---
name: "Attean::API::AggregateExpression"
section: "3pm"
platform: "linux"
package: "libattean-perl"
version: "0.035-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/Attean::API::AggregateExpression"
---

# Attean::API::AggregateExpression(3pm)

Role representing an aggregate expression tree

## NAME

Attean::API::AggregateExpression - Role representing an aggregate expression tree

## VERSION

This document describes Attean::API::AggregateExpression version 0.035

## SYNOPSIS

```
  use v5.14;
  use Attean;
```

## DESCRIPTION

This is a Moo role representing aggregate expressions.

## ROLES

This role consumes Attean::API::DirectedAcyclicGraph.

## REQUIRED METHODS

Classes consuming this role must provide the following methods:

- operator()

  The name of the aggregate operator.

- scalar\_vars()

  A HASH reference of scalar variables. The only scalar variable defined for SPARQL 1.1 is `'seperator'`, a string separator used with the GROUP\_CONCAT aggregate.

## BUGS

Please report any bugs or feature requests to through the GitHub web interface at \<https://github.com/kasei/attean/issues\>.

## SEE ALSO

## AUTHOR

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

## COPYRIGHT

Copyright (c) 2014--2022 Gregory Todd Williams. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.