In this work, a data integration approach using a federated model based on a
service oriented architecture (SOA) is presented. The BioMOBY middleware
was used to implement each service which is part of the integration process. As
an example of usage of this architecture, a web tool for candidate SNP selection
has been developed. Thus, several BioMOBY services have been created as
the model layer of the web application. Each data source has a wrapper which
communicates with the federated model, that is, the BioMOBY model, and this
model is the one that interacts with the client.