Abstract
Nowadays, RDF data becomes more and more popular on the Web due to the advances of the Semantic Web and the Linked Open Data initiatives. Several works are focused on transforming relational databases to RDF by storing related data in N-Triple serialization format. However, these approaches do not take into account the existing normalization of their databases since N-Triple format allows data redundancy and does not control any normalization by itself. Moreover, the mostly used and recommended serialization formats, such as RDF/XML, Turtle, and HDT, have either high human-readability but waste storage capacity, or focus further on storage capacities while providing low human-readability. To overcome these limitations, we propose here a new serialization format, called S-RDF. By considering the structure (graph) and values of the RDF data separately, S-RDF reduces the duplicity of values by using unique identifiers. Results show an important improvement over the existing serialization formats in terms of storage (up to 71,66% w.r.t. N-Triples) and human readability.
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Notes
- 1.
Document Type Definition (DTD) defines the structure and the legal elements and attributes of an XML document.
- 2.
Centrality identifies the most related nodes within a graph, which have a high number of relations.
- 3.
It is one of the four normalization forms, which consists on a Canonical Decomposition, followed by a Canonical Composition -http://www.unicode.org/reports/tr15/.
- 4.
S-RDF: http://rdf-sequence.sigappfr.org.
- 5.
Jena is a Java framework for building Semantic Web applications. It provides a extensive Java libraries for helping developers develop code that handles RDF, RDFS, RDFa, OWL and SPARQL in line with published W3C recommendations - https://jena.apache.org/about_jena/about.html.
- 6.
Information about persons extracted from the English and Germany Wikipedia, represented by the FOAF vocabulary - http://wiki.dbpedia.org/Downloads2015-10.
- 7.
Geographic coordinates extracted from Wikipedia - https://wiki.dbpedia.org/downloads-2016-10.
- 8.
Easy-Converte: http://www.easyrdf.org/converter.
- 9.
RDF-Translator: https://rdf-translator.appspot.com.
- 10.
The form is available here: https://forms.gle/DNMfsp5LL3nw1hW9A.
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Dongo, I., Chbeir, R. (2019). S-RDF: A New RDF Serialization Format for Better Storage Without Losing Human Readability. In: Panetto, H., Debruyne, C., Hepp, M., Lewis, D., Ardagna, C., Meersman, R. (eds) On the Move to Meaningful Internet Systems: OTM 2019 Conferences. OTM 2019. Lecture Notes in Computer Science(), vol 11877. Springer, Cham. https://doi.org/10.1007/978-3-030-33246-4_16
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