DB Triplestore

Triplestore

• Triple; subject, predicate, object SPO
• Graphs; directed knowledge graph
• RDF; triple data format, metadata model,
• NoSQL, schema agnostic, explicite relations, RDF specific, inference, reasoning, semantic queries,

Graph based storage a set of subjects and object which are a network of interconnected nodes as connected by predicate edges. Triplestore is a special case of graphstore specifically for RDF.

Triplestore database

• RDF4J WP (formerly OpenRDF Sesame), Java, Eclipse
• CubicWeb, Python
• Jena, WP WS Java, open source, ASF
• Mulgara,
• Blazegraph,
• Exist-db, open source, rdf, rdfs, owl, xml, sparql 1.1 most of,
• dbpedia, WS, dbpedia is built on Virtuoso,
• Virtuoso Universal Server, WP, free and open source version OpenLink Virtuoso,

Tools

• ViziQuer, SPARQL queries on SPRAQL end points

Terms

• Big Data
• Linked Data
• Ontology
• Ontology alignment, WP see SKOS, also ontology mapping for mono-lingual and cross-lingual,
• Semantic Web

Technology - linked data universe

• Content Negotiation by Profile, W3C WS
• JSON, WP
• JSON-LD, WP
• HTTP, IETF, WP
• International Resource Identifier IRI, IETF, WP, WS
• Linked Data Platform LDP, W3C WS
• Notation 3 N3 WP, WS non XML serialisation of represetation of RDF models,
• OWL Family, W3C, WP, WS, semantic extension to RDF, meaning over RDF
• Resource Description Framework (RDF), W3C, WP, WS
• RDF Schema RDFS, W3C, WP,
• Rule Interchange Format RIF, W3C, WP, RIF run time, PRR model time, equivalencies to OMG's Production Rule Representation (PRR) for modelling in UML
• Shapes Contraint Language SHACL, W3C, WP, WS, RDF shapes graphs, validation of RDF data graphs,
• SKOS, W3C, WP, WS
• URI, IETF, WP
• CURIE, W3C, WS, Compact URI, short from URI's,
• vcard, W3C, WS, contact details in rdf,

<todo: investigate further>

• Commons RDF, WS still current?
• Apache Commons RDF
• Apache Clerezza
• Apache Marmotta
• Apache Stanbol
• SPARQL-MM
• ...

Query languages

• GeoSPARQL, WP, geo spacial linked data, ontology, geo spacial RDF data exchange,
• SPARQL, W3C, WP WS RDF query language for triplestore, semantic querying, supports inference as first class feature, widely adopted standard
• SQL, rdbms, not for RDF tripplestore db or graph db, very mature standard, SPARQL query to SQL tools
• XQuery, SPARQL query to xquery tools

Query API

• NGSI-LD, ETSI, context information, IIOT, IOT, SoS, technology base; RDF, RDFS, OWL, JSON, JSON-LD, HTTP, URI, IRI,
• GeoJSON data serialization
• KML data serialization google

RDF libs - some or all of; graph manipulation, serialization, querying, reasoning, strorage

• RDFLib WP, WS, Python, server side, graph interface, store in memory & persistent, support for RDF/XML, N3, NTriples, N-Quads, Turtle, TriX, JSON-LD, HexTuples, RDFa, Microdata, db's consider BerkeleyDB, SQLite, MySQL, PostgreSQL, Virtuoso, Neo4J
• RDF Commons WP, WS, Java,
• EasyRDF WP, WS, PHP, server side,
• ApacheJena WP, WS, Java, server side, api, triple store, SPARQL,
• reflib.js WP, WS, JavaScript, client side, reasoner (inference reasoing)
• node-rdf WP, WS, , , data storage
• RDF-Ext WP, WS, , , data storage
• sparql-spin-js3 - , , parsing (Turtle, SPARQL, )

References

• Comparison of RDFJS libraries, W3C, WS

News Papers

• Understanding Linked Data Formats Turtle vs RDF/XML vs N-Triples vs JSON-LD, Oct 10, 2018, Angus Addlesee, Wallscope WS
• Tackling Big Data Challenges with Linked Data, Sep 5, 2018, Angus Addlesee, Wallscope, WS
• Difference between Virtuoso Native RDF Quad Store and Virtuoso SQL-Based RDF Triple Store, 2013, StackOverflow, WS