September 2010
Intermediate to advanced
446 pages
13h 23m
English
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Chapter 10. Semantics
WHEN BUILDING DISTRIBUTED APPLICATIONS ON THE WEB, you’ll see one thing is clear: document formats matter. The meaning, or semantics, behind the data and information in a document must be understood by both parties in an interaction in order to successfully achieve a business goal.
This chapter explores some of the possibilities raised by the advent of semantic technologies. It focuses on data, information, and the technologies that have emerged to help in integration scenarios. Semantics and Semantic Web are popular terms; here we show how they apply both to the example of Restbucks and more generally to building distributed systems on the Web. We’ll also briefly explore some popular technologies from the Semantic Web, including RDF and SPARQL.
Syntax Versus Semantics
Most distributed computing models enforce the structural or
syntactic correctness of a system’s APIs and
messages using interface or contract definition languages and message schemas. The
semantics of these structural elements, however, is usually communicated
through some other mechanism—typically a natural language specification.
From a syntactic point of view, a <cost>2.0</cost> element is as
good as an <a11119eb>2.0</a11119eb> element, just so long as both conform to the schema defined by the service provider. The difference is that the former is immediately meaningful to a human developer of an application, whereas the latter requires some interpretation—most likely involving reading a specification ...
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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.
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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.