d'Interfaces à base de Connaissances
pour des Services En Ligne
LRI (Laboratoire de Recherche en Informatique - Université Paris
XI) - France
system over sources that are distributed and possibly heterogeneous.
The approach which has been chosen is to define an information server
as a knowledge-based mediator between users and several existing information
sources relative to a same application domain. The mediator gives its
users the illusion of a centralized and homogeneous information system.
It allows them to ask domain-level queries and takes in charge in their
place the access to the relevant sources in order to obtain the answers
to the queries.
We experiment PICSEL
on examples coming from the tourism domain.
to a serie of three projects : PICSEL 1,
PICSEL 2 and PICSEL 3. The last
one has begun in january 2005.
In PICSEL 3, the
mediation architecture is hybrid. The mediator also integrate a local
data warehouse which contains data given by content providers. These
data are conform to the mediator schema represented in RDFS+ language
(RDFS extended by a fragment of OWL-DL). The data warehouse will be
progressively enriched by external data.
One of the main
goals of PICSEL 3 is the semantic treatment of the mediator answers.
More accurately we want to study the references reconciliation problem
in order to eliminate redundancies and to fusion data coming from different
Another goal is
to propose an approach where wrappers are built semi-automatically.
projects heading to have more details about PICSEL 1 and PICSEL 2.