NAME¶
RDF::Query::Algebra::Service - Algebra class for SERVICE (federation) patterns
VERSION¶
This document describes RDF::Query::Algebra::Service version 2.908.
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.
- "add_bloom ( $variable, $filter )"
- Adds a FILTER to the enclosed GroupGraphPattern to restrict
values of the named $variable to the values encoded in the $filter (a
Bloom::Filter object).
- "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>