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http://hdl.handle.net/1942/33422
Title: | Principles of Guarded Structural Indexing | Authors: | Picalausa, François Fletcher, George Hidders, Jan VANSUMMEREN, Stijn |
Issue Date: | 2014 | Publisher: | Openproceedings.org | Source: | Proc. 17th International Conference on Database Theory (ICDT), Athens, Greece, March 24-28, 2014, Openproceedings.org, p. 245 -256 | Abstract: | We present a new structural characterization of the expressive power of the acyclic conjunctive queries in terms of guarded simulations, and give a finite preservation theorem for the guarded simulation invariant fragment of first order logic. We discuss the relevance of these results as a formal basis for constructing so-called guarded structural indexes. Structural indexes were first proposed in the context of semi-structured query languages and later successfully applied as an XML indexation mechanism for XPath-like queries on trees and graphs. Guarded structural indexes provide a generalization of structural indexes from graph databases to relational databases. | Keywords: | F41 [Mathematical Logic and Formal Languages]: Mathematical Logic;H23 [Database Management]: Languages-Query languages;H24 [Database Manage- ment]: Systems-Query processing;H31 [Information Storage and Retrieval]: Content Analysis and Indexing- Indexing Methods General Terms Design, Languages, Theory Keywords Acyclicity, conjunctive queries, guarded simulation, fact sim- ulation, finite preservation theorems, hypergraph | Document URI: | http://hdl.handle.net/1942/33422 | Link to publication/dataset: | https://openproceedings.org/ICDT/2014/paper_74.pdf | ISBN: | 978-3-89318066-1 | DOI: | 10.5441/002/icdt.2014.26 | Category: | C1 | Type: | Proceedings Paper |
Appears in Collections: | Research publications |
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paper_74.pdf | Published version | 2.14 MB | Adobe PDF | View/Open |
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