| The ARTEMIS
prototype for the construction of reconciled views based on affinity evaluation
and interactive clustering |
Silvana Castano, Alfio Ferrara, Michele Melchiori, Giorgio Ornetti
Descrizione
The
ARTEMIS tool environment performs the semantic integration of
strongly heterogeneous data sources, both structured and
semi-structured. The integration process is based on the construction
of a semantically rich representation of the data sources to be
integrated, by means of a common data model based on the ODLi3
language.
The first
phase of the ARTEMIS integration process is the schema matching. Goal
of this functionality is to identify ODLi3 classes candidate to
integration, that is, classes that describe the same or semantically
related information in different source schemas. To this end,
affinity coefficients are evaluated for all possible pairs of ODLi3
classes, based on the relationships in the Common Thesaurus properly
strengthened.
To asses the level of affinity of two ODLi3 classes in a
comprehensive way, a Global Affinity coefficient taking into account
also the knowledge provided by extensional properties is introduced.
Global affinity coefficients are then used by a hierarchical
clustering algorithm, to classify ODLi3 classes. The output of the
clustering procedure is an affinity tree, where ODLi3 classes are the
leaves and intermediate nodes have an associated affinity value,
holding for the classes in the corresponding cluster. Cluster for
integration (candidate clusters) are interactively selected from the
affinity tree using a threshold based mechanism.
The definition of the mediation scheme is performed through
rule-based unification techniques by which classes belonging to a
given cluster are reconciled into global classes.
Ambiente di sviluppo e di esecuzione
JAVA JDK 1.4 - CORBA 2.2
Eseguibile in ambienti Windows 9x/NT - Unix
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