| description |
Service composition on the Grid is a challenging task as documented
in existing research work. Even though there are initial attempts to
use the Business Process Execution Language (BPEL) to compose
services on the Grid, still there is a significant lack of
flexibility and reusability needed in scientific applications. In
this paper we present BPEL for Semantic Web Services (BPEL4SWS) - a
language that facilitates the orchestration of Grid Services exposed
as traditional Web Services or Semantic Web Services using a
process-based approach. It is based on the idea of WSDL-less BPEL
and incorporates semantic descriptions of process activity
implementations which increases the flexibility of business
workflows as well as scientific workflows. Following an approach
that uses a set of composable standards and specifications, BPEL4SWS
is independent of any Semantic Web Service framework and therefore
can also utilize any kind of Semantic Grid services. The advantages
of BPEL4SWS are: (1) compliance with standards, (2) independence on
service technologies, (3) applicability for both business
applications as well as scientific workflows that use Grid services,
(4) improved flexibility of processes.
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