TY  - JOUR
A1  - Verborgh, Ruben
A1  - Vander Sande, Miel
A1  - Hartig, Olaf
A1  - Van Herwegen, Joachim
A1  - De Vocht, Laurens
A1  - De Meester, Ben
A1  - Haesendonck, Gerald
A1  - Colpaert, Pieter
T1  - Triple Pattern Fragments: A low-cost knowledge graph interface for the Web
JF  - Web semantics : science, services and agents on the World Wide Web
N2  - Billions of Linked Data triples exist in thousands of RDF knowledge graphs on the Web, but few of those graphs can be queried live from Web applications. Only a limited number of knowledge graphs are available in a queryable interface, and existing interfaces can be expensive to host at high availability. To mitigate this shortage of live queryable Linked Data, we designed a low-cost Triple Pattern Fragments interface for servers, and a client-side algorithm that evaluates SPARQL queries against this interface. This article describes the Linked Data Fragments framework to analyze Web interfaces to Linked Data and uses this framework as a basis to define Triple Pattern Fragments. We describe client-side querying for single knowledge graphs and federations thereof. Our evaluation verifies that this technique reduces server load and increases caching effectiveness, which leads to lower costs to maintain high server availability. These benefits come at the expense of increased bandwidth and slower, but more stable query execution times. These results substantiate the claim that lightweight interfaces can lower the cost for knowledge publishers compared to more expressive endpoints, while enabling applications to query the publishers’ data with the necessary reliability.
KW  - Linked Data
KW  - Linked Data Fragments
KW  - Querying
KW  - SPARQL
Y1  - 2016
U6  - https://doi.org/10.1016/j.websem.2016.03.003
SN  - 1570-8268
VL  - 37-38
SP  - 184
EP  - 206
PB  - Elsevier
CY  - Amsterdam
ER  -