Learning SPARQL: Querying and Updating with SPARQL 1.1 by Bob DuCharme

By Bob DuCharme

Get hands-on event with SPARQL, the RDF question language that is turn into a key component to the semantic internet. With this concise booklet, you'll how to use the most recent model of this W3C average to retrieve and control the expanding volume of private and non-private info to be had through SPARQL endpoints. numerous open resource and advertisement instruments already aid SPARQL, and this creation will get you all started immediately. commence with tips on how to write and run uncomplicated SPARQL 1.1 queries, then dive into the language's robust good points and functions for manipulating the information you retrieve. examine what you must recognize so as to add to, replace, and delete facts in RDF datasets, and provides net functions entry to this knowledge.

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This name may not make it into new versions of data when the data is copied—for example, into the Rhizomik parser that created the diagram. Turtle and SPARQL sometimes use a pair of square braces ([]) instead of a prefixed name with an underscore prefix to represent a blank node. info Figure 2-2. Using a blank node to group together postal address data In the example, the _:b1 blank node is the object of one triple and the subject of several others. This is common, because RDF and SPARQL use blank nodes to connect things up.

You can also think of these as a resource identifier, an attribute or property name, and an attribute or property value. • To remove any ambiguity from the information stated by a given triple, the triple’s subject and predicate must be URIs. ) In this section, we’ll learn more about different ways to store and use RDF and how subjects and objects can be more than URIs representing specific resources or simple strings. Storing RDF in Files The technical term for saving RDF as a string of bytes that can be saved on a disk is serialization.

Com/ns/addressbook#> . org/1999/02/22-rdf-syntax-ns#> . org/2000/01/rdf-schema#> . ab:Musician rdf:type rdfs:Class ; rdfs:label "Musician" ; rdfs:comment "Someone who plays a musical instrument" . ab:MusicalInstrument a rdfs:Class ; rdfs:label "musical instrument" . ) There’s a lot more metadata that we can assign when we declare a class—for example, that it’s subclass of another one—but with just the metadata above we can see another very nice feature of RDFS. com/ns/addressbook#> . org/1999/02/22-rdf-syntax-ns#> .

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