- From: John Goodwin <John.Goodwin@ordnancesurvey.co.uk>
- Date: Tue, 24 Feb 2009 11:26:15 -0000
- To: <public-lod@w3.org>
Hi, Forgive me if this has been discussed elsewhere/already, but I was wondering if we need some kind of LOD best practice when it comes to using OWL to describe our ontologies on the linked data web. I'd like to futureproof any LOD produced at OS for the days when we can reason on the linked data web, and as such I'd like to use OWL (and not just RDFS). However as the LOD is all about (large amounts of) data it seems to me that we should restrict ourselves to either of the tractable fragments: # OWL 2 QL is aimed at applications that use very large volumes of instance data, and where query answering is the most important reasoning task. In OWL 2 QL, conjunctive query answering can be implemented using conventional relational database systems. Using a suitable reasoning technique, sound and complete conjunctive query answering can be performed in LOGSPACE with respect to the size of the data (assertions). As in OWL 2 EL, polynomial time algorithms can be used to implement the ontology consistency and class expression subsumption reasoning problems. The expressive power of the profile is necessarily quite limited, although it does include most of the main features of conceptual models such as UML class diagrams and ER diagrams. # OWL 2 RL is aimed at applications that require scalable reasoning without sacrificing too much expressive power. It is designed to accommodate OWL 2 applications that can trade the full expressivity of the language for efficiency, as well as RDF(S) applications that need some added expressivity. OWL 2 RL reasoning systems can be implemented using rule-based reasoning engines. The ontology consistency, class expression satisfiability, class expression subsumption, instance checking, and conjunctive query answering problems can be solved in time that is polynomial with respect to the size of the ontology. (more info http://www.w3.org/TR/owl2-profiles/) Should this be mentioned in the LOD tutorials being produced? Interested in your thoughts. John -- Dr John Goodwin Research Scientist Ordnance Survey Research C530, Romsey Road, SOUTHAMPTON, United Kingdom, SO16 4GU Phone: +44 (0) 23 80305756 | Fax: +44 (0) 23 80305072 www.ordnancesurvey.co.uk/research | John.Goodwin@ordnancesurvey.co.uk Please consider your environmental responsibility before printing this email. . This email is only intended for the person to whom it is addressed and may contain confidential information. If you have received this email in error, please notify the sender and delete this email which must not be copied, distributed or disclosed to any other person. Unless stated otherwise, the contents of this email are personal to the writer and do not represent the official view of Ordnance Survey. Nor can any contract be formed on Ordnance Survey's behalf via email. We reserve the right to monitor emails and attachments without prior notice. Thank you for your cooperation. Ordnance Survey Romsey Road Southampton SO16 4GU Tel: 08456 050505 http://www.ordnancesurvey.co.uk
Received on Tuesday, 24 February 2009 11:26:54 UTC