Exactly a week a go I was coming home from Mashed Libraries in London (Birkbeck).
I wont bore you with details of the day (or more to the point, I’m lazy and others have already done it better than i could (of course, I should have made each one of those words a link to a different blog but I’m laz… or never-mind)).
Thanks to Owen Stephens for organising, UKOLN for sponsoring and Dave Flanders (and Birkbeck) for the room.
During the afternoon we all got to hacking with various sites and services.
I had previously played around with the Talis Platform (see long winded commentary here, got it seems weird that at the time I really didn’t have a clue what I was playing with, and it was only a year a go!).
I built a basic catalogue search based on the ukbib store. I called it Stalisfield (which is a small village in Kent).
But one area I had never got working was the Holdings. So I decided to set to work on that. Progress was slow, but then Rob Styles sat down next to me and things started to move. Rob help create Talis Cenote (which I nicked most of the code from) and generally falls in to that (somewhat large) group of ‘people much smarter than me’.
We (well I) wanted to show which Libraries had the book in question, and plot them on a Google Map. So once we had a list of libraries we needed to connect to another service to get the location for each of these libraries. The service which fitted this need was the Talis Directory (Silkworm). This raised a point with me, it was a good job there was a Talis service which used the same underlying ID codes for the libraries i.e. the holdings service and the directory both used the same ID number. It could have been a problem if we needed to get the geo/location data from something like OCLC or Librarytechnology.org, what would we have searched on? a Libraries name? hardly a reliable term to use (e.g. The University of Sussex Library is called ‘UNIV OF SUSSEX LIBR’ in OCLC!). Do Libraries need a code which can be used to cross reference them between different web services (a little like ISBNs for books)?
Using the Talis Silkworm Directory was a little more challenging than first thought, and the end result was a very long URL which used SPARQL (something which looks a steep learning curve to me!).
In the mean time, I signed up for Google Maps, and gave myself a crash course in setting it up (I’m quite slow to pick these things up). So we had the longitude and latitude co-ordinates for each library, and we had a Google Map on the page, we just needed to connect to the two.
Four people at Mashedlibrary trying to debug the last little bit of my code.
Back home, I fixed this (though I never would have known I needed to do this without help).
You can see an example here, and here and here (click on the link at the top to go back to the bib record for the item, which, by the way, should show a Google Book cover at the bottom, though this only works for a few books).
You can click on a marker to see the name of library, and the balloon also has a link which should take you straight to item in question on the library’s catalogue.
It is a little slow, partly due to my bad code and partly due to what it is doing:
- Connecting to the Talis Platform to get a list of libraries which have the book in question (quick)
- For each library, connect to the Talis Silkworm Directory and perform a SPARQL query to get back some XML which includes the geo co-ordinates. (geo details not available for all libraries)
- As this last point needs to be done in the <head> of the page, it is only at this point that we can push the page out to the browser.
I added one last little feature.
It is all well and good to see which libraries have the item you are after, but you are probably iterested in libraries near you. So I used the Maxmind GeoLite City code-library to get the user’s rough location, and then centering the map on this (which is clearly not good for those trying to use it outside the UK!). This seems to work most of the time, but it depends on your ISP, some seem more friendly in their design towards this sort of thing. Does the map centre on your location?