「ヘルプ:Categories/ja」を編集中

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MediaWiki ソフトウェアのカテゴリ機能は自動的なインデックス作成を提供するものであり、そのインデックスは目次として利用できます。

1 つ以上の '''Category''' {{#ifeq:Category|{{ns:category}}||'''({{ns:category}})'''}} タグを、ページやファイルの本文に追加することで、これらを分類できます。このタグをページに書き込むと、ページの最下部にカテゴリへのリンクができます。リンク先のページでは、そのカテゴリに属するすべてのページの一覧が表示されますので、関連する項目を探すのに便利です。

== 要約 ==

Each of the pages in the '''Category''' [[Help:Namespace|namespace]] represents a so-called '''category''', a grouping of related pages, and contains an index for the pages of its category. For example, this page belongs to "[[:Category:Help]]". If you open the "[[:Category:Help]]" page, you will see a link to this page there.

When a page belongs to one or more categories, these categories appear at the bottom of the page (or in the upper-right corner, depending on the [[Help:Preferences|skin]] being used).

カテゴリ ページ自身は 2 つの部分を含んでいます:

* at their beginning, an optional part may contain text that can be edited, like any other page,
* at their end, an ever present, automatically generated, alphabetical list of all pages in that category, in the form of links. (In fact, in ASCII order. See [[Help:Special page]]).

To assign a category to a page, simply add the link "<nowiki>[[</nowiki>Category:''Category name'']]" to the page's wikitext. The usual place to add it is at the bottom of the page.

To link a category page within a page as a normal wiki link (without adding the page to the category), prefix the link name with a colon.  For example: <nowiki>[[</nowiki>:Category:Not in this category]]

New categories can be [[Help:Starting a new page|created]] before assigning any page to it, in the same way as any other regular page.

Individual wikis may have their own top-level categories, such as [[wikipedia:Category:Contents|Category:Contents]] in Wikipedia.

For a complete list of all categories which have at least one page, see [[Special:Categories]].

For a complete list of all created/edited categories, including the ones that don't have any page, see [[Special:Allpages/Category:]] (note the colon at the end).

== ページをカテゴリに追加 ==

ページまたはアップロードしたファイルをカテゴリに追加する手順は、ページの編集画面で以下の内容を書くだけです ('''''名前''''' を追加したいカテゴリの名前に読み替えてください)。

 <nowiki>[[</nowiki>{{ns:category}}:'''''名前''''']]

Any number of {{ns:category}} tags may be added to the page and the page will be listed in all of them. {{ns:category}} tags, along with [[Manual:Interwiki#Interwiki_links_to_other_languages|interwiki language links]] placed in the sidebar, are usually added at the very bottom of the page for the convenience of other editors. 

On a categorized page, categories are displayed in the Categories: box strictly in the order they appear in the wikitext. 

If $wgUseCategoryBrowser is set to true, under the first list each category is listed again, [[wikipedia:breadcrumb (navigation)|breadcrumb]]-style, with all its parent categories, sorted alphabetically. (At least in MediaWiki 1.18.2) if a category is a subcategory of more than one parent, both hierarchies will be listed, but the tagged category will be stripped off all but one of these. This creates the potential for what appear to be duplicate entries if a category with multiple parents ''and'' one of its parents are both tagged on a page. For example suppose Maryanne is a subcategory of both Mary and Anne. If a page tags categories Maryanne and Anne then the Category breadcrumbs will show

 Anne 
 Anne
 Mary -> Maryanne

"Anne" appears to be duplicated, but what is meant is

 Anne 
 Anne -> Maryanne
 Mary -> Maryanne

This is probably a bug, and has been reported in [https://bugzilla.wikimedia.org/show_bug.cgi?id=33614 Bug 33614].

=== ソートキー ===

By default, a page is sorted within a category under the first letter of its name — ''without the namespace''. Also, MediaWiki groups accented characters separately from their unaccented version, so pages starting by À, Á, Ä, will be listed under separate headings, instead of under heading A. (If you have shell access, these defaults can be changed using [[Manual:$wgCategoryCollation|$wgCategoryCollation]].)

A ''sort key'' specifies under which letter heading, and where in the category list, the page will appear. You can add a sort key by placing it inside the tag after a pipe character. For example, the tag below will add the page under heading "S".

