Styles Part
Style information in a WordprocessingML document is stored in the Styles part within the package, which is stored via an implicit relationship from the Main Document or Glossary Document part of relationship type http://schemas.openxmlformats.org/wordprocessingml/2006/styles
and has a content type of vnd-openxmlformats.officedocument.wordprocessingml-styles+xml
.
The styles part stores two types of style information for the document:
Style definitions
Latent style information