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http://knoesis.org/sites/default/files/PJS11-SPARQLST-chapter.pdf
of spatial and temporal data.SPARQL, the W3C-recommended query language for RDF, does not adequately support complex spatial and temporal queries. In this work, we present the SPARQL-ST query language. SPARQL-ST is an extension of SPARQL for complex spatiotemporal queries. We present a formal syntax and se-mantics for SPARQL-ST.
http://docs.openlinksw.com/virtuoso/rdfsparqlimplementatioptragmas/
SPARQL-BI compiler and run-time support are not isolated from environment and some used heuristics are not perfect and sometimes different use cases require different behavior within same standard. These reasons are seen frequently in the industry, and the solution is well known: compiler pragmas.
https://github.com/eclipse/rdf4j/issues/71
May 11, 2016 · The only thing we don't really have full support for is serializing an AST back into a SPARQL query string. The SparqlQueryRenderer discussed in this issue has partial support, but as the ticket says, it's never been updated to deal with SPARQL 1.1.
http://virtuoso.openlinksw.com/dataspace/dav/wiki/Main/VOSArticleBISPARQL2
We discuss extending SPARQL for business intelligence (BI) workloads and relate experiences on running SPARQL against relational and native RDF databases. We use the well known TPC-H benchmark as our reference schema and workload. We define a mapping of the TPC-H schema to RDF and restate the queries as BI extended SPARQL.
https://www.researchgate.net/publication/308057797_Querying_Linked_Building_Data_Using_SPARQL_with_Functional_Extensions
Querying Linked Building Data Using SPARQL with Functional Extensions Conference Paper (PDF Available) · September 2016 with 642 Reads How we measure 'reads'
https://ideas.powerbi.com/forums/265200-power-bi-ideas/suggestions/10612626-support-sparql-endpoints
Hey Matt, I recently wrote an article showing how to explore a semantic web of linked data with PowerBI and Virtuoso Universal Server. Virtuoso makes this work by extending SQL with SPARQL; in this case, by putting a SPARQL query into a SQL FROM clause.
http://www.earthobservatory.eu/geospatial-extensions-for-rdf-and-sparql
The data model stRDF and the query language stSPARQL are extensions of the standards RDF and SPARQL 1.1 respectively for representing and querying geospatial data that changes over time. stRDF and stSPARQL use the widely adopted OGC standards Well Known Text (WKT) and Geography Markup Language (GML) to represent geospatial data.
http://docs.openlinksw.com/virtuoso/sparqlbi/
Virtuoso extends SPARQL with expressions in results, subqueries, aggregates and grouping. These extensions allow a straightforward translation of arbitrary SQL queries to SPARQL. This extension is called "SPARQL BI", because the primary objective is to match needs of Business Intelligence.
https://jena.apache.org/documentation/query/extension.html
The free text support in ARQ is provided by Lucene, using property functions. Filter Functions¶ A SPARQL custom function is implementation dependent. Most details of the ARQ query engine do not have to be understood to write a function; it is a matter of implementing one interface.
https://www.w3.org/2009/sparql/wiki/Extensions_Proposed_By_OpenLink
To support this, SPARQL must match and exceed SQL in all capabilities proper to SQL in addition to providing access to semantically rich data, inference and so forth. In light of this, OpenLink has implemented numerous extensions to SPARQL, of which we offer some for consideration to the SPARQL 2.0 WG.
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