Mastering Structured Data on the Semantic Web: From HTML5 by Leslie F. Sikos
By Leslie F. Sikos
A tremendous issue of traditional sites is their unorganized and remoted contents, that's created often for human intake. This issue should be addressed through organizing and publishing info, utilizing robust codecs that upload constitution and aspiring to the content material of websites and hyperlink comparable info to each other. pcs can "understand" such info greater, which are worthwhile for activity automation. the net websites that offer semantics (meaning) to software program brokers shape the Semantic internet, the bogus Intelligence extension of the area vast net. unlike the normal internet (the "Web of Documents"), the Semantic internet comprises the "Web of Data", which connects "things" (representing real-world people and items) instead of files meaningless to desktops. getting to know dependent information at the Semantic net explains the sensible facets and the speculation in the back of the Semantic net and the way established info, similar to HTML5 Microdata and JSON-LD, can be utilized to enhance your site’s functionality on next-generation seek Engine outcome Pages and be displayed on Google wisdom Panels. you'll easy methods to signify arbitrary fields of human wisdom in a machine-interpretable shape utilizing the source Description Framework (RDF), the cornerstone of the Semantic net. you will find the way to shop and control RDF facts in purpose-built graph databases similar to triplestores and quadstores, which are exploited in online marketing, social media, and knowledge mining, within the kind of colossal information functions akin to the Google wisdom Graph, Wikidata, or Facebook’s Social Graph.
With the regularly expanding person expectancies in net companies and purposes, Semantic internet criteria achieve extra reputation. This e-book will familiarize you with the top managed vocabularies and ontologies and clarify tips on how to characterize your individual recommendations. After studying the foundations of associated info, the five-star deployment scheme, and the Open facts suggestion, it is possible for you to to create and interlink five-star associated Open facts, and merge your RDF graphs to the LOD Cloud. The ebook additionally covers an important instruments for producing, storing, extracting, and visualizing RDF information, together with, yet no longer restricted to, Protégé, TopBraid Composer, Sindice, Apache Marmotta, Callimachus, and Tabulator. you'll learn how to enforce Apache Jena and Sesame in well known IDEs reminiscent of Eclipse and NetBeans, and use those APIs for fast Semantic internet program improvement. getting to know dependent facts at the Semantic internet demonstrates how one can characterize and fasten based info to arrive a much wider viewers, motivate information reuse, and supply content material that may be immediately processed with complete walk in the park. hence, your internet contents can be critical components of the following revolution of the Web.
What you’ll learn
expand your markup with machine-readable annotations and get your information to the Google wisdom Graph
characterize real-world gadgets and people with machine-interpretable code
improve Semantic internet functions in Java
Reuse and interlink based information and create LOD datasets
Who this ebook is for
The e-book is meant for net builders and search engine marketing specialists who are looking to examine cutting-edge web optimization tools utilizing machine-readable annotations and machine-interpretable associated info definitions. The publication also will profit researchers drawn to automated wisdom discovery. As a textbook on Semantic internet criteria powered through graph conception and mathematical good judgment, the ebook may be used as a reference paintings for desktop technology graduates and Semantic internet researchers.
Table of Contents
1. advent to the Semantic Web
2. wisdom Representation
3. associated Open Data
4. Semantic net improvement Tools
5. Semantic internet Services
6. Graph Databases
8. great facts Applications
9. Use instances
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Additional resources for Mastering Structured Data on the Semantic Web: From HTML5 Microdata to Linked Open Data
Listing 2-27. 0/">Creative Commons By-NC-ND License. When a predicate is expressed using rel, the href or src attribute is used on the element of the RDFa statement, to identify the object (see Listing 2-28). Listing 2-28. com" /> Web address (Uniform Resource Identifier, URI), internationalized web address (Internationalized Resource Identifier, IRI), or compact web address (Compact URI, CURIE) 5 34 Chapter 2 ■ Knowledge Representation Reverse relationships between two resources (predicates) can be expressed with the rev attribute.
In OWL-DL, RDF can be used only for expressing OWL axioms. OWL-DL implements the model-theoretic semantics of SROIQ(D) called OWL2 Direct Semantics. • OWL-Lite: A subset of OWL-DL designed for easy implementation. OWL-Lite has limited applicability, because it is suitable only for classification hierarchy and simple constraints. Chapter 2 ■ Knowledge Representation OWL2 provides the expressiveness of the SROIQ(D) Description Logic; OWL-DL is based on the SHOIN(D) Description Logic; while OWL-Lite is based on the SHIF(D) Description Logic.
For XHTML documents that contain microformats, the profile specific to the applied annotations is used. For example, an XHTML document that supports GRDDL and has hCard information has a profile like that shown in Listing 2-39. Listing 2-39. org/2006/03/hcard"> GRDDL agents can extract all the hCard data from pages that reference the link of profile transformation (Listing 2-40). Listing 2-40. com/hcard/">this hCard. 39 Chapter 2 ■ Knowledge Representation R2RML: Relational Databases to RDF The majority of dynamic web site contents are powered by relational databases (RDB) such as Microsoft SQL, MySQL, Oracle, IBM DB2, or PostgreSQL.