---
name: "RDF::Query::Expression"
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::Expression"
---

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

Class for Expr expressions

## NAME

RDF::Query::Expression - Class for Expr expressions

## VERSION

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

## METHODS

- "new ( $op, @operands )"

  Returns a new Expr structure.

- "construct\_args"

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

- "op"

  Returns the operator of the expression.

- "operands"

  Returns a list of the operands of the expression.

- "sse"

  Returns the SSE string for this algebra expression.

- "explain"

  Returns a string serialization of the expression appropriate for display on the command line. This method is primarily used by the `"explain"` method of the subclasses of RDF::Query::Plan.

- "as\_hash"

  Returns the expression 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.

- "nonaggregated\_referenced\_variables"

  Returns a list of the variable names used in this algebra expression except those used as aliases for aggregate operations.

## AUTHOR

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