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Extracting lens_info from makernote

I am sorry to ask such a naive question, but what I need is to extract tags under makernote of the raw image such as the CameraFormat, etc.

How can I accomplish this? For instance I could access the whole XMP data by LibRaw.imgdata.idata.xmpdata I was wondering how to access the parameters in libraw_makernotes_lens_t structure.