June 2005
Intermediate to advanced
568 pages
24h 7m
English
Content preview from Mapping Hacks
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Chapter 9, Mapping with Other People
#99 Map Your Friend-of-a-Friend Network
HACK
network. It can live on a web server, and it’s usual to use the .rdf extension
and
text/rdf+xml MIME type for it.
The FOAF specification, detailed at http://xmlns.com/foaf/0.1/, provides
some simple ways to indicate your approximate location. You can say you
are
foaf:based_near a location. The semantics of “near” are intentionally
vague. What
foaf:based_near points to is a geo:SpatialThing, something
that generally has a latitude and longitude property in WGS84.
Alternatively, one can convey approximate location in FOAF using the
contact:nearestAirport property. This comes from the “Contact” personal
information management vocabulary published by the w3 (http://www.w3.
org/2000/10/swap/pim/contact#). Airports are referred to by their three-let-
ter international airport code (LHR, SFO, LAX, etc.). The
nearestAirport
property was designed to allow people to indicate where they are, in an
international context, without revealing too much personal contact informa-
tion.
Each airport has a URL associated with it in RDF, which is defined in an air-
port schema:
<contact:nearestAirport>
<airport:Airport rdf:about="http://www.daml.org/cgi-bin/
airport?SFO"/>
</contact:nearestAirport>
I can also create a link to another FOAF file by attaching:
<rdfs:seeAlso rdf:resource="http://example.com/foaf.rdf"/>
Crawling the FOAF Web
The
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.