.ids-mannheim.de/>
Corpus Analysis Platform at the
L<Institute for the German Language (IDS)|http://ids-mannheim.de/>,
member of the
L<Leibniz-Gemeinschaft|http://www.leibniz-gemeinschaft.de/en/about-us/leibniz-competition/projekte-2011/2011-funding-line-2/>.

This program is free software published under the
L<BSD-2 License|https://raw.githubusercontent.com/KorAP/KorAP-XML-Krill/master/LICENSE>.

=cut