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Depending on the namespace and the settings, a forward slash in the pagename provides special functionality, see subpage feature .

Namespace prefixes [ edit ]

Also, the first part of a page name may not coincide with a project-independent namespace prefix that is automatically converted to another one . As an example, the name Project: A-Kon on Wikipedia is not possible.

The first part of a page name can coincide with a namespace prefix that is not converted. For example, there might be articles in the English Wikipedia about books called Wikipedia: The Big Adventure and Talk: Secrets are Bad (but only without the space after the colon). However, in that case the pages are in the wrong namespace. This may be inconvenient in searching or displaying a list of pages. Also, in the second case there is no link to a Talk page about the book. (As explained above, the second page name is not possible on e.g. the German Wikipedia: see w:de:Talk: Secrets are Bad).

Prefixes referring to other projects or pseudo-namespaces [ edit ]

A page name cannot start with a prefix that is in use to refer to another project, including language codes, e.g. "en:" (list), or one of the pseudo-namespaces "Media:" and "Special:".

Thus e.g. an article about the album "Q: Are We Not Men? A: We Are Devo!" can not have that exact name. An attempt to create the article, whether by a link Q: Are We Not Men? A: We Are Devo! or a URL http://en.wikipedia.org/wiki/Q:Are_We_Not_Men%3F_A:_We_Are_Devo%21 leads to Wikiquote.

With regard to using the prefix of the project itself there is no consistency: a name like en:a cannot be used on en: (try w:en:a and w:en:en:a), while "Q: Are We Not Men? A: We Are Devo!" can exist on Wikiquote: q:Q: Are We Not Men? A: We Are Devo! .

Maximum page name length [ edit ]

The maximum page name length is 255 bytes (excluding the namespace prefix). Be aware that non-ASCII characters may take up to four bytes in UTF-8 encoding, so the total number of characters you can fit into a title may be less than 255 depending on the language it"s in.

Spaces vs. underscores [ edit ]

In page names , a blank space is equivalent with an underscore. A blank space is displayed in the large font title at the top of the page, the URLs show an underscore. See also below.

Case-sensitivity [ edit ]

Currently the first character of the page name is case-in sensitive, except in the following Wiktionaries:

Case where the first character is case-insensitive

The canonical form is with a capital.

Note that in the case of a prefix that is not a namespace for the software, and in the case of a second prefix, the case-insensitivity does not apply to the first character after this prefix, e.g. Template:H:Interwiki linking and Template:H:interwiki linking are distinguished.

Case-sensitivity of the file name extension of an image [ edit ]

Note that even the file name extension of an image is case-sensitive: compare image:Stop_sign_us.jpg and image:Stop_sign_us.JPG 748410449856

Ignored spaces/underscores [ edit ]

Spaces/underscores which are ignored:

• those at the start and end of a full page name
• those at the end of a namespace prefix, before the colon
• those after the colon of the namespace prefix
• duplicate consecutive spaces

Some show up in the link label, e.g. [[___help__ :_ _template_ _]] becomes ___help__ :_ _template_ _ , linking to Help:Template .

However, a space before or after a "normal" colon makes a difference, e.g. and MediaWiki User"s Guide: Editing overview , and MediaWiki User"s Guide:Editing overview are all distinguished, because "MediaWiki User"s Guide:" is a pseudo-namespace, not a real one.

Coding of characters [ edit ]

A page name can not contain e.g. %41, because that is automatically converted to the character A, for which %41 is the code. [[%41]] is rendered as . Similarly %C3%80 is automatically converted to the character À. [[%C3%80]] is rendered as . The URL of the page is http://meta.wikipedia.org/wiki/%C3%80 . One can argue what is the real name of the page, %C3%80 or À (a user will say the latter), but anyway there can not be distinct pages with these names.

Canonical form [ edit ]

The inclusion tag for a non-existing page shows a link with the canonical form of the page name: {{qwsazx}}, {{:qwsazx}}, {{project:qws azx}} give Template:Qwsazx , Qwsazx , Wikiquote:Qws azx ; compare with ordinary links Template:qwsazx , qwsazx , project:qws azx ; these work like Piped links , e.g. []; in this case the conversion shows up on the referring page only when pointing at it: in the pop-up and in the status bar (if applicable for the browser); whether the target is a redirect, and what the final target is, is not shown at all.

An attempt to include a page from another project results in just displaying the wikitext, e.g. Template:Qwsazx ; ordinary interwiki links do not show existence and do not show a canonical form in the hover box or status bar: en:project:qwsazx . The same applies if interwiki link style is used for a link to a page in the same project: m:project:qwsazx .

A saved redirect page shows the canonical form of the target, even though the preview renders the link in the usual way, compare with the preview of .

Alphabetical order [ edit ]

Thus we have the following partial list showing the order:

!"#$%&"()*+,-./0123456789:;<=>?@
ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_"
abcdefghijklmnopqrstuvwxyz{|}~
¡¢£¤¥¦§¨©ª«­®¯°±²³´µ ¸¹º»¼½¾¿
ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖ×ØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþÿ
ĀāĂ㥹ĆćĈĉĊċČčĎďĐđĒēĔĕĖėĘęĚěĜĝĞğĠġĢģĤĥĦħĨĩĪīĬĭĮįİıIJijĴĵĶķĸĹĺĻļĽľĿŀŁłŃńŅņŇňʼnŊŋ
ŌōŎŏŐőŒœŔŕŖŗŘřŚśŜŝŞşŠšŢţŤťŦŧŨũŪūŬŭŮůŰűŲųŴŵŶŷŸŹźŻżŽžſ
ǺǻǼǽǾǿ΄΅Ά·ΈΉΊΌΎΏΐ
ΑΒΓΔΕΖΗΘΙΚΛΜΝΞΟΠΡΣΤΥΦΧΨΩΪΫάέήίΰ
αβγδεζηθικλμνξοπρςστυφχψωϊϋόύώ

Note in particular that "Z" comes before "a", and "z" before "é". The blank space within a page name is treated as an underscore, and therefore comes after the capitals, and before the lower case letters. However, a "blank space" after the name comes before any character. Sometimes a special character looks like a regular letter, but has a special code anyway.

Thus we have the order PC, PCX, PC Bruno, PCjr, Κύρια Σελίδα.

Variables PAGENAME and PAGENAMEE [ edit ]

Within localurl, {{PAGENAME}} should be used in the first part (because it is converted by localurl), or {{PAGENAMEE}} in the second part:

• {{SERVER}}{{localurl:Special:Allpages|namespace=12&from={{PAGENAMEE}}}} gives here:

//сайт/w/index.php?title=Special:Allpages&namespace=12&from=Page_name

• {{SERVER}}{{localurl:Special:Allpages/{{PAGENAME}}|namespace=12}} gives here:

//сайт/w/index.php?title=Special:Allpages/Page_name&namespace=12

• {{SERVER}}{{localurl:Special:Allpages|namespace=12&from={{PAGENAME}}}} gives here:

//сайт/w/index.php?title=Special:Allpages&namespace=12&from=Page name (wrong link)

• {{SERVER}}{{localurl:Special:Allpages/{{PAGENAMEE}}|namespace=12}} gives here:

//en.wikiquote.org/w/index.php?title=Special:Allpages/Page_name&namespace=12 (works here, the underscore, converted from a space, is not affected by the second conversion, but it does not work with special characters).