Lingua::Interset - DZ Interset is a universal morphosyntactic feature set to which all tagsets of all corpora/languages can be mapped.
version 2.001
use Lingua::Interset qw(decode encode);
my $tag1 = 'NN'; # in the English Penn Treebank, "NN" means "noun"
my $feature_structure = decode('en::penn', $tag1);
print($feature_structure->as_string(), "\n");
$feature_structure->set_number('plu');
my $tag2 = encode('en::penn', $feature_structure);
print("$tag2\n");
DZ Interset is a universal framework for reading, writing, converting and interpreting part-of-speech and morphosyntactic tags from multiple tagsets of many different natural languages.
Individual tagsets are mapped to the Interset using specialized modules called tagset drivers. Every driver must implement three methods: decode, encode and list.
The main module, Lingua::Interset, provides parameterized access to the drivers and their methods. Instead of having to use particular modules (which would mean you know in advance what tagsets your program will be working with) you just specify the tagset giving its identifier as a parameter. Tagset ids are derived from Perl package names but they are always all-lowercase. Most tagsets are taylored for one language and their id has two components (separated by ::): the ISO 639 code of the language, and a part to distinguish various tagsets for the language. This second component may be some sort of abbreviated name of the corpus where the tagset is used, for example.
More information is given at the DZ Interset project page, https://wiki.ufal.ms.mff.cuni.cz/user:zeman:interset.
Takes tagset id and a tag in that tagset. Returns a Lingua::Interset::FeatureStructure object with corresponding feature values set.
Takes tagset id and a Lingua::Interset::FeatureStructure object. Returns the tag in the given tagset that corresponds to the feature values. Note that some features may be ignored because they cannot be represented in the given tagset.
Takes tagset id and returns the reference to the list of all known tags of that tagset. This is not directly needed to decode, encode or convert tags but it is very useful for testing and advanced operations over the tagset. Note however that many tagset drivers contain only an approximate list, created by collecting tag occurrences in some corpus.
Dan Zeman <zeman@ufal.mff.cuni.cz>
This software is copyright (c) 2014 by Univerzita Karlova v Praze (Charles University in Prague).
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.