Johan Sundström wrote:
> Peeking at
>
> http://simile.mit.edu/wiki/Exhibit/API/MapView
>
> I got interested in ex:proxy. What is it used for? I've peeked at the
> code, and for all I can see it's only probed for by the timeline view,
> but I still don't quite grasp what to do with it. :-) But I'm dead
> curious.
>
You need two values (lat and lng) to plot an item. Those two values
might or might not be properties of the item itself. Let's take a gory
example: 2 suspects of a crime are both inter-city truck drivers and
each visits a different sequence of cities on his regular trucking
route. We would like to plot where each suspect has been on a map. But
each suspect himself doesn't have lat/lng; the cities that he visits do.
So, the map view should be specified with:
ex:proxy=".city-visited"
ex:lat=".latitude"
ex:lng=".longitude"
Note that it would be wrong to specify
ex:lat=".city-visited.latitude"
ex:lng=".city-visited.longitude"
because you would get cross-combinations of lat/lng from all the cities
visited. That is, if suspect A visits city X and city Y, you would get 4
points for A instead of just 2:
[ cityX.latitude, cityX.longitude ]
[ cityX.latitude, cityY.longitude ]
[ cityY.latitude, cityY.longitude ]
[ cityY.latitude, cityX.longitude ]
Not what you want. (Of course, you won't have this trouble if each lat
and lng pair is bound into a single string.)
> Are there any live examples using it to peek at?
>
The timeline view of the presidents exhibit uses ex:proxy.
http://simile.mit.edu/exhibit/examples/presidents/presidents.html
Select "Democratic" and "Presbyterian", then switch to the "Terms" view,
and scroll to around 1890. You should see 2 terms for Grover Cleveland.
Presidents and crime suspects. I wish Semantic Web research examples
move beyond the usual "publications" domain and get a little less
scholarly and more ... scandalous. :-)
Cheers,
David
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