@inproceedings{lope-etal-2011COLA,
	Abstract = {XSPARQL is a transformation and query language that caters for heterogenous sources: in its present status it is
  possible to transform data between XML and RDF formats due to the integration of the XQuery and SPARQL query
  languages.  In this paper we propose an extension of the XSPARQL language to incorporate data contained in relational
  databases by integrating a subset of SQL in the syntax of XSPARQL.
  Exposing data contained in relational databases as RDF is a necessary step towards the realisation of the Semantic Web
  and Web of Data.
  We present the syntax of an extension of the XSPARQL language catering for the inclusion of the SQL query language along
  with the semantics based on the XQuery formal semantics and sketch how this extended XSPARQL language can be used to
  expose RDB2RDF mappings, as currently being discussed in the W3C RDB2RDF Working Group.},
	Address = {Lisbon, Portugal},
	Author = {Nuno Lopes and Stefan Bischof and Axel Polleres},
	Booktitle = {Proceedings of the 15th Portuguese Conference on Artificial Intelligence (EPIA2011) -- Computational Logic with Applications Track},
	Day = {10--13},
	Month = oct,
	Projects = {lion2},
	Title = {On the Semantics of Heterogeneous Querying of Relational, {XML}, and {RDF} Data with {XSPARQL}},
	Type = CONF,
	Url = {http://www.polleres.net/publications/lope-etal-2011EPIA.pdf},
	Year = 2011,
	Bdsk-Url-1 = {http://www.polleres.net/publications/lope-etal-2011EPIA.pdf}}

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Exposing data contained in relational databases as RDF is a necessary step towards the realisation of the Semantic Web and Web of Data. 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