The below configuration which is also depicited in the Hello World example shows you how to configure endpoints at Component level.  This is the simplest form of defining a endpoint. Here the component GreeterUMO would receive the event by configuring the attribute named inboundEndpoint. Similarly the component GreeterUMO would send the event by configuring the outboundEndpoint attribute.  

<mule-descriptor
name="GreeterUMO"
inboundEndpoint="stream://System.in"
inboundTransformer="StringToNameString"
outboundEndpoint="vm://chitchatter"
implementation="org.mule.samples.hello.Greeter">
</mule-descriptor>