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# Summary UD_Bulgarian-BTB is based on the HPSG-based BulTreeBank, created at the Institute of Information and Communication Technologies, Bulgarian Academy of Sciences. The original consists of 215,000 tokens (over 15,000 sentences). All the texts were processed automatically at tokenization, morphological and chunk level. Then, the full syntactic analysis were perfomed manually by trained annotators. # Introduction The UD_Bulgarian-BTB consists of 156 149 tokens (11,138 sentences). This subset of BulTreeBank excludes ellipses and some rare phenomena. The conversion was done semi-automatically by Kiril Simov, with the application of set of rules and constraints for result consistency. The rest of the sentences will be converted for the next releases. The original version is freely available for research upon request. # Acknowledgements The original treebank was developed in a project (2001-2004), funded by the Volkswagen Stiftung, Federal Republic of Germany under the Programme "Cooperation with Natural and Engineering Scientists in Central and Eastern Europe". The project was carried out mainly at IICT-BAS in tight cooperation with researchers at the Seminar für Sprachwissenschaft (SfS), Eberhard-Karls-Universität, Tübingen, Germany. Link: http://bultreebank.org/ The conversion of BulTreeBank into Universal Dependency format was supported by the EU Project QTLeap. Link: http://qtleap.eu/ We would like to thank all our colleagues that contributed to the annotation of the original treebank: Elisaveta Balabanova, Dimitar Dojkov, Maggie Ivanchukova, Sia Kolkovska, Milena Slavcheva, Petya Osenova. We also would like to thank our annotator and validator to the treebank UD version: Stanislava Kancheva. # References Petya Osenova and Kiril Simov. BTB-TR05: BulTreeBank Stylebook. BulTreeBank Project Technical Report № 05. 2004. Link: http://www.bultreebank.org/TechRep/BTB-TR05.pdf Kiril Simov and Petya Osenova. Practical Annotation Scheme for an HPSG Treebank of Bulgarian. In: Proc. of the 4th International Workshop on Linguistically Interpreteted Corpora (LINC-2003), Budapest, Hungary. 2003. Kiril Simov, Gergana Popova, Petya Osenova. HPSG-based syntactic treebank of Bulgarian (BulTreeBank). In: "A Rainbow of Corpora: Corpus Linguistics and the Languages of the World", edited by Andrew Wilson, Paul Rayson, and Tony McEnery; Lincom-Europa, Munich 2002, pp. 135-142. Kiril Simov, Petya Osenova and Milena Slavcheva. BTB-TR03: BulTreeBank Morphosyntactic Tagset. BulTreeBank Project Technical Report № 03. 2004 Kiril Simov, Petya Osenova, Alexander Simov, Milen Kouylekov. Design and Implementation of the Bulgarian HPSG-based Treebank. In Erhard Hinrichs and Kiril Simov, editors, Journal of Research on Language and Computation, Special Issue, Kluwer Academic Publishers, pp. 495-522. # Domains and data split The domains in the treebanks are as follows: Bulgarian newspapers (81 %), fiction (16 %) and administrative documents (3 %). The files of the original treebank were concatenated in one file. Then: - each tenth sentence was selected for the development set - each first sentence was selected for the test part - the rest sentences are in the training set Remark: Each tenth sentence means the following: when the ID of the sentence is divided by 10, the reminder is 0. Each first sentence means the following: when the ID of the sentence is divided by 10, the reminder is 1. Changelog --------- * 2018-04-15 v2.2 * Repository renamed from UD_Bulgarian to UD_Bulgarian-BTB. 1.4 -> 2.0 - manual improvements of the annotation (e.g. more features converted from the original treebank) - automatic conversion to UDv2 guidelines using Udapi (http://udapi.github.io/) ud.Convert1to2 - original texts added, extra PUNCT nodes after abbreviations deleted (ud.bg.RemoveDotAfterAbbr) - goeswith nodes added to match better the original texts (ud.GoeswithFromText keep_lemma=1) - sent_id now encodes both the original document and sentence number, # newdoc added - test set omitted from the UDv2.0 official release because of CoNLL 2017 shared task. 1.3 -> 1.4 - corrections with the use of copula relation: it was extended and applied to sentences that consist of the auxiliary verb ‘to be’, a noun and a subordinate sentence. In this case noun is the root, auxiliary verb is the dependent, attached with a cop relation, and the subordinate sentence is the subject. - extended use of the xcomp relation– after certain verbs and in the cases when there are: direct object and a subordinate sentence that is a complement, namely - xcomp; - extended use of the nsubjpass relation. 1.2 -> 1.3 - appositions (the wrongly annotated vocatives and appositions were corrected as nmod) - xcomp (the ccomp relations were checked for control structures and re-annotated as xcomp) - nsubjpass and csubjpass in se-passives were annotated - cop relation direction was corrected - the relation between nouns and short possessive pronouns was re-annotated from case to det - changed the feature VerbForm=Fin to VerbForm=Part for participles - We also have changed the feature VerbForm=Fin to VerbForm=Part for participles. 1.1 -> 1.2 - Addition of new data - Adding se-passives - Correcting dobj and iobj instead of expletive in the cases when there is no doubling. - Correcting the secondary predicates were re-considered from dobj to xcomp (Te ya naznachiha direktor.) - Adding auxpass relation <pre> === Machine-readable metadata (DO NOT REMOVE!) ================================ Data available since: UD v1.1 License: CC BY-NC-SA 3.0 Includes text: yes Genre: news legal fiction misc Lemmas: converted from manual UPOS: converted from manual XPOS: manual native Features: converted from manual Relations: converted from manual Contributors: Simov, Kiril; Osenova, Petya; Popel, Martin Contributing: elsewhere Contact: email@example.com, firstname.lastname@example.org =============================================================================== </pre>