SPARQL and RDF aggregate functions - "RDF aggregate queries and views"

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  • warning: Parameter 1 to theme_field() expected to be a reference, value given in /var/www/drupal/includes/theme.inc on line 171.
  • warning: Parameter 1 to theme_field() expected to be a reference, value given in /var/www/drupal/includes/theme.inc on line 171.
  • warning: Parameter 1 to theme_field() expected to be a reference, value given in /var/www/drupal/includes/theme.inc on line 171.

The University of Maryland, home of DAML and James Hendler and a lot of the Semantic Web efforts has a good algorithm for doing aggregate functions. Very academic paper, showing some of the challenges, but also showing it is not impossible for Sparql to have aggregate functions.