Database techniques for the World-Wide Web: a survey
ACM SIGMOD Record
Information Systems - Special issue on semistructured data
Queries and computation on the Web
Theoretical Computer Science - Special issue on the 6th International Conference on Database Theory—ICDT '97
W3QS: A Query System for the World-Wide Web
VLDB '95 Proceedings of the 21th International Conference on Very Large Data Bases
Structure-Based Queries over the World Wide Web
ER '98 Proceedings of the 17th International Conference on Conceptual Modeling
Semantics and complexity of SPARQL
ACM Transactions on Database Systems (TODS)
Executing SPARQL Queries over the Web of Linked Data
ISWC '09 Proceedings of the 8th International Semantic Web Conference
LinkedGeoData: Adding a Spatial Dimension to the Web of Data
ISWC '09 Proceedings of the 8th International Semantic Web Conference
Querying the Web of Data: A Formal Approach
ASWC '09 Proceedings of the 4th Asian Conference on The Semantic Web
Linked data query processing strategies
ISWC'10 Proceedings of the 9th international semantic web conference on The semantic web - Volume Part I
Linked Data
SIHJoin: querying remote and local linked data
ESWC'11 Proceedings of the 8th extended semantic web conference on The semantic web: research and applications - Volume Part I
Zero-knowledge query planning for an iterator implementation of link traversal based query execution
ESWC'11 Proceedings of the 8th extended semantic web conference on The semantic web: research and applications - Volume Part I
Foundations of traversal based query execution over linked data
Proceedings of the 23rd ACM conference on Hypertext and social media
Foundations of traversal based query execution over linked data
Proceedings of the 23rd ACM conference on Hypertext and social media
An introduction to SPARQL and queries over linked data
ICWE'12 Proceedings of the 12th international conference on Web Engineering
Querying Semantic Data on the Web?
ACM SIGMOD Record
SQUIN: a traversal based query execution system for the web of linked data
Proceedings of the 2013 ACM SIGMOD International Conference on Management of Data
RDFS and OWL reasoning for linked data
RW'13 Proceedings of the 9th international conference on Reasoning Web: semantic technologies for intelligent data access
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Query execution over the Web of Linked Data has attracted much attention recently. A particularly interesting approach is link traversal based query execution which proposes to integrate the traversal of data links into the creation of query results. Hence -in contrast to traditional query execution paradigms- this does not assume a fixed set of relevant data sources beforehand; instead, the traversal process discovers data and data sources on the fly and, thus, enables applications to tap the full potential of the Web. While several authors have studied possibilities to implement the idea of link traversal based query execution and to optimize query execution in this context, no work exists that discusses theoretical foundations of the approach in general. Our paper fills this gap. We introduce a well-defined semantics for queries that may be executed using a link traversal based approach. Based on this semantics we formally analyze properties of such queries. In particular, we study the computability of queries as well as the implications of querying a potentially infinite Web of Linked Data. Our results show that query computation in general is not guaranteed to terminate and that for any given query it is undecidable whether the execution terminates. Furthermore, we define an abstract execution model that captures the integration of link traversal into the query execution process. Based on this model we prove the soundness and completeness of link traversal based query execution and analyze an existing implementation approach.