Web ml Explained
Download as PPTX, PDF0 likes467 views
This document discusses Web Modeling Language (WebML), which provides a visual notation and methodology for designing complex, data-intensive web applications. WebML uses five models - structural, derivation, composition, navigation, and presentation - to design different aspects of a website. It allows designers to graphically represent a site at a high level without implementation details. The models help express the site's content, hypertexts, page composition, navigation, and presentation.
Web ml Explained
- 1. Presenter : Waseem khan
- 2. Introduction Motivation Models Webml Operations Siteview
- 3. Web Modeling Language Visual notation and a methodology for designing complex data-intensive web applications Provides graphical embodied in a complete design process Can be assisted by visual design tools
- 4. Enables designers to express the core features of a site at a high level, without committing to detailed architectural details. Graphical representation is easily supportable by CASE tools. Effectively communicated to the non-technical members of the site development team also supports an XML syntax, which instead can be fed to software generators for automatically producing the implementation of a Web site
- 5. This method has five models ◦ Structural Model ◦ Derivation Model ◦ Composition Model ◦ Navigation Model ◦ Presentation Model
- 6. it expresses the data content of the site in terms of the relevant entities and relationships Compatible with classical notations like the E/R model, object-oriented model, and UML class diagrams Is-A hierarchy
- 7. describes one or more hypertexts that can be published in the site Each different hypertext defines a so-called site view Site view descriptions in turn consist of two sub-models. ◦ Derivational Model ◦ Composition Model
- 8. it specifies which pages compose the hypertext, and which content units make up a page. E.g.: – BestSeller := Book where Book.Sales > 50,000 – Author.BooksNumber = count(self.Author2Book)
- 9. it expresses how pages and content units are linked to form the hypertext Links are either non-contextual, when they connect semantically independent pages
- 10. Units and pages do not exist in isolation, but must be connected to form a hypertext structure The purpose of navigation modeling is to specify the way in which the units and pages are linked to form a hypertext
- 11. it expresses the layout and graphic appearance of pages independently of the output device and of the rendition language by means of an abstract XML syntax. Presentation specifications are either page- specific or generic.
- 12. Users and user groups are explicitly modeled in the structure schema in the form of predefined entities called User and Group. The features of these entities can be used for storing group-specific or individual content, like shopping suggestions, list of favorites, and resources for graphic customization.
- 13. Some predefined operations are provided Customized operation can be defined
- 14. A Siteview is a set of pages that the user can experience as a whole Web site Different site views can be defined for different devices and different groups of users Access control and multi-devices delivery is achieved through Siteviews
- 16. Thanks