Health Warning:
This is going to be
a pretentious talk
Philosophical confession
coming up:
What I believe
about scientific knowledge
Laws about
the information universe,
just like laws about
the physical universe
alchemy
Did a decade
of Semantic Web work
help to discover
any Computing Science laws?
What have we built?
Let’s treat the last 10 years
as a giant experiment
Some well known
“laws” about information
do indeed apply
RE-USE
USE
USE
U = 1-R
Factual knowledge
is a graph
Terminological knowledge
is a hierarchy
Terminological knowledge
is much smaller
than the factual knowledge
Dataset
Schema
closure
LUBM
8sec
Linked Life Data 332sec
FactForge
89sec
Full
closure
Ratio
1h15min
1h5min
2h45min
562
11
111
Terminological knowledge
is of low complexity
heterogeneity
is unavoidable
heterogeneity
is solvable
socially,
culturally,
economically
(and a little bit algorithmically)
publication should be distributed,
computation should be centralised
speed increases with parallelisation
35
Throughput (Ktriples/sec)
30
25
20
15
10
5
0
0
2
4
6
Input size (billion triples)
8
10
Throughput (KTriples/sec)
2000
1900
1800
1700
1600
1500
1400
1300
1200
1100
1000
900
800
700
600
500
400
300
200
100
0
in 2011
in 2010
0
10
20
30
40 50 60 70 80
Input size (billion triples)
90
100 110
knowledge about knowledge
Finally:
a call to arms
Theory?
What theory?
Big thank you to:
Myria Nikolaidou
&
Paul Groth
Annette ten Teije
Stefan Schlobach
Christophe Gueret
Emanuele Della Valle
and all at the [email protected] group
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Semantic Web: does it work in theory?