By Patrick Van Bommel
Info Modeling for web purposes considers the basics of website modeling. It supplies theoretical heritage in addition to useful modeling thoughts, which help in the making plans and improvement of websites, different collections of hyperdocument and web-based info platforms in most cases. in addition to the modeling of web page buildings, navigation paths, and presentation services, this can aid to accomplish quite a few extra projects, equivalent to edition to consumer teams.
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As a result, constraint and path expressions are simplified, including only information labels. Constraint checking can be done by matching paths expressions with constraint expressions. Note that the special predicate path matches paths of any length. For example, considering the paths and the constraint above, it is possible to conclude that constraint c1′ is satisfied. Note that the negation in the constraint means that paths which have that pattern are not valid. As none of the paths pi can match the pattern, they are all valid.
This is written in the form a Ä b to define a path formed of action a followed by action b. In the Web site context, a path is simply a sequence of information display. Hence, constraints on a Web site can be expressed in terms of valid or invalid paths. A finite number of paths can be derived following the rules: 1. All paths begin in the same display unit (denoted as the homepage). 2. No display unit can be revisited. 3. , display units that have no outgoing links. For example, from the graph presented in Figure 4, the following paths can be derived: • p1: display(homepage) ⊗ display(people) ⊗ display(publications) 38 Chapter 2: Verifying Web Site Properties Using Computational Logic Chapter 2: Verifying Web Site Properties Using Computational Logic 39 • p2: display(homepage)⊗ display(research)⊗ display(project)⊗ • display(publications) • p3: display(homepage)⊗ display(research)⊗ display(project)⊗ • display(people) ⊗ display(publications) Constraint expressions are similar to path expressions, basically imposing an order to the presentation of information.
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