'Processing British National Corpus (BNC) with NLTk: How to keep spoken texts only?

Following this old(er) post HERE, I wonder if one can keep (extract) spoken samples only? There is a special XML tag (element): is used to represent a spoken text, as explained in the Reference Guide (which can be found HERE).

python nltk

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'Processing British National Corpus (BNC) with NLTk: How to keep spoken texts only?

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