---
name: "RDF::Query::Algebra::Quad"
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::Algebra::Quad"
---

# RDF::Query::Algebra::Quad(3pm)

Algebra class for Quad patterns

## NAME

RDF::Query::Algebra::Quad - Algebra class for Quad patterns

## VERSION

This document describes RDF::Query::Algebra::Quad version 2.919.

## METHODS

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

- "new ( $s, $p, $o, $g )"

  Returns a new Quad structure.

- "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).

- "referenced\_blanks"

  Returns a list of the blank node names used in 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`.

- "bf ()"

  Returns a string representing the state of the nodes of the triple (bound or free).

- "distinguish\_bnode\_variables"

  Returns a new Quad object with blank nodes replaced by distinguished variables.

- "label ( $label =\> $value )"

  Sets the named `$label` to `$value` for this quad object. If no `$value` is given, returns the current label value, or undef if none exists.

## AUTHOR

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