The From EIP supports 1 options which are listed below:
Required Sets the URI of the endpoint to use
Start a route with the File endpoint. Each file in the directory creates an exchange that is put into the camel route.
A camel route is started using from inside the configure method of the class RouteBuilder
And examples in Spring XML Schema:
The route is defined inside a CamelContext.
<route> <from uri="file:c:/in" /> </route>