How to write a heading?

[T_H_Lawrence]

As I understand, there are two types of words - content and structure. While prepositions, conjunctions and articles are structure words, the others are content words. That being so, content words are written beginning with a capital letter and others are left in small letters. If the heading starts with a structure word it will also begin with a capital. For example:

(i) "The Unwritten Constitution of the Utopian Republic'.
(ii) "Judicial Delay May Become a Thing of the Past".

Please offer your comments.
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Anglophile