1. Bulgarian WordNet Svetla Koeva Institute for Bulgarian Language
Bulgarian Academy of Sciences

2. Second Wordnet Conference, Brno
Bulgarian WordNet
The Bulgarian WordNet (BulNet) has been under development for two years within the framework of the BalkaNet project.
The BalkaNet project (Multilingual Semantic Network for the Balkan Languages), aims to develop a multilingual resource representing semantic relationships in five Balkan languages (Bulgarian, Greek, Serbian, Romanian and Turkish).
Each set of synonymous words in a given language is linked to the closest set in the Princeton WordNet2.0 via its ID number.
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Second Wordnet Conference, Brno

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BulNet – DCMB team
The partners from Bulgarian site are Bulgarian Academy of Sciences and Plovdiv University.
The Bulgarian WordNet is being developed by the Department of Computer Modeling of Bulgarian Language within the Institute for Bulgarian language - Bulgarian Academy of Sciences
The DCMB BulNet team consists of small group of researchers – linguists, computational linguists, logicians and mathematicians.
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Second Wordnet Conference, Brno

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BulNet – current state
The Bulgarian WordNet models nouns, verbs, and adjectives, and contains already word senses (towards ), where literals have been included (the ratio is 1.8).
The distribution of synsets into parts of speech:
Nouns – synsets
Verbs – synsets
Adjectives – synsets
Adverbs – 4 synsets
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Second Wordnet Conference, Brno

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BulNet – current state
Hypernym –
Near_antonym – 1371
Holo_part – 989
Holo_member – 798
Derived – 778
Verb_group – 710
Also_see – 187
Subevent – 149
Be_in_state – 386
Cause – 105
Holo_portion – 63
Similar_to – 49
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Second Wordnet Conference, Brno

6. Second Wordnet Conference, Brno
Completeness
Presence of all members from the chosen up to now Base Concepts within the framework of the BalkaNet project.
Base Concepts 1 (1218 members)
BC2 (3471 members)
BC3 (4855 members)
Lack of any "dangling relations"
Lack of any “gaps”
Presence of an appropriate interpretation definition for each synset
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Second Wordnet Conference, Brno

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Consistency
The are no duplicated literals in a given synset.
There are no identical or almost identical glosses of different synsets.
There are no literals that coincide with their glosses.
There are no duplicated relations between two synsets.
Every difference in relations according to EWN is language specific and linguistically grounded.
There are no hypernym cycles, as well as any relation loops inside BulNet.
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Second Wordnet Conference, Brno

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Main achievements
Theoretical linguistic work
Validation tests
Dependencies between relations
Combination of Bulgarian language resources
Descriptive logic
Design and development of tools
WordNet Explorer
WordNet Validator
2 December 2018
Second Wordnet Conference, Brno

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Validation tests
Our approach to validation of WordNets includes three separate levels:
Checking the syntax of the XML files
Completeness checking of WordNets
Checking for consistency in defining the semantic relations and glosses.
Every level is distinguished with:
Different degrees of complexity and significance
Different possibilities for automatic data correction
2 December 2018
Second Wordnet Conference, Brno

10. Second Wordnet Conference, Brno
Validation tests
The lowest level, which is also the easiest for processing and correction, is XML fails syntax.
In the following cases automatic checking as well as automatic data correction is possible:
Facultative empty tags
Duplicated literals in a synset
Sense numbers
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Second Wordnet Conference, Brno

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Validation tests
In other cases where automatic correction is possible manual confirmation of replacements is necessary:
Accepted ID standard
Missing values of the obligatory tags
Corespondence of BCS tags
At least one literal in a synset
2 December 2018
Second Wordnet Conference, Brno

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Validation tests
In some cases only validation is possible:
No duplicated <ID> numbers
No duplicated relations between two synsets
No “gaps”
No “dangling relations”
No loops
2 December 2018
Second Wordnet Conference, Brno

13. Relations’ dependencies
Description of the dependencies between the relations:
Hyponyms of two antonyms (nouns) should also be antonyms (woman – man; female actor – actor)
Antonyms (nouns) should have equivalent holo_parts: woman - arm, head; man – arm, head.
Hyponym should have the same mero_parts (for concrete nouns} as its hypernym (man – head, arm,… ; woman – head, arm, ..)
Collective nouns that are holo/mero_members should share the same hypernym, not necessarily the immediate one (football team is an organization, as well as football league)
Nouns that are holo/mero_portions should share the same hypernym, not necessarily the immediate one (coffee – substance; caffeine - substance)
2 December 2018
Second Wordnet Conference, Brno

14. Combining language resources
Three large Bulgarian resources:
BulNet
Bulgarian Syntax Dictionary – encoding the arguments of the verbs and their semantic features
Bulgarian Grammatical Dictionary – encoding over lemmas are their corresponding word forms
Mutual supplement
Expansion of the resources
Validation of the resources
Uniform grammatical characteristics
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Second Wordnet Conference, Brno

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WordNet logic
The DCMB team developed a uniform, efficient and powerful utility system for querying and exploring of WordNet – WordNet logic.
Tailored for the WordNet developers needs
Powerful enough for expressing complex statements and queries
Fully decidable
The formal background consists of WordNet Structure, WN Language, WN Semantics,WN Logic and WN Logic theorems.
Tinko Tinchev, Stoyan Mihov, Svetla Koeva, Angel Genov: Logic for WordNet, Annual Journal of Sofia University, 2003
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Second Wordnet Conference, Brno

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WordNet Validator
The WordNet Validator (WNV) is a Web-based system for validation (and correction) of WordNets completeness and consistency
The WordNet Validator has the following main functions: automatic correction of xml syntax, validation of WordNet completeness and consistency, search for a given synset and visualization of semantic trees.
The WordNet Validator can be used for practical work during constructing monolingual WordNets of Balkan languages as well as for evaluation of the completeness and consistency of different WordNet.
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Second Wordnet Conference, Brno

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Second Wordnet Conference, Brno

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Second Wordnet Conference, Brno

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Future directions
2 December 2018
Second Wordnet Conference, Brno