---
name: "RDF::Query::Federate"
section: "3pm"
platform: "linux"
package: "librdf-query-perl"
version: "2.919-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/RDF::Query::Federate"
---

# RDF::Query::Federate(3pm)

A subclass of RDF::Query for efficient federated query execution.

## NAME

RDF::Query::Federate - A subclass of RDF::Query for efficient federated query execution.

## VERSION

This document describes RDF::Query::Federate version 2.919.

## STATUS

This module's API and functionality should be considered deprecated. If you need functionality that this module provides, please get in touch \<http://www.perlrdf.org/\>.

## SYNOPSIS

```
 my $service = RDF::Query::ServiceDescription->new( $url );
 my $query = new RDF::Query::Federate ( $sparql );
 $query->add_service( $service );
 my $stream = $query->execute();
```

## DESCRIPTION

...

## METHODS

- "new ( $query, \\%options )"

  - "new ( $query, $base\_uri, $languri, $lang )"

  Returns a new RDF::Query::Federate object for the specified `$query`. The query language defaults to SPARQLP, but may be set specifically by specifying either `$languri` or `$lang`, whose acceptable values are:

  ```
    $lang: 'rdql', 'sparql11', or 'sparql'
    $languri: 'http://www.w3.org/TR/rdf-sparql-query/', or 'http://jena.hpl.hp.com/2003/07/query/RDQL'
  ```

- "add\_service ( $service\_description )"

  Adds the service described by `$service_description` to the query's list of data sources.

- "services"

  - "algebra\_fixup ( $algebra, $bridge, $base\_uri, $ns )"

  Called in the fixup method of ::Algebra classes, returns either an optimized ::Algebra object ready for execution, or undef (in which case it will be prepared for execution by the ::Algebra::\* class itself.

## AUTHOR

```
 Gregory Todd Williams <gwilliams@cpan.org>
```