Markup spec/BNF/Article title

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The definitions on this page use some elements defined in Markup spec/BNF/Fundamental elements.

Canonical article title[edit]

The canonical article title is the version stored in the database. It has stricter rules about what it can contain than <article-title>, which can be used in page markup and other situations but must be converted to a canonical title for most other uses.

<canonical-article-title>	::= <canonical-page> [<canonical-sub-pages>]

<canonical-sub-pages>		::= <canonical-sub-page> [<canonical-sub-pages>]
<canonical-sub-page>		::= <sub-page-separator> <canonical-page-chars>
<canonical-page>		::= <canonical-page-first-char> [<canonical-page-chars>]
<canonical-page-chars>		::= <canonical-page-char> [<canonical-page-chars>]
<canonical-page-first-char>	::= <ucase-letter> | <digit> | <underscore> | ...?
<canonical-page-char>		::= <letter> | <digit> | <underscore> | ...?

<sub-page-separator>		::= "/"
There is not a native concept of subpages in MediaWiki. That's a cute add-on extra, and no such things is enforced in titles. --Brion VIBBER 04:05, 29 May 2006 (UTC)
The reason I have added them is so that when it comes to translating between forms we will need to be able to refer to the sub-page element (e.g. when generating the links list at the top of the page in HTML, or when converting a relative wiki-link to a canonical page title). --HappyDog 13:49, 29 May 2006 (UTC)

Article title[edit]

This is the description of an article title, as used in links and other similar situations. It must be converted to a <canonical-article-title> for most other uses though. The structure is basically the same as <canonical-article-title>, except for the final page-char terminals.

<article-title>		::= <page> [<sub-pages>]

<sub-pages>		::= <sub-page> [<sub-pages>]
<sub-page>		::= <sub-page-separator> <page-chars>
<page>			::= <page-first-char> [<page-chars>]
<page-chars>		::= <page-char> [<page-chars>]
<page-first-char>		::= <canonical-page-first-char> | <lcase-letter> | ...?
<page-char>		::= <canonical-page-char> | <space> | ...?


Transform <article-title> to <canonical-article-title>[edit]

<canonical-page-first-char>	=	ucase(<page-first-char>)
<underscore>	=>	" "