- From: Cresswell, Stephen <stephen.cresswell@tso.co.uk>
- Date: Thu, 14 Jul 2011 15:51:25 +0100
- To: "Provenance Working Group WG" <public-prov-wg@w3.org>
- Message-ID: <F22D0BFCDD4DDC44B92C4E24D751CB9357E25F@W3EXC017023.theso.co.uk>
Sorry for creating noise here, but this question is hindering my understanding of what a bob is. Does a bob describe an entity over some continuous time interval? Since time intervals are mentioned nowhere in the definition of bob, I think that the answer is no. However, when I try to visualise a bob, or think about how to use bobs in representing provenance, I'm always thinking of something which does conceptually have a continuous time interval associated with it, even if the time interval wouldn't be stated. This does make a difference to how bobs would be used. Consider a provenance graph in which some entity starts in some state s, is moved by a process execution to another state s', and then moved by a further process execution back to state s. If a bob doesn't have a time interval associated with it, then the two occurrences of state s could be represented by the same bob, and that might lead to a cyclic provenance graph. If a bob does have a time interval associated with it, then the states s (1st occurrence), s', s (2nd occurrence) would necessarily be represented by 3 different bobs. Similarly, the "B IVP of A" concept is much easier to understand if B is considered to have a time interval which is within the time interval of A. Whereas the concepts seem to me to be easier to understand in the presence of time intervals, this is not how they are defined, so should I be fighting the temptation to think of them that way? Stephen Cresswell Semantic Web Developer The Stationery Office Tel: +44 (0) 01603 69 6926 Email: stephen.cresswell@tso.co.uk Web: www.tso.co.uk <http://www.tso.co.uk/> Orders: www.tsoshop.co.uk <http://www.tsoshop.co.uk/> TSO Information and Publishing Solutions Part of the Williams Lea Group www.williamslea.com <http://www.williamslea.com/> Every day, decisions are made that affect you - do you know enough to have your say? Keep up with Official Publishing at: www.haveyoursayonline.net <http://www.haveyoursayonline.net/> P Please consider the environment before printing this e-mail *********************************************************************************************** This email, including any attachment, is confidential and may be legally privileged. If you are not the intended recipient or if you have received this email in error, please inform the sender immediately by reply and delete all copies from your system. Do not retain, copy, disclose, distribute or otherwise use any of its contents. Whilst we have taken reasonable precautions to ensure that this email has been swept for computer viruses, we cannot guarantee that this email does not contain such material and we therefore advise you to carry out your own virus checks. We do not accept liability for any damage or losses sustained as a result of such material. Please note that incoming and outgoing email communications passing through our IT systems may be monitored and/or intercepted by us solely to determine whether the content is business related and compliant with company standards. *********************************************************************************************** The Stationery Office Limited is registered in England No. 3049649 at 10 Eastbourne Terrace, London, W2 6LG
Received on Thursday, 14 July 2011 14:51:54 UTC