The OBANOTE statement assigns an object footer note to the Attributes#1 entry. See Global Title, Global Footnote, Subtitle, Object Heading Note, Object Footer Note, and Note
The DIR statement changes the current file location to \Contents#1\DataSet#1.
proc document name=class; dir \Contents#1\DataSet#1; run; obanote Attributes#1 'Object Footer Note Specified by the OBANOTE Statement'; run; quit;