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Table Of Contents
NoSQL Data Models
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In this section, we provide basic definitions on the interplay between RDF and its multigraph representation. Later, we explain how the task of answering SPARQL queries can be reduced to a multigraph homomorphism problem.
According to the W3C standards3, RDF data are represented as a set of triples <S,P,O>, as shown in Figure 5.1(a), where each triple <s,p,o> consists of the following three components: a subject, a predicate and an object. Further, each component of the RDF triple can be either of the two forms: an IRI (Internationalized Resource Identifier) or a literal. For brevity, an IRI is usually written with a prefix (e.g. <http://dbpedia.org/resource/isPartOf> is written as “x:isPartOf”), whereas a literal is always written with double quotes (e.g. “90000”). While a subject s and a predicate p are always an IRI, an object o can be either an IRI or a literal.
RDF data can also be represented...
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