Creating a new extractor from a new Model

[midoscofield]

Hello,
I want create a new model in order to map the new types with my custom extractor(new extractor).so after my research i find this demarche:
1-custom-Model.xml the new model have to be created in extension folder
2-custom-model-context.xml for registration of the new model (extension folder)
3-myextractor.java  the new extractor which i don't know where should be created?is it in the extension folder?
4-custom-metadata-extractor-context.xml  to remote the extractor class
5-web-client-config-custom.xml  to incorporate the model into the web client

Is it correct as approach?And where i should put the extractor class?

Thanks

[midoscofield]

Hello,
Any idea of how to extract and map a new metadata from a pair of files: PDF(scanned doc) +XML file(contain the metadata)?