Available as of Camel 2.7
If you use OSGi Blueprint then this only works from 2.11.1 or 2.10.5 onwards.
Previously it was only the
xs:string type attributes in the XML DSL that support placeholders. For example often a timeout attribute would be a
xs:int type and thus you cannot set a string value as the placeholder key. This is now possible from Camel 2.7 onwards using a special placeholder namespace.