Model

The metadata model used for the data stored in the OpenCitations Corpus and in the OpenCitations Indexes is briefly summarised in Figure 1 and is described in:

Silvio Peroni, David Shotton (2016). The OpenCitations Data Model. Figshare. https://doi.org/10.6084/m9.figshare.3443876

The model is explicitly aligned with the SPAR Ontologies and other well-known vocabularies, including:

For convenience, all the terms from the aforementioned ontologies are collected within a new ontology called OpenCitations Ontology (OCO). This is not yet another bibliographic ontology, but rather just a place where existing complementary ontological entities from several other ontologies are grouped together for the purpose of providing descriptive metadata for the OCC.

The Graffoo diagram of the main ontological entities described by the OCC metadata model.

Figure 1. The Graffoo diagram of the main ontological entities described by the OCC metadata model.

OpenCitations Indexes sub-module

The RDF statements in each of the OpenCitations Indexes are organising according to the data model shown in Figure 2.

The Graffoo diagram of the data model adopted by all the OpenCitations Indexes.

Figure 2. The Graffoo diagram of the data model adopted by all the OpenCitations Indexes.

This model is based on the Citation Typing Ontology (CiTO) for describing the data, and the Provenance Ontology (PROV-O) for the provenance information.