By Shelley Powers
The source Description Framework (RDF) is a constitution for describing and interchanging metadata at the Web--anything from library catalogs and all over the world directories to bioinformatics, Mozilla inner info buildings, and information bases for synthetic intelligence initiatives. RDF offers a constant framework and syntax for describing and querying info, making it attainable to proportion web site descriptions extra simply. RDF's features, even if, have lengthy been shrouded by means of its recognition for complexity and a tricky family members of requisites. Practical RDF breaks via this attractiveness with rapid and solvable difficulties that can assist you comprehend, grasp, and enforce RDF solutions.
Practical RDF explains RDF from the floor up, delivering real-world examples and outlines of the way the know-how is getting used in purposes like Mozilla, FOAF, and Chandler, in addition to infrastructure you should use to construct your personal purposes. This publication cuts to the center of the W3C's usually vague requirements, providing you with instruments to use RDF effectively on your personal projects.
The first a part of the booklet makes a speciality of the RDF requisites. After an advent to RDF, the e-book covers the RDF specification records themselves, together with RDF Semantics and ideas and summary version necessities, RDF constructs, and the RDF Schema. the second one part specializes in programming language help, and the instruments and utilities that let builders to check, edit, parse, shop, and manage RDF/XML. next sections concentrate on RDF's info roots, programming and framework aid, and functional implementation and use of RDF and RDF/XML.
If you must understand how to use RDF to details processing, Practical RDF is for you. even if your pursuits lie in large-scale details aggregation and research or in smaller-scale initiatives like blog syndication, this ebook provides you with a superb beginning for operating with RDF.
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Additional resources for Practical RDF
By this I mean that every assertion made about one RDF graph can be made with equal truth about the other graph. For instance, statements made in one graph are implicitly made in the other; if you believe the statement in the first, you must, through entailment, believe the same statement in the other. , the original graph had two statements, while the subgraph had only one). Another lemma, instance lemma, states that all instances of a graph are entailed by the graph—instance in this case an implementation of a graph in which all blank nodes have been replaced by a literal or a uriref.
As you can see, the representation matches that shown in Figure 3-1— offering validation that the model syntax used does provide a correct representation of the statements being modeled. 32 | Chapter 3: The Basic Elements Within the RDF/XML Syntax This is the Title of the Book, eMatter Edition Copyright © 2007 O’Reilly & Associates, Inc. All rights reserved. 0/title Shelley Powers Architeuthis Dux Figure 3-2. RDF Validator–generated directed graph of Example 3-1 In Example 3-1, the objects are literal values.
The use of URIs and the concepts of namespaces and QNames are discussed in more detail in Chapter 3. RDF Serialization: N3 and N-Triples Though RDF/XML is the serialization technique used in the rest of this book, another serialization technique supported by many RDF applications and tools is NTriples. This format breaks an RDF graph into its separate triples, one on each line. Regardless of the shorthand technique used within RDF/XML, N-Triples generated from the same RDF graph always come out the same, making it an effective way of validating the processing of an RDF/XML document.
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