Footnote Part
Footnote information in a WordprocessingML document is stored in the footnotes part within the package, which is stored via an implicit relationship from the Main Document part or Glossary Document part of relationship type http://schemas.openxmlformats.org/wordprocessingml/2006/footnotes
and has a content type of vnd-openxmlformats.officedocument.wordprocessingml-footnotes+xml
.