toggle visibility Search & Display Options

Select All    Deselect All
 |   | 
Details
   print
  Records Links
Author Mosser, M., Pieressa, F., Reutter, JL., Soto, A., Vrgoc, D. doi  openurl
  Title Querying APIs with SPARQL Type
  Year 2022 Publication Information Systems Abbreviated Journal Inf. Syst.  
  Volume 105 Issue Pages 101650  
  Keywords SPARQL; Semantic web; SERVICE; JSON; API  
  Abstract Although the amount of RDF data has been steadily increasing over the years, the majority of information on the Web is still residing in other formats, and is often not accessible to Semantic Web services. A lot of this data is available through APIs serving JSON documents. In this work we propose a way of extending SPARQL with the option to consume JSON APIs and integrate this information into SPARQL query answers, obtaining a language that combines data from the �traditional� Web to the Semantic Web. Our proposal is based on an extension of the SERVICE operator with the ability to connect to JSON APIs. With the aim of evaluating these queries as efficiently as possible, we show that the main bottleneck is the amount of API requests, and present an algorithm that produces �worst-case optimal� query plans that reduce the number of requests as much as possible. We note that the analysis of this algorithm is by a reduction to an algorithm for evaluating relational queries with access methods with the minimal number of access queries, which is of independent interest. We show the superiority of the worst-case optimal approach in a series of experiments that take existing SPARQL benchmarks, and augment them with the ability to connect to JSON APIs in order to obtain additional information.  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0306-4379 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000740349400006 Approved  
  Call Number UAI @ alexi.delcanto @ Serial 1255  
Permanent link to this record
 

 
Author Reutter, J., Soto, A., Vrgoc, D. doi  openurl
  Title Recursion in SPARQL Type
  Year 2021 Publication Semantic Web Abbreviated Journal Semant. Web  
  Volume 12 Issue 5 Pages 711-740  
  Keywords SPARQL, Recursive Queries, Property Paths  
  Abstract The need for recursive queries in the Semantic Web setting is becoming more and more apparent with the emergence of datasets where different pieces of information are connected by complicated patterns. This was acknowledged by the W3C

committee by the inclusion of property paths in the SPARQL standard. However, as more data becomes available, it is becoming clear that property paths alone are not enough to capture all recursive queries that the users are interested in. In this paper we propose a general purpose recursion operator to be added to SPARQL, formalize its syntax and develop algorithms for evaluating it in practical scenarios. We also show how to implement it as a plug-in on top of existing systems and test its performance on several real world datasets.
 
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1570-0844 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000692019600001 Approved  
  Call Number UAI @ alexi.delcanto @ Serial 1256  
Permanent link to this record
Select All    Deselect All
 |   | 
Details
   print

Save Citations:
Export Records: