- From: Eliot Christian <echristi@usgs.gov>
- Date: Thu, 11 Apr 2002 17:50:22 -0400
- To: Alan Kent <ajk@mds.rmit.edu.au>, ZIG <www-zig@w3.org>
Hi Alan For just the purpose you have in mind, GILS-complaint servers are required to support such a search on Use attribute 1012, see <http://www.gils.net/prof_v2.html#sec_7_4> Per requirements in Annex A <http://www.gils.net/prof_v2.html#annex_a>, this access point must support a "Date" structure and both the "Greater Than" and "Equal" relation attributes. In Bib-1 (1.2.840.10003.3.1) and GILS (1.2.840.10003.3.5), the attributes are: type 1=1012 (Use=date-last-modified), type 2=3 (Relation=equal), type 2=5 (Relation=greater-than), and type 4=5 (Structure=date-normalized). The Geo Profile includes search on a date range, but focused on "time-period-of-content". (For example, try the "Time Period" tab at <http://geogateway.state.mn.us/documents/index.html> ) Eliot At 05:13 PM 4/11/2002 +1000, Alan Kent wrote: >This might be the wrong place to ask this, but I was wondering if >there were any public databases that had implemented all of the >following characteristics (I tried looking at the IndexData web >site, but all the potential databases failed for one reason or other, >and there are so many to sift through!). I could build my own >test database, but I would rather use a "real" database. > >* Support =, >, < etc queries on Bib-1 lastModifiedTime >* Does not mind me doing queries and fetching lots of records > (I don't want too many, but could be hundreds or thousands). >* Supports scan on Bib-1 last modified time desirable (so can check > values in index and so I can do sensible queries on database) > >Basically I was wondering if it was possible to efficiently "harvest" >a Z39.50 database. The best I can think of is using last-modified-time. >Downloading the full database each time seems far to inefficient, >so I would want to find out what has changed since the last visit. > >Any conventions people use for the format of last modified would >also be of interest. > >Thanks! >Alan >-- >Alan Kent (mailto:ajk@mds.rmit.edu.au, http://www.mds.rmit.edu.au/~ajk/) >Postal: Multimedia Database Systems, RMIT, GPO Box 2476V, Melbourne 3001. >Where: RMIT MDS, Bld 91, Level 3, 110 Victoria St, Carlton 3053, VIC >Australia. >Phone: +61 3 9925 4114 Reception: +61 3 9925 4099 Fax: +61 3 9925 4098 Eliot Christian echristi@usgs.gov 1-703-648-7245 FAX 1-703-648-7112 US Geological Survey, 802 National Center, Reston VA 20192
Received on Thursday, 11 April 2002 17:50:50 UTC