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Camel supports XQuery to allow an Expression or Predicate to be used in the DSL or Xml Configuration. For example you could use XQuery to create an Predicate in a Message Filter or as an Expression for a Recipient List.

To enable XQuery support you need the camel-saxon library to be on your classpath.

From 1.3 of Camel onwards you can use XQuery expressions directly using smart completion in your IDE as follows

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Code Block
import static org.apache.camel.builder.saxon.XQueryBuilder.*; ... from("queue:foo"). filter(xquery("//foo")). to("queue:bar")

Using XML configuration

If you prefer to configure your routes in your Spring XML file then you can use XPath expressions as follows

Code Block

lang	xml


<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:foo="http://example.com/person"
       xsi:schemaLocation="
       http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
       http://activemq.apache.org/camel/schema/spring http://activemq.apache.org/camel/schema/spring/camel-spring.xsd">

  <camelContext id="camel" xmlns="http://activemq.apache.org/camel/schema/spring">
    <route>
      <from uri="activemq:MyQueue"/>
      <filter>
        <xquery>/foo:person[@name='James']</xquery>
        <to uri="mqseries:SomeOtherQueue"/>
      </filter>
    </route>
  </camelContext>
</beans>

Notice how we can reuse the namespace prefixes, foo in this case, in the XPath expression for easier namespace based XQuery expressions!

Examples

Here is a simple example using an XQuery expression as a predicate in a Message Filter

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Old Version 4

New Version 5

Key

Using XML configuration

Examples