August 2009
Intermediate to advanced
456 pages
14h 8m
English
Content preview from Foundations of Semantic Web Technologies
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286 Foundations of Semantic Web Technologies
Filter((?price < 15),
Join(
LeftJoin(
Join(Z, BGP( ?book <http://example.org/price> ?price.)),
Join(Z, BGP( ?book <http://example.org/title> ?title.)),
true
), Union( Join(Z, BGP( ?book <http://example.org/author>
<http://example.org/Shakespeare>.)),
Join(Z, BGP( ?book <http://example.org/author>
<http://example.org/Marlowe>.) ))
)
)
One can simplify Join expressions that contain the empty expression Z as
one of their parameters by replacing them with their other parameters. This
is allowed since Z is the neutral element of the Join operation – similar to
the way in which 0 is the neutral element of ad dition.
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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.