]> 2012-02-10T15:38:47-05:00 Quilitz2008querying question 1 by lebo The authors state, "There is no other need for cooperation except of the support of the SPARQL protocol." Yet later, "To find the relevant information sources for the different triples in a query and to decompose the query into sub-queries the query engine needs information about the data sources." DARQ relies on the ''service descriptions'' to determine how to decompose the query. # How do the service descriptions not require cooperation to obtain the capabilities <math>C_D</math> of a data source D? "We deliberately use only these simple statistics because '''we expect every data source to be able to provide them''', or '''at least''' rough estimations." The authors state, "There is no other need for cooperation except of the support of the SPARQL protocol." Yet later, "To find the relevant information sources for the different triples in a query and to decompose the query into sub-queries the query engine needs information about the data sources." DARQ relies on the ''service descriptions'' to determine how to decompose the query. # How do the service descriptions not require cooperation to obtain the capabilities <math>C_D</math> of a data source D? "We deliberately use only these simple statistics because '''we expect every data source to be able to provide them''', or '''at least''' rough estimations." Text Ankesh Sep11 Question for the Presentation Question asked by Question asked User:Tim Lebo Author Quilitz2008querying About Question A