Thesis full text (PDF) - Politecnico di Milano

serializations. Such separation grants the independence from the specific reasoning engine and
from the UML serialization format.
Controller
(Servlet)
Actions
(Java classes)
Page Services
(Java classes)
Knowledge Base Interface
(Java)
Web
browser
WEB
Web
server
View
(JSP)
State Objects
(Java)
Knowledge
Exploration
Unit Services
(Java classes)
Tableau
Reasoner
Internalization
TBox
Absorption
Symbols
Components Interaction
HTTP/SOAP messages
Component
Servlet Container
Knowledge
Management
Operation Services
(Java classes)
Business Logic
Service
Species Validation &
Ontology Repair
Knowledge Layer - Pellet
XMI
Subcomponent
Application Server
Data Layer
Figure 4.3: Runtime architecture for the framework
4.3 Implementation of Components
As we have mentioned earlier, the framework components are specified as new WebML
primitives. For their implementation we exploit the WebRatio plug-in mechanism, which allows
to define new units and to seamlessly integrate them in the design and execution of the
applications. In the following we describe the list of new WebML units that have been defined as
implementations of the components discussed in Section 3.
4.3.1 Content publishing units
The Hierarchy, Class, Datatype, Property, Property Value, Instance, and Explanation
components are implemented as content units. The UML classes acting as selection conditions
for the corresponding UML component are defined for the respective content unit, with values
being parametric on the user choices. The units produce in output the names of the deducted
elements. Table 4.1 summarizes the Hierarchy components together with their symbol, the
expected inputs and delivered outputs. The remaining exploration components are summarized in
table 4.2.
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