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Introduction

This chapter provides an overview of all the expression languages supported by Apache Camel.

Overview of the Languages
How to Invoke an Expression Language

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Contents
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Introduction
- Overview of the Languages
- How to Invoke an Expression Language
Constant
EL
The File Language
- When to Use the File Language
- File Variables
- Examples
Groovy
Header
JavaScript
JoSQL
JXPath
MVEL
The Object-Graph Navigation Language(OGNL)
PHP
Property
Python
Ref
Ruby
The Simple Language
- Java DSL
- XML DSL
- Expressions
- Predicates
- Variable Reference
- Operator Reference
SpEL
The XPath Language
- Java DSL
- XML DSL
- XPath Injection
- XPath Builder
- Enabling Saxon
- Expressions
- Predicates
- Using Variables and Functions
- Variable Namespaces
- Function Reference
XQuery

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