Thesis full text (PDF) - Politecnico di Milano

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3.1.14 Remove Components ............................................................................................... 40 3.1.15 Remove Class component ....................................................................................... 42 3.1.16 Remove Datatype component ................................................................................ 42 3.1.17 Remove Property component ................................................................................. 43 3.1.18 Remove Property Value component ..................................................................... 44 3.1.19 Remove Instance component .................................................................................. 45 3.2 Knowledge‐base Management Components ................................................................ 45 3.2.1 Create‐KB component ................................................................................................ 45 3.2.2 Release‐KB component .............................................................................................. 46 3.2.3 Import‐XMI‐to‐KB component ................................................................................. 46 3.2.4 Export‐XMI‐from‐KB component ............................................................................ 47 3.3 Patterns for Knowledge Exploration and Management ............................................. 47 3.3.1 Knowledge Exploration ............................................................................................. 47 3.3.2 Knowledge Management .......................................................................................... 53 3.4 Social Network Application ............................................................................................ 55 3.4.1 Use Cases of the Application .................................................................................... 55 3.4.2 Application Specification .......................................................................................... 57 3.4.3 Application Design .................................................................................................... 61 3.4.4 Uses of Components and Patterns in the Recommendation Application .......... 63 4. Implementation Experience .................................................................................................. 66 4.1 WebML and WebRatio background .............................................................................. 66 4.2 Runtime Architecture of the Framework ...................................................................... 69 4.3 Implementation of Components..................................................................................... 70 4.3.1 Content publishing units ........................................................................................... 70 4.3.2 Content management operations ............................................................................. 71 4.3.3 Implementation .......................................................................................................... 73 4.4 Implementation of Patterns ............................................................................................. 74 4.5 Application Implementation ........................................................................................... 76 5. Related Work .......................................................................................................................... 86 6. Comparison ............................................................................................................................. 88 7. Conclusion .............................................................................................................................. 92 References ................................................................................................................................... 94 4
1. Introduction At present the Web applications involve more in terms of explicitly declared semantics of published and managed data, because of increasing demands for information integration and exploitation. Typically, the context, and the content of the Web applications assembled from several heterogeneous sources, on which no assumption of common terminology can be done. Recent evolutions of Web applications involve abstruse demands in the explicitly declared meaning of managed data in terms of real-world entities. Data and its non-ambiguous interpretation must be shared between involved parties. In this setting, applications do need to know the meaning of the shared data that we reference in the rest of the article as data semantics. Once such knowledge is formalized and explicitly integrated into the system, it may be interpreted and managed with application-dependent means for delivering the system services and products. The aforementioned limitations can be overcome by representing Web data semantics using the UML class diagrams. We are using an existing framework [1] to serve this purpose which can check the consistency of a knowledge base represented by a UML class diagram, and can make inferences upon the UML objects derive new associations between Web data. We have developed a model-driven knowledge-intensive web application with recommendation feature. 1.1 Motivation Traditional Web applications aim at offering information to users in terms of contents that can be browsed, searched, and modified through navigational links. But unfortunately, the implementation techniques that are currently used for Web applications suffer of several impuissances: • Semantics of data and navigation is conveyed only within design documents that are not usually available along with the Web data at runtime, thus making it impossible to grasp the meaning of the implemented data structures. • Traditional Web applications are not rich enough to cover commonly required aspects of data semantics representation, like generalization hierarchies with overlapping 5
Page 1 and 2: POLITECNICO DI MILANO V Facoltà di
Page 3: Table of Contents Abstract ........
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 and 16: high-level business rules, written
Page 17 and 18: Thanks to the automatic generation
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
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3.3.2.2 Remove property value for a
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3.4.2 Application Specification In
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Action • View Notification: Group
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Send Group Invitation Actor: Group
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A user can recommend friend as Frie
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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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