Thesis full text (PDF) - Politecnico di Milano

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• Presentation design: offers functionality for defining the presentation style of the application, allowing the designer to create XSL style sheets and associate them with pages, and organize page layout, by arranging the relative position of content units in the page. • Code generation: automatically translates site views into running Web applications built on top of the Java2EE, Struts, and .NET platforms. The diagram of figure: 2.2 summarize the design flow of WebRatio, highlighting the design phases, together with their inputs and outputs. The different design steps will be described in more detail in the next sections. Figure 2.2: Design flow diagram of WebRatio 16
Thanks to the automatic generation of code, the tool can be used for fast prototyping, thus shortening the requirements validation cycle. Unlike traditional prototyping tools, which generate application mock-ups, the WebRatio code generator produces application modules running on state-of-the-art architectures, and can be used for implementation, maintenance, and evolution. Code generation starts from the outputs of conceptual design and therefore implementation and maintenance benefit from the presence of a conceptual specification of the application. The internal software architecture of the applications created by WebRatio exploits the design principles and techniques. In particular, applications are built using the Model-View-Controller pattern, generic components in the business tier, and CSS and XSL presentation rules for factoring out the look and feel from the page templates. WebRatio internally uses XML and XSL as the formats for encoding both the specifications and the code generators: XML is used for describing data and hypertext schemas, whereas XSL is used for generating the graphic properties and layout of the page templates, for validity checking, and for automatic project documentation. The extensive use of XML and XSL facilitates custom extensions, which apply both to the WebML language, which can be extended with user-defined units and operations, and to the tool functions, which can be enriched with custom consistency checkers, documentation and code generators, and presentation rules. 2.4 Semantic Web 2.4.1 A First Look at the Semantic Web The Semantic Web is an extension of the current Web. It is constructed by linking current Web pages to a structured data set that indicates the semantics of this linked page. A smart agent, who is able to understand this structure data set, will then be able to conduct intelligent actions and make educated decisions on a global scale. “The Semantic Web is an extension of the current Web in which information is given welldefined meaning, better enabling computers and people to work in cooperation. A web of data 17
Page 1 and 2: POLITECNICO DI MILANO V Facoltà di
Page 3 and 4: Table of Contents Abstract ........
Page 5 and 6: 1. Introduction At present the Web
Page 7 and 8: • Definition of the formal repres
Page 9 and 10: This approach overcomes the develop
Page 11 and 12: Both the teleological and the ontol
Page 13 and 14: consists of a data schema, describi
Page 15: high-level business rules, written
Page 19 and 20: 2.4.2 RDF Resource Description Fram
Page 21 and 22: Third, besides the aforementioned r
Page 23 and 24: The XMI serialization of UML [33] e
Page 25 and 26: 2.9.2.1 Pellet Pellet 1 [47] is an
Page 27 and 28: 3. Semantics Web based Recommendati
Page 29 and 30: them by invoking respectively the c
Page 31 and 32: etrieves the properties by their ca
Page 33 and 34: Figure 3.6: Instance Component 3.1.
Page 35 and 36: 3.1.8 Add Components The Add compon
Page 37 and 38: Add Class Component ClassDisjointOf
Page 39 and 40: PropertyDisjointOfProperty (for ins
Page 41 and 42: first-class citizens, we have more
Page 43 and 44: Figure 3.17: Remove Datatype Compon
Page 45 and 46: 3.1.19 Remove Instance component Th
Page 47 and 48: 3.2.4 Export-XMI-from-KB component
Page 49 and 50: 3.3.1.2 Properties of a class patte
Page 51 and 52: 3.3.1.5 Instances of a class assumi
Page 53 and 54: 3.3.1.8 Instances of a class assumi
Page 55 and 56: 3.3.2.2 Remove property value for a
Page 57 and 58: 3.4.2 Application Specification In
Page 59 and 60: Action • View Notification: Group
Page 61 and 62: Send Group Invitation Actor: Group
Page 63 and 64: A user can recommend friend as Frie
Page 65 and 66: In the figure 3.37, a User browsing
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Through the entry unit in figure 4.
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Figure 4.2: Example of WebML hypert
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Description Classes Hierarchy Unit
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Add PropertyValueAxiom Input: manda
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4.4. The top segment of the page is
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page otherwise it will go to the er
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We are showing current user’s inf
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current user is sending a friend in
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The information of a particular gro
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Figure 4.20: HTML view to Post New
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the application domain as extended
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Knowledge Instances Yes Yes Yes Yes
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OWL DL KB Framework CLASS HIERARCHI
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of a specific group members of the
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[22] OMG UML (2007), Unified Modeli
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[56] BRAMBILLA, M., CERI, S., FRATE
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