 <nowiki>[[</nowiki>{{ns:category}}:'''''名前'''''|'''''ソートキー''''']]

ソートキーでは大文字小文字が区別され、また空白類やその他の文字もソートキーとして認識されます。カテゴリ内の節の並び順は Unicode のコードの順になります。ソートキーを変更しても、カテゴリ内で表示されるページ名は変化しません。

See [[Help:Sorting]] for further information on category sorting.

== カテゴリページの作成 ==

Categories exist even if their page has not been created, but these categories are isolated from others and serve little purpose for organization or navigation.

カテゴリは他のページと同じ方法で '''''Category:''''' 名前空間に作成できます（[[Help:Starting a new page/ja]]参照）。ただ、カテゴリ名の前に <code>{{ns:category}}:</code> を追加するだけです。

無駄な手間を生じさせないためにも、カテゴリを新規作成する前にウィキ内にあるカテゴリをよく調査した方がよいでしょう。[[Help:Navigation#Sidebar|サイドバー]]の「{{lcfirst:{{int:toolbox}}}}」にある「{{lcfirst:{{int:specialpages}}}}」のリンクからウィキ内の全カテゴリの一覧にアクセスできます。

他のページと異なり、カテゴリの改名（移動）はできません。改名が必要な場合、新しくカテゴリを作り直し、カテゴリに入れるページのカテゴリタグをすべて貼り替えなければなりません。この方法はカテゴリの履歴を失うことになり、カテゴリページに説明用テキストが多く含まれる場合にはあまりよくありません。

==カテゴリの階層の保守==   

Categories may belong to other categories in a hierarchy. Since category pages are much like any other page, a {{ns:category}} tag may be added to the bottom of a category page. 

It is a good idea to organize all categories into a hierarchy with a single top level category. The category structure can take the form of a tree with separate branches, but more often will have a graph structure. Generally, there should be a contiguous chain of parent-child links between each category and the top level category. 

==隠しカテゴリ==

The categories that a page is in are normally listed at the bottom of the page. 
In Mediawiki 1.13+,
a category can be hidden from this list by adding the [[Help:Magic words|magic word]] "<code><nowiki>__HIDDENCAT__</nowiki></code>" to the category page. Hidden categories are not hidden from category pages ({{bugzilla|15550}}).

Users can choose to see hidden categories in a separate "{{int:hidden-categories}}" list, by checking "{{int:tog-showhiddencats}}" in the "{{int:prefs-rendering}}" section of [[Special:Preferences]].

Hidden categories are automatically added to [[:Category:{{mediawiki:hidden-category-category}}]]. This category is specified in the system message [[MediaWiki:Hidden-category-category]].

''関連項目:'' [[m:Help:Category/ja#隠しカテゴリ|隠しカテゴリ]]

== カテゴリページにリンクする ==

カテゴリページにリンクをするには、冒頭にコロン（<code>:</code>）を挿入します (このコロンがないと、そのページがカテゴリに追加されます):

:<code><nowiki>[[</nowiki>:{{ns:category}}:ヘルプ]]</code> &rarr; '''[[:{{ns:category}}:ヘルプ]]''' 

リンクラベルに別のテキストを表示したい場合は、パイプのあとにリンクラベルを書きます:

:<code><nowiki>[[</nowiki>:{{ns:category}}:Help|Help category]]</code> &rarr; '''[[:{{ns:category}}:Help|Help category]]'''
 
カテゴリへの[[Help:Redirects/ja|リダイレクト]]にも冒頭のコロンをつけないと、そのリダイレクトページがカテゴリに含まれてしまいます。

==カテゴリのリダイレクト==

Like normal wiki pages, category pages can be redirected to other normal or category pages. ''However'', this is not recommended, as pages categorized in redirected categories do ''not'' get categorized in the target category ([[:bugzilla:3311]]). Some Wikimedia sites use a "category redirect" template to mark redirected categories, allowing manual or automated cleanup of pages categorized there.

==カテゴリの追跡==

Certain syntax issues, such as a broken image link, or too many expensive parser functions, can cause a page to be added to a tracking category. See [[Help:Tracking categories]] for details.

==関連項目==

* [[Special:MyLanguage/Category:Category extensions|Category:Category extensions]]

[[Category:Help{{translation}}|Categories]]
[[Category:Category{{translation}}]]