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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.

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

from("queue:foo").filter().
  xquery("//foo")).
  to("queue:bar")

In earlier versions of Camel you had to use theXQueryBuilder To add an XQuery expression to your routing rules its usually easiest to import the XQueryBuilder classes methods then you can use the xquery() function inside your rules.

import static org.apache.camel.builder.saxon.XQueryBuilder.*;

...


from("queue:foo").
  filter(xquery("//foo")).
  to("queue:bar")

Examples

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

{snippet:id=example|lang=java|url=activemq/camel/trunk/components/camel-saxon/src/test/java/org/apache/camel/builder/saxon/XQueryFilterTest.java}

This example uses XQuery with namespaces as a predicate in a Message Filter

{snippet:id=example|lang=java|url=activemq/camel/trunk/components/camel-saxon/src/test/java/org/apache/camel/builder/saxon/XQueryWithNamespacesFilterTest.java}