Numbering Part
Numbering information in a WordprocessingML document is stored in the Numbering 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/numbering
and has a content type of vnd-openxmlformats.officedocument.wordprocessingml-numbering+xml
.