Document representation and optimized retrieval
Thomas Johannsen <thomas@aic.co.jp> Fri, 17 April 1992 08:13 UTC
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Date: Fri, 17 Apr 1992 15:57:48 -0000
From: Thomas Johannsen <thomas@aic.co.jp>
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Subject: Document representation and optimized retrieval
Recently, there was a discussion going on concerning document representation and retrieval at this list. The following might be of interest for you: AIC Systems Laboratories, Tohoku University and WIDE (all in Japan) have a project (Soft Pages Project) running that deals with representing and retrieving of fileserver information by use of the X.500 Directory. The aim is to provide users with information not only about the set of fileservers holding the files they want but also the most cost-effective site ( from the network management point of view) from which the file may be retrieved (by ftp, ..). Optimization can be done for speed, cost,traffic-load .. . That is, comprehensive support will be provided for users for file retrieval. Two aspects are covered in this project. The first deals with the Directory representation of the contents of fileservers. We have done it in a manner similiar to that of W. Yeong (see his entries at o=Internet@ou=FTP Archives). The second aspect deals with the storage of network configuration information which is (in our opinion) a very useful application of the Directory and can be used by a multitude of applications. An image of the network (the aim is an Internet image in future) in terms of trunk lines and (major) nodes/gateways is represented in the Directory. Line and node objects have some attributes (like speed, costs, delay, etc.) that allow an evaluation/comparison of network connections. Soft Pages Project uses the above features to give users a cost-effective ftp-site for a sought file. A lot of costly bandwidth, particularly in overseas links, is used for ftp. It is believed that if local alternatives for file retrieval is used more often, a lot of costly bandwidth, particularly in overseas links, will be released. This is because files exist in multiple copies not only all over the world but even within one country or organization. The problem we face today is that even if users are aware of their inefficient file retrieval they lack the knowledge of alternatives. There is a document "Optimizing Document Retrieval by Using X.500 Directory * Soft Pages Project" giving a detailed description. The ASCII version can be obtained from me via e-mail and we will put a postscript version on an anonymous ftp server soon. Any comments are welcome. Please either post to this list or e-mail me. There is also a mailing list 'spp@aic.co.jp' discussing Soft Pages issues. To join send a mail to 'spp-request@aic.co.jp'. Thomas +---------------------------------------------------------------------+ | Thomas Johannsen Internet: thomas@aic.co.jp | | AIC Systems Lab. BITNET: JOHANNSE at DDDTU1 | | Sendai (Japan) Tel: +81 22 279 3310 Fax: +81 22 279 3640 | +---------------------------------------------------------------------+
- Document representation and optimized retrieval Thomas Johannsen
- Re: Document representation and optimized retriev… Jacob Levanon - Network Applications/812 855-2598