July 2011
Beginner
252 pages
6h 37m
English
Content preview from Learning SPARQLBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Glossary
- binding
A pairing between a SPARQL variable and an RDF term. In practical terms, it’s a variable that has had a value assigned.
- bnode
See blank node.
- blank node
A subject or object in an RDF graph that has no identity. These are typically used to group together other values. For example, an address book entry may have an email address of “jsmith@example.com”, a phone number of 943-234-9664, and an address whose value is a blank node that has its own values: one for a street address, one for a city name, one for a postal code, and so forth. The resource that has these property values is represented by a prefixed name with an underscore prefix (for example,
_:xyz) or as a pair of square braces ([]).See Also graph, prefixed name.
- cast
To convert a piece of data from one datatype to another—for example, converting the string “123” to the integer 123 or “2011-10-14T13:19:00”^^xsd:dateTime to “2011-10-14T13:19:00”^^xsd:string. “Cast” is a common programming term and not specific to SPARQL.
- default graph
The triples in an RDF dataset that don’t belong to a named graph.
- Dublin Core
A popular vocabulary providing a basic set of metadata terms such as
title,creator, anddate. Many specialized metadata vocabularies are usually based on Dublin Core.See Also vocabulary.
- endpoint
See SPARQL endpoint.
- entailment
If A entails B, and A is true, then we know that B is true. If A is a complicated set of facts, it can be very handy to have technology such as an RDFS- or OWL-aware SPARQL processor to help ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.