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Frequency−ordered Returned Semantic Web URIs
Fig. 6.1 The rank-ordered frequency distribution of the number of URIs returned from entity and
concept queries, with the entity queries given on bottom and the concept queries on top
Another question is whether or not there is any correlation between the amount
of URIs returned from the Semantic Web and the popularity of the query. As
shownbyFig. 6.2 ,thereis no correlation between the amount of URIs returned
from the Semantic Web and the query popularity. For entity queries, the correlation
coefficient was 0.0077, while for concept queries, the correlation coefficient was
still insignificant, at 0.0125. The popularity of a query is not related to how much
information the Semantic Web possesses on the information need expressed by the
query: Popular queries may have little data, while infrequent queries may have
a lot. This is likely due to the rapidly changing and event-dependent nature of
hypertext Web queries versus the Semantic Web's preference for more permanent
and less temporally-dependent data. For a more full exploration of the data-set used
in this experiment, including types of URIs, see the paper on 'A Query-Driven
Characterization of Linked Data' (Halpin 2009a). Since this data was collected
in spring of 2009 it may not be currently accurate as a characterization of either
FALCON-S or the state of Linked Data currently, but for evaluation purposes this
sample should suffice, and using random selections from a real human query log is a
definite advance, as randomly sampling all of Linked Data would result in an easily
biased evaluation, away from what human users are interested in and towards what
happens to be available as Linked Data.
Surprisingly, there is a large amount of information that may be of interest to
ordinary hypertext users on the Semantic Web, although there is no correlation
between the popularity of queries and the availability of that information on the
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