migrating to cocoon 3.0

I have few components written against cocoon 2.2.
For example, extending those classes:

FileGenerator
TraxTransformer
AbstractInputModule


I am looking to port them to 3.0, but can not find a reference for the
components. I can see here some components, but no examples and not
even the classes.
http://cocoon.apache.org/3.0/reference/html/pipelines.html#d0e363

Is there a place where I can get the help I need ??

Thank you.