Information gathering during planning for Web Service composition
Hierarchical task network (HTN) based planning techniques have been applied to the problem of composing Web Services, especially when described using the OWL-S service ontologies. Many of the existing Web Services are either exclusively information providing or crucially depend on information-provid...
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Published in | Web semantics Vol. 3; no. 2; pp. 183 - 205 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
01.10.2005
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Subjects | |
Online Access | Get full text |
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Summary: | Hierarchical task network (HTN) based planning techniques have been applied to the problem of composing Web Services, especially when described using the
OWL-S
service ontologies. Many of the existing Web Services are either exclusively information providing or crucially depend on information-providing services. Thus, many interesting service compositions involve collecting information either during execution or during the composition process itself. In this paper, we focus on the latter issue. In particular, we present
ENQUIRER
, an HTN-planning algorithm designed for planning domains in which the information about the initial state of the world may not be complete, but it is discoverable through plan-time information-gathering queries. We have shown that
ENQUIRER
is sound and complete, and derived several mathematical relationships among the amount of available information, the likelihood of the planner finding a plan, and the quality of the plan found. We have performed experimental tests that confirmed our theoretical results and that demonstrated how
ENQUIRER
can be used for Web Service composition. |
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ISSN: | 1570-8268 1873-7749 |
DOI: | 10.1016/j.websem.2005.07.001 |