[skip] Reset to zero state (1m)
[skip] Added the core part to the package (1m)
[skip] Made root_namespaces private (1m)
[skip] Added helper for asserting that an instance is a class (1m)
[skip] Added web settings part (15m)
[skip] Added rels part (10m)
[refactor] Extracted XML generation defaults to a method (3m)
[skip] Added the content_types part (15m)
[skip] Removed extraneous `@` (1m)
[skip] Added document part (10m)
[skip] Standardized spacing (1m)