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Variables in XPath is defined in different namespaces. The default namespace is http://camel.apache.org/schema/springImage Removed.

Namespace URI	Local part	Type	Description
http://camel.apache.org/xml/in/Image Removed	in	Message	the exchange.in message
http://camel.apache.org/xml/out/Image Removed	out	Message	the exchange.out message
http://camel.apache.org/xml/function/Image Removed	functions	Object	Camel 2.5: Additional functions
http://camel.apache.org/xml/variables/environment-variablesImage Removed	env	Object	OS environment variables
http://camel.apache.org/xml/variables/system-propertiesImage Removed	system	Object	Java System properties
http://camel.apache.org/xml/variables/exchange-propertyImage Removed		Object	the exchange property

Camel will resolve variables according to either:

• namespace given
• no namespace given

Namespace given

If the namespace is given then Camel is instructed exactly what to return. However when resolving either in or out Camel will try to resolve a header with the given local part first, and return it. If the local part has the value body then the body is returned instead.

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If there is no namespace given then Camel resolves only based on the local part. Camel will try to resolve a variable in the following steps:

• from variables that has been set using the variable(name, value) fluent builder
• from message.in.header if there is a header with the given key
• from exchange.properties if there is a property with the given key

Functions

Camel adds the following XPath functions that can be used to access the exchange:

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