Execute a service. On success returns a string created from the service. By default, the string is a representation in XML, other formats such as Turtle and N3 could be returned by adding the output format from the list of optional parameters. Returns an error message on failure. SPARUL and SPARQL can be performed.
Find all possible values for a query of type SELECT and may return several lists of
BindingValue. URI, Literal and Blank Nodes are now types in Haskell. If it fails returns an error message.