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Abstract
By tailoring content access, presentation, and functionality to the user's location, device, personal preferences, and needs, Web Information Systems (WISs) have become increasingly user and context-dependent. In order to realize such adaptive behavior, Web engineers are thus faced with an additional challenge: engineering the required adaptation concerns. In this article, we present, in the context of a WIS design method, an adaptation engineering process that is separated from the regular Web design process. Our approach is based on the use of two key elements: (1) aspect-oriented techniques to achieve the separation of (adaptation) concerns; and (2) the exploitation of semantic information and metadata associated with the content, for enhanced expressivity and flexibility. By combining these key elements, we demonstrate a robust, rich, consistent, and flexible way to specify adaptation in WISs.
Notes
1. See http://www.w3.org/
3. See http://rdf.dmoz.org/
6. E.g. http://www.swoogle.com/
7. E.g. http://dbpedia.org/
8. Citing recent publications describing the current state of the respective WIS design methods.
9. It should be noted that this was done by researchers external to the WebML team.
10. SeRQL can be easily exchanged for SPARQL, the W3C RDF query standard.
13. More specifically, a datatype property of the concept that corresponds to the Unit in which the attribute appears.
14. In fact, this is syntactic sugar for “type unit or type subunit” which we'll see further on.
15. In SEAL, square brackets are used to enclose queries over the DM.
16. i.e. obtained by executing the SeRQL query underlying the AM element.
17. Note that we actually also need to hide relationships pointing to age-restricted information, instead of only sub-units showing it. We have omitted relationships from the current example for clarity, but the desired behavior could be easily achieved by adding, in disjunction, an expression in the pointcut to also select these relationships (similar to the one selecting sub-units).
19. Java Compiler Compiler [tm] (JavaCC [tm]) – The Java Parser Generator. http://javacc.dev.java.net/
20. Note that our implementation here currently relies on SeRQL to modify RDF repositories. However, with update extensions to SPARQL becoming available, the latter would be equally usable.
21. As aspects operate on AM level, they do not interfere with HTML generation. Hence we excluded this process from our measurements.