Please use this identifier to cite or link to this item:
http://hdl.handle.net/1942/21032
Full metadata record
DC Field | Value | Language |
---|---|---|
dc.contributor.author | HELLINGS, Jelle | - |
dc.contributor.author | GYSSENS, Marc | - |
dc.contributor.author | Wu, Yuqing | - |
dc.contributor.author | Van Gucht, Dirk | - |
dc.contributor.author | VAN DEN BUSSCHE, Jan | - |
dc.contributor.author | VANSUMMEREN, Stijn | - |
dc.contributor.author | Fletcher, George H. L. | - |
dc.date.accessioned | 2016-04-25T08:06:20Z | - |
dc.date.available | 2016-04-25T08:06:20Z | - |
dc.date.issued | 2015 | - |
dc.identifier.citation | Cheney, James; Neumann, Thomas (Ed.). Proceedings of the 15th Symposium on Database Programming Languages, p. 59-68 | - |
dc.identifier.isbn | 978-1-4503-3902-5 | - |
dc.identifier.uri | http://hdl.handle.net/1942/21032 | - |
dc.description.abstract | Motivated by the continuing interest in the tree data model, we study the expressive power of downward fragments of navigational query languages on trees. The basic navigational query language we consider expresses queries by building binary relations from the edge relations and the identity relation, using composition and union. We study the effects on the expressive power when we add transitive closure, projections, coprojections, intersection, and difference. We study expressiveness at the level of boolean queries and path queries, on labeled and unlabeled trees, and on labeled and unlabeled chains. In all these cases, we are able to present the complete Hasse diagram of relative expressiveness. In particular, we were able to decide, for each fragment of the navigational query languages that we study, whether it is closed under difference and intersection when applied on trees. | - |
dc.language.iso | en | - |
dc.publisher | ACM | - |
dc.rights | Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from Permissions@acm.org. Copyright is held by the owner/author(s). Publication rights licensed to ACM. | - |
dc.subject.other | tree queries; expressive power; automata | - |
dc.title | Relative expressive power of downward fragments of navigational query languages on trees and chains | - |
dc.type | Proceedings Paper | - |
local.bibliographicCitation.authors | Cheney, James | - |
local.bibliographicCitation.authors | Neumann, Thomas | - |
local.bibliographicCitation.conferencedate | 23/10/2015-30/10-2015 | - |
local.bibliographicCitation.conferencename | DBPL 2015 | - |
local.bibliographicCitation.conferenceplace | Pittsburgh, Pennsylvania, United States | - |
dc.identifier.epage | 68 | - |
dc.identifier.spage | 59 | - |
local.format.pages | 59-68 | - |
local.bibliographicCitation.jcat | C1 | - |
local.publisher.place | New York, NY, USA | - |
local.type.refereed | Refereed | - |
local.type.specified | Proceedings Paper | - |
dc.identifier.doi | 10.1145/2815072.2815081 | - |
dc.identifier.url | http://jhellings.nl/files/dbpl2015_paper.pdf | - |
local.bibliographicCitation.btitle | Proceedings of the 15th Symposium on Database Programming Languages | - |
item.contributor | HELLINGS, Jelle | - |
item.contributor | GYSSENS, Marc | - |
item.contributor | Wu, Yuqing | - |
item.contributor | Van Gucht, Dirk | - |
item.contributor | VAN DEN BUSSCHE, Jan | - |
item.contributor | VANSUMMEREN, Stijn | - |
item.contributor | Fletcher, George H. L. | - |
item.fulltext | With Fulltext | - |
item.fullcitation | HELLINGS, Jelle; GYSSENS, Marc; Wu, Yuqing; Van Gucht, Dirk; VAN DEN BUSSCHE, Jan; VANSUMMEREN, Stijn & Fletcher, George H. L. (2015) Relative expressive power of downward fragments of navigational query languages on trees and chains. In: Cheney, James; Neumann, Thomas (Ed.). Proceedings of the 15th Symposium on Database Programming Languages, p. 59-68. | - |
item.accessRights | Open Access | - |
Appears in Collections: | Research publications |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
p59-hellings.pdf Restricted Access | Published version | 425.41 kB | Adobe PDF | View/Open Request a copy |
dbpl2015_paper.pdf | Peer-reviewed author version | 394.09 kB | Adobe PDF | View/Open |
SCOPUSTM
Citations
3
checked on Sep 2, 2020
Page view(s)
60
checked on Sep 7, 2022
Download(s)
182
checked on Sep 7, 2022
Google ScholarTM
Check
Altmetric
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.