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6 CONCLUSIONS AND FUTURE
WORK
In this work, we have designed a querying system
which is capable of taking several kinds of data con-
cerns into account. We have provided a basic model
in which we concentrate on three concerns, namely
data quality, quality of service, and licensing. How-
ever, our approach is generic in the sense that one can
incorporate arbitrary data concerns. Indeed, one item
on our agenda for future work will be to integrate fur-
ther data concerns like pricing, data security, auditing
model, etc. Another important goal for future work is
the integration of our querying system into a powerful
mash-up tool. So far, our querying system is designed
to access data sources via XQuery. In the future, we
want our system to access also data sources which ex-
pose their data via web services.
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