@inproceedings{poll-etal-2016AMW,
	Title = {Nested Constructs vs. Sub-Selects in {SPARQL}},
	Author = {Axel Polleres and Juan Reutter and Egor V. Kostylev},
	Booktitle = {Alberto Mendelzon International Workshop on Foundations of Data Management (AMW2016)},
	Month = jun,
        Day = {6--10},
	Year = 2016,
        Address = {Panama City, Panama},
	Abstract = {The issue of subqueries in SPARQL has appeared in different papers as an extension point to the original SPARQL query language. Particularly, nested CONSTRUCT in FROM clauses are a feature that has been discussed as a potential input for SPARQL 1.1 which was resolved to be left out in favour of select subqueries under the -- unproven -- conjecture that such subqueries can express nested construct queries. In this paper, we show that it is indeed possible to unfold nested SPARQL construct queries into subqueries in SPARQL 1.1; our transformation, however, requires an exponential blowup in the nesting depth. This suggests that nested construct queries are indeed a useful syntactic feature in SPARQL that cannot compactly be replaced by subqueries.},
	Type = WS,
         url = {http://polleres.net/publications/poll-etal-2016AMW.pdf},
}

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