Abstract
Web Content Accessibility Guideline (WCAG) proposed by Web Accessibility Initiative is the most recognized regulation in the world in evaluating the accessibility of web contents and is one of the W3Cdocumentations. Currently,the WCAG documents are maintained as a non-computable dictionary like resources. In this study, we proposed a methodology to develop an ontological knowledge base with rules for the WCAG 2.0. Two WCAG techniques in different groups of techniques are used to illustrate the creation of the knowledge base and their application programming interfaces. For demonstrating purpose, a web-based WCAG validation system is built. With the proposed knowledge base and interfaces, computer programs can decide whether certain web content satisfies a particular WCAG technique. In other words, the WCAG documents have been successfully trans-formed to a computable recourse. Such sharable knowledge base and programming interfaces can be embedded into any system requiring the WCAG knowledge.
Highlights
In order to improve the accessibility of web contents for people with particular disability, the WAI (Web Accessibility Initiative) had released guidelines called the Web Content Accessibility Guidelines, WCAG 1.0, as one of the W3C (World Wide Web Consortium) documentations since 5 May 1999
We presented a modeling method to translate the dictionary like documents to a computable knowledge base
We demonstrated how to translate WCAG test procedures to Semantic Web Rule Language (SWRL) rules
Summary
In order to improve the accessibility of web contents for people with particular disability, the WAI (Web Accessibility Initiative) had released guidelines called the Web Content Accessibility Guidelines, WCAG 1.0, as one of the W3C (World Wide Web Consortium) documentations since 5 May 1999. Since the knowledge base is a sharable resource, it can be embedded into software systems requiring the knowledge of WCAG 2.0 Developing such a WCAG KB is an expert intensive task that requires both ontology and WCAG. The software system called Free go is an example of a tool developed to verify the level of accessibility of web contents on WCAG 1.0 [9]. Since the WCAG 2.0 is much more complicated than version 1.0, sophisticated mechanisms such as ontological knowledge base systems may be more appropriate for developing tools for WCAG 2.0. A web-based WCAG validation system is built to illustrate the usage of the proposed KB and APIs. The rest of the paper is organized as follows: Section 2 reviews the background knowledge of this study including WCAG 2.0 and ontology technology.
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