SiR 1.0

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SiR 1.0
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Authors
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Barbora Hladká (Charles University, Faculty of Mathematics and Physics),
Jiří Mírovský (Charles University, Faculty of Mathematics and Physics),
Matyáš Kopp (Charles University, Faculty of Mathematics and Physics),
Václav Moravec (Charles University, Faculty of Social Sciences)

Introduction
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SiR 1.0 is an annotated corpus of Czech articles from a news server of a Czech
public radio iRozhlas (https://www.irozhlas.cz/). It is a collection of
1 718 articles (42 890 sentences, 614 995 words) with manually annotated
attribution.

For example, in the sentence
Jak už vědci uvedli při prvním kole vykopávek, jde pro ně o záhadu.
[As the scientists already stated during the first round of excavations,
it is a mystery to them.], the citation phrase uvedli [stated] refers to
the citation source vědci [scientists], who provided the information.

The sources are further classified into several classes of named (unofficial,
official non-political, official political) and unnamed (anonymous, partially
anonymous) sources.

The corpus consists of three parts, depending on the quality of the annotations:

(i) triple-annotated articles: 46 articles (933 sentences, 13 242 words)
annotated independently by three annotators and subsequently curated
by an arbiter,

(ii) double-annotated articles: 543 articles (12 347 sentences, 180 622 words)
annotated independently by two annotators and automatically unified, and

(iii) single-annotated articles: 1 129 articles (29 610 sentences,
421 131 words) annotated each only by a single annotator.

Data Format
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The data were annotated in the Brat tool (https://brat.nlplab.org/) and are
distributed in the Brat native format, i.e. each article is represented by
the original plain text and a stand-off annotation file. The annotation files carry
three types of information:

(i) annotation of citation phrases (text spans marked with tag "PHRASE"), 

(ii) annotation of citation so . . .