YASGUI

Feeling the pulse of Linked Data

Laurens Rietveld
VU University Amsterdam
http://presentations.laurensrietveld.nl/ekaw2014

What we (don't) know about the LOD Cloud

Strengths and weaknesses of server logs

An Observational Lense

YASGUI Feature-set

Access to any SPARQL endpoint
Auto-completion
Syntax Highlighting
Full SPARQL 1.1 syntax support
Full SPARQL query results support
Syntax Checking
Platform independent
Retention of user settings
Easily bookmark and share queries
Easily search for endpoints
Downloading results

Latest Numbers

Tracking information of 57% of the user base
80.000 queries
4.600 users
Executed on ~600 endpoints

Completely different than server logs

The Basics

We write complex queries

Exploiting endpoint logs

Open vs. Closed LOD

We only use a fraction

Namespaces

Popularity

Namespace	Ding et al. [1]	prefix.cc	YASGUI
rdf:	1	2	2
foaf:	2	3	6
dc:	3	5	10
rdfs:	4	6	1
admin:	5	39	none
rss:	6	9	251
vcard:	7	32	20
bio:	8	52	none

[1] Ding, Li, et al. "How the semantic web is being used: An analysis of foaf documents." HICSS'05

Popularity vs. Frequency

Conclusions

Unique observational lens
More than usage analysis alone