74.9.

Namespaces ns = new Namespaces("c", "http://acme.com/cheese");

from("direct:start")
    .filter(xpath("/c:person[@name='James']", ns))
        .to("mock:result");

/c:person[@name='James']

Namespaces ns = new Namespaces("c", "http://acme.com/cheese")
                     .add("w", "http://acme.com/wine")
                     .add("b", "http://acme.com/beer");

<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.xsd
       http://camel.apache.org/schema/spring http://camel.apache.org/schema/spring/camel-spring.xsd
    ">

  <camelContext xmlns="http://camel.apache.org/schema/spring">
    <route>
      <from uri="direct:start"/>
      <filter>
        <xpath logNamespaces="true">/foo:person[@name='James']</xpath>
        <to uri="mock:result"/>
      </filter>
    </route>
  </camelContext>

</beans>