XHTML+RDFa (Extensible Hypertext Markup Language + Resource Description Framework in attributes) is an extended version of the XHTMLmarkup language for supporting RDF through a collection of attributes and processing rules in the form of well-formedXML documents. Web standardistas consider this combination as one of the most advanced markup codes available today.
XHTML+RDFa is one of the techniques used to develop Semantic Web content by embedding rich semantic markup.
Version 1.1 of the language is a superset of XHTML 1.1, integrating the attributes according to RDFa Core 1.1. In other words, it is an RDFa support through XHTML Modularization.
Conventional Web documents contain large amounts of structured data that can be rendered in web browsers. This approach works fine for publishing purposes, however, a large amount of data stored in Web documents cannot be processed this way. XHTML+RDFa can provide machine-readablemetadata within the markup code which makes additional user functionalities available. Most important of all, actions can be performed automatically that enables up-to-date publishing, structured search and sharing.
RDFa can serve as a bridge between the "human and data webs".
The potential in web documents enriched with RDFa is increasing since major search engines begin to process them while indexing. Yahoo indexes RDFa and microformats since 2008 and Google since 2009.
The RDFa attribute specifications make it possible to describe structured data in any markup language. The RDFa markup in XHTML+RDFa reuses the markup code, thus eliminating the need for unnecessary duplications.
XHTML+RDFa is not widely distributed yet, probably due to the lack of support in authoring tools and content management systems. However, there is good tendency. Drupal 7, for example, supports RDFa.
Since the “a” in RDFa stands for attributes, it is straightforward to use CSS selectors to style the code.
Document Type Definition
The combination of XHTML 1.1 and RDFa modules is claimed to be an example markup language. The Document Type Definition is published at the W3C website.
According to the document type declaration, the identifiers of an XHTML+RDFa document should look like the following:
In order to conform XML syntax, this document type declaration can only appear after the optional XML declaration, and before the document body, i.e.
XHTML+RDFa document example
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Authoring
The RDFametadata is embedded as an XHTML attribute of the document element, generally the XHTML tag. The annotation syntax provided by RDFa can be used to express RDF statements in XHTML documents.
Google Tech Talks May, 23 2008 ABSTRACT Overview: Mark Birbeck has spent a number of years working on flexible user interfaces, both by developing software and working with the W3C on new standards. His latest work involves creating an Ajax framework that uses metadata embedded in HTML documents to drive dynamic user interfaces. The framework makes it easy for authors to build interactive sites, whilst still creating accessible, searchable documents. In this talk Mark will look at how embedded metadata can be used by anyone from scientific researchers to bloggers, through news organisations to photographers, to improve how their pages are understand and interacted with. Speaker: Mark Birbeck Mark Birbeck devised RDFa, a new standard from the W3C that allows metadata to be embedded in HTML and XHTML documents, rather than being stored separately. Web pages enriched in this way provide more accurate information for use in search engines, as well as creating enormous potential for building a new generation of interactive tools for the end-user. Mark is also involved in the XForms Working Group and the XHTML 2 Working Group, has contributed to books on XML and RDF, blogs regularly about XForms, the semantic web, and RIAs, and his company, webBackplane develops a range of open source software for semantic-driven user interfaces. His profile is at webBackplane.com
Beyond Web 2.0 -- How RDFa Can Help to Democratise Data on t
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Diplomová práce Václav Klaus 3 chyby a 82 varování
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validator.w3.cz Diplomová práce Václav Klaus 3 chyby a 82 varování validator.w3.cz Výsledek: Dokument neprošel validací, 3 chyby a 82 varování. Adresa: www.klaus.cz Typ z...
