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RQL: A Declarative Query Language for RDF

by: Gregory Karvounarakis, Sofia Alexaki, Vassilis Christophides, Dimitris Plexousakis, and Michel Scholl

In: WWW '02: Proceedings of the 11th international conference on World Wide Web New York, NY, USA: ACM Press (2002) , p. 592-603.

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URL:	http://doi.acm.org/10.1145/511446.511524

Real-scale Semantic Web applications, such as Knowledge Portals and E-Marketplaces, require the management of large volumes of metadata, i.e., information describing the available Web content and services. Better knowledge about their meaning, usage, accessibility or quality will considerably facilitate an automated processing of Web resources. The Resource Description Framework RDF enables the creation and exchange of metadata as normal Web data. Although voluminous RDF descriptions are already appearing, sufficiently expressive declarative languages for querying both RDF descriptions and schemas are still missing. In this paper, we propose a new RDF query language called RQL. It is a typed functional language a la OQL and relies on a formal model for directed labeled graphs permitting the interpretation of superimposed resource descriptions by means of one or more RDF schemas. RQL adapts the functionality of semistructured/XML query languages to the peculiarities of RDF but, foremost, it enables to uniformly query both resource descriptions and schemas. We illustrate the RQL syntax, semantics and typing system by means of a set of example queries and report on the performance of our persistent RDF Store employed by the RQL interpreter.

BibTeX record

@inproceedings{karvounarakis2002,
  abstract = {Real-scale Semantic Web applications, such as Knowledge Portals and E-Marketplaces, require the management of large volumes of metadata, i.e., information describing the available Web content and services. Better knowledge about their meaning, usage, accessibility or quality will considerably facilitate an automated processing of Web resources. The Resource Description Framework (RDF) enables the creation and exchange of metadata as normal Web data. Although voluminous RDF descriptions are already appearing, sufficiently expressive declarative languages for querying both RDF descriptions and schemas are still missing. In this paper, we propose a new RDF query language called RQL. It is a typed functional language (a la OQL) and relies on a formal model for directed labeled graphs permitting the interpretation of superimposed resource descriptions by means of one or more RDF schemas. RQL adapts the functionality of semistructured/XML query languages to the peculiarities of RDF but, foremost, it enables to uniformly query both resource descriptions and schemas. We illustrate the RQL syntax, semantics and typing system by means of a set of example queries and report on the performance of our persistent RDF Store employed by the RQL interpreter.},
  added-at = {2007-04-23T16:39:55.000+0200},
  address = {New York, NY, USA},
  author = {Karvounarakis, Gregory and Alexaki, Sofia and Christophides, Vassilis and Plexousakis, Dimitris and Scholl, Michel},
  biburl = {http://www.bibsonomy.org/bibtex/2cc75cf923e0677e1c00d4e0628de5eef/p_frischmuth},
  booktitle = {WWW '02: Proceedings of the 11th international conference on World Wide Web},
  interhash = {7eae2f630f6ca2e281b132cfda87e898},
  intrahash = {cc75cf923e0677e1c00d4e0628de5eef},
  keywords = {RDF RQL language query},
  pages = {592-603},
  publisher = {ACM Press},
  timestamp = {2007-04-23T16:39:55.000+0200},
  title = {RQL: A Declarative Query Language for RDF},
  url = {http://doi.acm.org/10.1145/511446.511524},
  year = 2002
}

Endnote record

%0 Conference Paper
%1 karvounarakis2002
%A Karvounarakis, Gregory
%A Alexaki, Sofia
%A Christophides, Vassilis
%A Plexousakis, Dimitris
%A Scholl, Michel
%B WWW '02: Proceedings of the 11th international conference on World Wide Web
%C New York, NY, USA
%D 2002
%I ACM Press
%K 
%P 592-603
%T RQL: A Declarative Query Language for RDF
%U http://doi.acm.org/10.1145/511446.511524
%X Real-scale Semantic Web applications, such as Knowledge Portals and E-Marketplaces, require the management of large volumes of metadata, i.e., information describing the available Web content and services. Better knowledge about their meaning, usage, accessibility or quality will considerably facilitate an automated processing of Web resources. The Resource Description Framework (RDF) enables the creation and exchange of metadata as normal Web data. Although voluminous RDF descriptions are already appearing, sufficiently expressive declarative languages for querying both RDF descriptions and schemas are still missing. In this paper, we propose a new RDF query language called RQL. It is a typed functional language (a la OQL) and relies on a formal model for directed labeled graphs permitting the interpretation of superimposed resource descriptions by means of one or more RDF schemas. RQL adapts the functionality of semistructured/XML query languages to the peculiarities of RDF but, foremost, it enables to uniformly query both resource descriptions and schemas. We illustrate the RQL syntax, semantics and typing system by means of a set of example queries and report on the performance of our persistent RDF Store employed by the RQL interpreter.

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RQL: A Declarative Query Language for RDF

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