Some names and work titles intentionally use distinctive casing or punctuation that a generic title-case algorithm should not normalize away. A safe converter needs a reviewed preservation layer and must distinguish a known protected form from arbitrary mixed case.
ReviewedEvidence5 sourcesSectionWriting & Style
Quick answer
Preserve a reviewed canonical brand or work-title span when the source establishes that form. Unknown mixed-case names and embedded work titles should still leave the result unresolved rather than being forced into ordinary title case.
Key details
Automation Statusleave the result unresolved for unknown special casing
Protectionreviewed exact spans only
Rule Familycase-preservation
Further guidance
Converter Policy
Known protected names and titles can preserve their reviewed casing. Unknown mixed-case spans should not be recased automatically.
Distinctive Titles
Chicago allows limited exceptions when a work’s deliberately distinctive title capitalization is clearly established, including the lowercase novel title “them.”
Known Title Forms
Chicago also documents cases where a work title’s accepted public form does not match the punctuation or capitalization an automatic Chicago transformation might otherwise impose.
Sources and evidence
Sources are shown with the role they play in this guide. Historical or style-sensitive claims are kept within the evidence boundary described above.
A title appearing inside another title has its own identity and may need quotation marks, italics, or language-specific treatment. Flattening the inner title into the outer title’s token stream can destroy both formatting and capitalization.
Quotation marks do not by themselves decide which words are capitalized. A converter must distinguish harmless outer quotation punctuation from an embedded title or quoted structure that may need its own capitalization and formatting rules.
An ampersand is meaningful text, not merely decorative punctuation. Chicago normally limits ampersands in edited prose but preserves them in established terms, corporate names, verbatim quotations, and work titles that use the symbol.
Apostrophes can mark possession, contractions, or omitted initial letters, and those uses should not be confused with quotation marks. Chicago also has specific title-case examples for initial-apostrophe contractions and for the compound form “O’Clock.”
Hyphens and dashes are not interchangeable in title-case logic. Chicago 18 changed the treatment of later elements in prefix-based hyphenated compounds, while an em dash can act like a parenthetical or subtitle-like boundary depending on structure.
A colon can create a title/subtitle boundary, but nested punctuation still needs structural handling. Chicago capitalizes the first word after a title/subtitle colon; repeated or nested colons should therefore be parsed as boundaries rather than treated as ordinary word punctuation.
The first word of a subtitle is treated as a new capitalization boundary in major title-case systems. APA explicitly capitalizes the first word of a subtitle, Chicago capitalizes the word after a title/subtitle colon, and MLA has published the same treatment in its Style Center guidance.
