Also, subqueries are undoubtedly one of the signs of the semantic complexity of queries, therefore we count the number of subqueries in each query. We further consider the presence of JOINs since a ...

GitHub is where people build software. More than 150 million people use GitHub to discover, fork, and contribute to over 420 million projects.

The introduction of subqueries is one of the most interesting features included in the latest SPARQL 1.1 specification. Existing distributed RDF storage and querying systems have not studied the ...

Subqueries can be introduced with one of the comparison operators (=, < >, >, > =, <, ! >, ! <, or < =). A subquery introduced with an unmodified comparison operator (a comparison operator not ...

XML is often used to represent objects that expose different sets of properties. This "property bag" scenario is a prominent use case for the XML support added to Microsoft SQL Server 2005. However, ...