When the database is distributed there have to be an
approach for communicating between the machines on
which the database's tables are stored. According to the
idea of Web Services, two methods can be used for
communication - SOAP protocol and HTTP/GET [I], [SI.
But SOAP is a typical communication channel, used in web
service applications. The queries to the database can be
designed as web services. The database can be
heterogeneous because of the interoperability of Web
Service application.