Limitations

Patterns are not matched. The library returns the patterns as written, without their escape characters: it does not tell which entry owns a path. Match the patterns with your own code, and apply the last-match-wins rule. See Find the owners of a path.
Owners are not checked against the host. The parser checks the syntax of an owner, not that the user, the team or the email address exists, or that it has access to the repository.
One error per parse. Parsing stops at the first error. See Handling errors.
The file is read, not edited. The parsed values are read-only, and comments and blank lines are not kept. Use ToString to write entries and section headers back. See Write entries back.
Sections with the same name are not merged. Each section header gives its own CodeOwnersSection. See Sections with the same name.
The dialect is not detected. Pass the dialect of the host that reads the file. See Choose the dialect.