[Paraview] Reader methods question

[Felipe Bordeu]

Hello,

I am a little confuse about all the methods in a reader (filter).
I writing a new reader (I already read all the wiki pages) that can 
generate Un/Structured grids depending on the file.

But I am not sure about what to put in each method.

ProcessRequest(...
RequestDataObject(...
RequestData(...
RequestUpdateExtent(...
RequestInformation(...
FillOutputPortInformation(..

I know RequesInformation(.. is for the type of output and the extend(in 
the case is structured).
and I Know RequestData(... if for the generated data.

Thanks for the help.

-- 

Felipe