12/28/2022 0 Comments Indexof typing master pro downloadIn ‘ Quantifying the use of COCI citation data’, we show the scale of community uptake of COCI since its launch by means of quantitative statistics on the use of its related services and by listing existing projects that are using it for specific purposes. In ‘ COCI: ingestion workflow, data, and services’, we present COCI, including the workflow process developed for ingesting and exposing the open citation data available, and other tools used for accessing these data. In ‘ Indexing citations as first-class data entities’, we provide some details on the rationale and the technologies used to describe citations as first-class data entities, which are the main foundations for the development of COCI. In ‘ Related works’ we introduce some of the main RDF datasets containing scholarly bibliographic metadata and citations. The rest of the paper is organized as follows. Currently COCI contains more than 445 million DOI-to-DOI citation links made available under a Creative Commons CC0 public domain waiver, that can be accessed and queried through a SPARQL endpoint (Harris and Seaborne 2013), an HTTP REST API, by means of searching/browsing Web interfaces, by bulk download in different formats (CSV and N-Triples), or by direct access via HTTP content negotiation. ![]() individuals of the class cito:Citation as defined in CiTO (Peroni and Shotton 2012)) instead of being defined simply as relations among two bibliographic resources (via the property cito:cites). This dataset, launched in July 2018, is the first of the indexes proposed by OpenCitations ( ), in which citations are exposed as first-class data entities with accompanying properties (i.e. In this paper, we introduce a new dataset made available a few months ago by OpenCitations, namely COCI, the OpenCitations Index of Crossref open DOI-to-DOI citations ( ). 2017) of open downloadable bibliographic and citation data recorded in RDF. 2014), and has previously developed the OpenCitations Corpus (OCC) (Peroni et al. It has created and maintains the SPAR (Semantic Publishing and Referencing) Ontologies ( ) (Peroni and Shotton 2018c) for encoding scholarly bibliographic and citation data in the resource description framework (RDF) (Cyganiak et al. OpenCitations ( ) (Peroni and Shotton 2019b) is a scholarly infrastructure organization dedicated to open scholarship and the publication of open bibliographic and citation data by the use of Semantic Web (Linked Data) technologies, and is a founding member of I4OC. The Initiative for Open Citations (I4OC, ) has dedicated the past 2 years to persuading publishers to provide open citation data by means of the Crossref platform ( ), obtaining the release of the reference lists of more than 43 million articles (as of February 2019), and it is this change of behaviour by the majority of academic publishers that has permitted COCI to be created. 2017)), quantitatively by creating citation-based metrics for evaluating the impact of an idea or a person (Schiermeier 2017), and ‘financially’ by defining the scholarly ‘value’ for a researcher within his/her own academic community (Molteni 2017). Citations not only serve as an acknowledgment medium (Newton 1675), but also can be characterised topologically (by defining the connection graph between citing and cited entities and its evolution over time (Chawla 2017)), sociologically (such as for identifying unusual conduct within or elitist access paths to scientific research (Sugimoto et al. The availability of open scholarly citations (Peroni and Shotton 2018a) is a public good, of significant value to the academic community and the general public. ![]() ![]() Finally, we present statistics regarding the use of COCI citation data, and we introduce several projects that have already started to use COCI data for different purposes. ![]() We introduce the workflow we have developed for creating these data, and also show the additional services that facilitate the access to and querying of these data via different access points: a SPARQL endpoint, a REST API, bulk downloads, Web interfaces, and direct access to the citations via HTTP content negotiation. These citations are described using the resource description framework by means of the newly extended version of the OpenCitations Data Model (OCDM). COCI is the first open citation index created by OpenCitations, in which we have applied the concept of citations as first-class data entities, and it contains more than 445 million DOI-to-DOI citation links derived from the data available in Crossref. In this paper, we present COCI, the OpenCitations Index of Crossref open DOI-to-DOI citations ( ).
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