---
name: "RDF::Query::Algebra::Filter"
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::Filter"
---

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

Algebra class for Filter expressions

## NAME

RDF::Query::Algebra::Filter - Algebra class for Filter expressions

## VERSION

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

## METHODS

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

- "new ( $expression, $pattern )"

  Returns a new Filter structure.

- "construct\_args"

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

- "expr"

  Returns the filter expression.

- "pattern"

  Returns the filter pattern.

- "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).

- "as\_spin ( $model )"

  Adds statements to the given model to represent this algebra object in the SPARQL Inferencing Notation (\<http://www.spinrdf.org/\>).

- "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.

- "is\_solution\_modifier"

  Returns true if this node is a solution modifier.

## AUTHOR

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