A Semantic-Web based Framework for Developing Applications to Improve Accessibility in the WWW Michail Salampasis Dept. of Informatics TEI of Thessaloniki.

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Presentation transcript:

A Semantic-Web based Framework for Developing Applications to Improve Accessibility in the WWW Michail Salampasis Dept. of Informatics TEI of Thessaloniki

2 Aim of the research Improve usability of the WWW for blind people. Efficiency and effectiveness of information seeking process. Browsing strategies.

3 Problems of blind users in browsing the web Across document browsing. Not quick access to navigational aids. Scanning text for relevancy estimation.

4 Problems of blind users in browsing the web Within document browsing. Sight dependant functions. No use of visual cues such as colors, headlines, tables. (Misuse of HTML layout tags) Sight oriented web design (desktop metaphor and misuse of TABLE tag). Serialization as the main mechanism of adaptation.

5 Inspiring ideas Transcoding servers (Tagaki & Asawaka, Huang & Sundaresan) Semantic web A metadata layer build upon the current web. Use metadata to communicate missed information to blind users. Annotea project Community formation

6 Annotation Storage Server Knowledge Representation OWL ONAR Other ontology editors Semantic Annotation RDF Annotation tool Other Annotation Tools Knowledge Utilization (for accessibility problems solution) SeEBrowser Other agents using annotations Semantic-Web Based Framework The framework scheme

7 Knowledge Representation Ontology creators OWL Ontological approach Design freedom ONAR GUI for editing ontologies Collaborative design Knowledge Representation OWL ONAR Other ontology editors

8 Semantic Annotation Annotators RDF Basic standard of semantic web Extensibility through vocabularies Annotation tool Annotation storage server Use of HTTP User authorization Annotation Storage Server Semantic Annotation RDF Annotation tool Other Annotation Tools

9 Knowledge Utilization Agent developers End users SeEBrowser Voice web browser 2 level decomposition Shortcuts to annotated elements Faster access to content entry points Faster transition amongst page sections Knowledge Utilization (for accessibility problems solution) SeEBrowser Other agents using annotations

10 Framework community Annotators Agent developers & End Users Ontology Creators Annotations Vocabulary FeedbackFeedback

11 Is it realistic? Community commitment Open (based on RDF, OWL) Extensible (development of various vocabularies) Scalable (network of storage servers) Autonomous community (No need to be an expert in the standards if you have the right tools)

12 Preliminary evaluation results Frequent use of shortcuts functions Satisfaction by its use Bookmarks feature Notepad feature Difficulty in reading tables

13 Further research Vocabularies development and exploitation Automatic annotation Syntactic analysis Semantic analysis Other uses of annotations User profiles Semantic web usage mining

14 Conclusion There are many problems of accessibility on the current web and they will remain for even more… The framework uses the semantic web as a metadata layer upon the current web. It supports the development of a variety of software for the web. It supports and encourages the collaboration amongst people that care for accessibility problems.