Implementing IRecursiveElementProcessor


I've been digging into ReSharper's OpenAPI and wanted to implement IRecursiveElementProcessor interface. I've found the sample implementation in CyclomaticComplexity plugin, and it's ok.
I wanted to know is what is the 'Interior' in the interfaces function name referring to?
Can you also explain in few words the four functions I'm supposed to implement?

Thanks in advance,

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