- Abstract:
-
SPARQL is the standard query language for RDF data. The distinctive feature of SPARQL is the OPTIONAL operator, which allows for partial answers when complete answers are not available due to lack of information. However, optional matching is computationally expensive—query answering is PSPACE-complete. The well-designed fragment of SPARQL achieves much better computational properties by restricting the use of optional matching—query answering becomes coNP-complete. On the downside, well-desi...
Expand abstract - Publication status:
- Published
- Peer review status:
- Peer reviewed
- Version:
- Publisher's version
- Files:
-
-
(pdf, 1.7MB)
-
- Publisher copy:
- 10.1007/s00224-017-9802-9
-
Version unsuitable
-
We have not obtained a suitable full-text for a given research output. See this page for more information.
-
Recently completed
-
Sometimes content is held in ORA but is unavailable for a fixed period of time to comply with the policies and wishes of rights holders.
-
Permissions
-
All content made available in ORA should comply with relevant rights, such as copyright. See this page for more information.
-
Clearance
-
Some thesis volumes scanned as part of the digitisation scheme funded by Dr Leonard Polonsky are currently unavailable due to sensitive material or uncleared third-party copyright content. We are attempting to contact authors whose theses are affected.
- Grant:
- projects Score!, DBOnto, and ED3
- Publisher:
- Springer US Publisher's website
- Journal:
- Theory of Computing Systems Journal website
- Volume:
- 62
- Issue:
- 4
- Pages:
- 772–809
- Publication date:
- 2017-08-14
- Acceptance date:
- 2017-06-29
- DOI:
- EISSN:
-
1433-0490
- ISSN:
-
1432-4350
- Pubs id:
-
pubs:702204
- URN:
-
uri:18e702c1-2a0a-44f7-9376-46d58a79892d
- UUID:
-
uuid:18e702c1-2a0a-44f7-9376-46d58a79892d
- Local pid:
- pubs:702204
- Keywords:
- Copyright holder:
- Kaminski and Kostylev
- Copyright date:
- 2017
- Notes:
-
Copyright © 2017 The Authors.
This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Journal article
Complexity and expressive power of weakly well-designed SPARQL
Actions
Access Document
Why is the content I wish to access not available via ORA?
Bibliographic data (the information relating to research outputs) and full-text items (e.g. articles, theses, reports, etc.) arrive in ORA from several different sources. Unfortunately we are not able to make available the full-text for every research output.
Please contact the ORA team (
) if you have queries regarding unavailable content OR if you are aware of a full-text copy we can make available.
) if you have queries regarding unavailable content OR if you are aware of a full-text copy we can make available.
Content may be unavailable for the following four reasons
Alternative access to the full-text
You may be able to access the full-text directly from the publisher's website using the 'Publisher Copy' link in the 'Links & Downloads' box from a research output's ORA record page. This method may require an institutional or individual subscription to the journal/resource.
Authors
Funding
+ Engineering and Physical Sciences Research Council
More from this funder
Bibliographic Details
Item Description
Terms of use
If you are the owner of this record, you can report an update to it here: Report update to this record