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Re: [ontolog-forum] Query Decomposition

To: <ontolog-forum@xxxxxxxxxxxxxxxx>
From: "sean barker" <sean.barker@xxxxxxxxxxxxx>
Date: Tue, 27 Jul 2010 07:56:21 +0100
Message-id: <9988E653EDD048B881A5818EC028C816@SMB>

Thanks for the replys so far. Let me make this more specific - the immediate goal is not query optimisation or federated search (the same query across multiple sources), but query answering that relies on joins between two or more independent databases or sources. Further, I am specifically not looking at global-as-view systems, in which the system knows in advance how to map queries expressed in its mediated relations to queries expressed in web service interfaces to the source databases. From my limited understanding, tools like Siri, Ontology Works and Ontoprise are global-as-view systems.
Rather, we are looking at Local-as-view systems, in which there are known mappings from the relations exposed by the sources to fragments of the relations in the mediated schema. This means we can pick our sources at run time based on factors such as cost, trustworthiness or even whether the system is up. Systems from the period 1995 to 2005 include Information Manifold, Info Master and SIMS. I'm trying to find out whether systems like that have been exploited in commercial tools, and if not, why not?
Doing this declaratively would seem to require both an ontology description of the contents of a data source and a description of the source itself - the queries it exposes, the costs of queries, etc. One question that springs to mind is whether this could be mediated through a UDDI equivalent system?
Sean Barker, Bristol

From: ontolog-forum-bounces@xxxxxxxxxxxxxxxx [mailto:ontolog-forum-bounces@xxxxxxxxxxxxxxxx] On Behalf Of sean barker
Sent: 23 July 2010 21:10
To: ontolog-forum@xxxxxxxxxxxxxxxx
Subject: [ontolog-forum] Query Decomposition

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I've just been looking at some of the work on automatic query decompostion. It looks like there was a great deal of work in the late nineties, see for example Alon Halevy "Answering Queries Using Views: A Survey" but more recent work looks thinner on the ground, although there is some on using T-boxes. Given the age of the work, are there any tools or systems out there that support automatic query decomposition? or if not, why not?
Sean Barker, Bristol

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