Converts to XML
img: gifti.GiftiImage or surf :
Input surface
meta_fn_hint: str or None :
If not None, it should be a string (possibly a filename that describes what kind of surface this is. See filename2vertices_faces_metadata.
xml: bytearray :
Representation of input surface in XML format
mvpa2.support.nibabel.surf_gifti.to_gifti_image
mvpa2.support.nibabel.surf_gifti.write
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