---
title: Query extension language
slug: '1415'
canonical_url: https://docs.coveo.com/en/1415/
collection: glossary
source_format: adoc
---
# Query extension language
The {doctitle} is an advanced [Coveo query syntax](https://docs.coveo.com/en/181/) feature which consists of a set of standard [query extensions](https://docs.coveo.com/en/1397/).
Administrators and developers can use these extensions to formulate complex [query](https://docs.coveo.com/en/231/) expressions, typically based on contextual information.