NAME

       RDF::Query::Algebra::Service - Algebra class for SERVICE (federation) patterns

VERSION

       This document describes RDF::Query::Algebra::Service version 2.910.

METHODS

       Beyond the methods documented below, this class inherits methods from the
       RDF::Query::Algebra class.

       "new ( $endpoint, $pattern, $silent )"
           Returns a new Service structure.

       "construct_args"
           Returns a list of arguments that, passed to this class' constructor, will produce a
           clone of this algebra pattern.

       "endpoint"
           Returns the endpoint resource of the named graph expression.

       "pattern"
           Returns the graph pattern of the named graph expression.

       "silent"
           Returns true if the service operation is to ignore errors during execution.

       "lhs"
           If the SERVCE operation uses a variable endpoint, then it is considered a binary
           operator, executing the left-hand-side pattern first, and using results from it to
           bind endpoint URL values to use in SERVICE evaluation.

       "sse"
           Returns the SSE string for this algebra expression.

       "as_sparql"
           Returns the SPARQL string for this algebra expression.

       "as_hash"
           Returns the query as a nested set of plain data structures (no objects).

       "type"
           Returns the type of this algebra expression.

       "referenced_variables"
           Returns a list of the variable names used in this algebra expression.

       "potentially_bound"
           Returns a list of the variable names used in this algebra expression that will bind
           values during execution.

       "definite_variables"
           Returns a list of the variable names that will be bound after evaluating this algebra
           expression.

       "qualify_uris ( \%namespaces, $base_uri )"
           Returns a new algebra pattern where all referenced Resource nodes representing QNames
           (ns:local) are qualified using the supplied %namespaces.

AUTHOR

        Gregory Todd Williams <gwilliams@cpan.org>