This page contains a link to the XML reference guides and XML schema documents for Xml Configuration with Camel releases. You can refer to http://camel.apache.org/schema/ to see the individual XSDs available.
When you are using Spring's 2.5 XML handling to parse the XML then you need to refer to the XSD locations in your XML document.
You can refer to a specific version of the XSD in your XML as follows
or if you prefer you can use a generic XSD without the version number
Your IDE won't be able to fetch this XSD, you'll have to manually associate a specific release; however it does mean that you won't have to upgrade your XML config file with each Camel release; as it will resolve this XSD using the bundled XSD inside the camel-spring.jar.