வார்ப்புரு:Citation Style documentation/registration
&lt;span id=&quot;csdoc_access_level&quot;&gt;&lt;/span&gt;{{tracked|T225430}}Citations of online sources that require registration or a subscription are acceptable in Wikipedia as documented in [[WP:PAYWALL|Verifiability – Access to sources]]. As a courtesy to readers and other editors, editors should signal the access restrictions of the external links included in a citation.  {{lang|la|Nota bene}}: access icons do not display correctly for editors who use Modern skin.
 
 Four access levels can be used:
 * [[File:Lock-green.svg|9px|link=|alt=Freely accessible|Freely accessible]] &lt;code&gt;free&lt;/code&gt;: the source is free to read for anyone (this applies in particular to articles in open access)
 * [[File:Lock-gray-alt-2.svg|9px|link=|alt=Free registration required|Free registration required]] &lt;code&gt;registration&lt;/code&gt;: a free registration is required to access the source
 * [[File:Lock-gray-alt-2.svg|9px|link=|alt=Free access subject to limited trial, subscription normally required|Free access subject to limited trial, subscription normally required]] &lt;code&gt;limited&lt;/code&gt;: there are other constraints (such as a cap on daily views) to freely access this source
 * [[File:Lock-red-alt-2.svg|9px|link=|alt=Paid subscription required|Paid subscription required]] &lt;code&gt;subscription&lt;/code&gt;: the source is only accessible via a paid subscription (&quot;[[paywall]]&quot;)
 
 As there are often multiple external links with different access levels in the same citation, these values are attributed to a particular external link.
 
 =====Access indicators for url-holding parameters=====
 Sources linked by {{para|url}}, {{para|chapter-url}}, {{para|entry-url}}, {{para|article-url}}, and {{para|section-url}} are presumed to be free-to-read. When they are not free-to-read, editors should mark those sources with the matching access-indicator parameter so that an appropriate icon is included in the rendered citation.  Because the sources linked by these url-holding parameters are presumed to be free-to-read, they may not be marked as &lt;code&gt;free&lt;/code&gt;.
 {| class=&quot;wikitable&quot;
 |+ url-holding and access-indicator parameters
 |-
 ! url !! access !! allowed keywords
 |-
 | {{para|url}} || {{para|url-access}} || rowspan=&quot;6&quot; | &lt;code&gt;registration&lt;/code&gt; [[File:Lock-gray-alt-2.svg|9px|link=|alt=Free registration required|Free registration required]]&lt;br /&gt;&lt;code&gt;limited&lt;/code&gt; [[File:Lock-gray-alt-2.svg|9px|link=|alt=Free access subject to limited trial, subscription normally required|Free access subject to limited trial, subscription normally required]]&lt;br /&gt;&lt;code&gt;subscription&lt;/code&gt; [[File:Lock-red-alt-2.svg|9px|link=|alt=Paid subscription required|Paid subscription required]]
 |-
 | {{para|article-url}} || {{para|article-url-access}}
 |-
 | {{para|chapter-url}} || {{para|chapter-url-access}}
 |-
 | {{para|contribution-url}} || {{para|chapter-url-access}}{{dagger}}
 |-
 | {{para|entry-url}} || {{para|entry-url-access}}
 |-
 | {{para|section-url}} || {{para|section-url-access}}
 |}
 {{dagger}}{{para|contribution-url-access}} not currently defined; use its alias {{para|chapter-url-access}}
 
 =====Access indicators for named identifiers=====
 Links inserted by named identifiers are presumed to lie behind a paywall or registration barrier – exceptions listed below. When they are free-to-read, editors should mark those sources with the matching access-indicator parameter so that an appropriate icon is included in the rendered citation.  Because the sources linked by these named-identifier parameters are not presumed to be free-to-read, they may not be marked as &lt;code&gt;limited&lt;/code&gt;, &lt;code&gt;registration&lt;/code&gt;, or &lt;code&gt;subscription&lt;/code&gt;.
 
 {| class=&quot;wikitable&quot;
 |+ named-identifier and access-indicator parameters
 |-
 ! identifier!! access !! allowed keywords
 |-
 | {{para|bibcode}} || {{para|bibcode-access}} || rowspan=&quot;6&quot; | &lt;code&gt;free&lt;/code&gt; [[File:Lock-green.svg|9px|link=|alt=Freely accessible|Freely accessible]]
 |-
 | {{para|doi}} || {{para|doi-access}}
 |-
 | {{para|hdl}} || {{para|hdl-access}}{{dagger}}
 |-
 | {{para|jstor}} || {{para|jstor-access}}
 |-
 | {{para|ol}} || {{para|ol-access}}
 |-
 | {{para|osti}} || {{para|osti-access}}
 |}
 
 Some named-identifiers are always free-to-read. For those named-identifiers there are no access-indicator parameters, the access level is automatically indicated by the template. These named identifiers are:
 *{{para|arxiv}}
 *{{para|biorxiv}}
 *{{para|citeseerx}}
 *{{para|pmc}}
 *{{para|rfc}}
 *{{para|ssrn}}
 
 =====Ambiguous access parameters=====
 The parameters {{para|registration|yes}} and {{para|subscription|yes}} can also be used to indicate the access level of a citation. However, they do not indicate which link they apply to, so editors are encouraged to use {{para|url-access|registration}} and {{para|url-access|subscription}} instead, when the restriction applies to {{para|url}}. If the restriction applies to an identifier, these parameters should be omitted.
 
 These parameters add a link note to the end of the citation:
 * '''{{xtd|registration}}''': (deprecated) &lt;s&gt;For online sources that require registration, set {{para|registration|yes}} (or &lt;code&gt;y&lt;/code&gt;, or &lt;code&gt;true&lt;/code&gt;); yields to '''{{xtd|subscription}}''' if both are set.&lt;/s&gt; Use the appropriate [[#Subscription_or_registration_required|access-indicator parameter]]
 * '''{{xtd|subscription}}''': (deprecated) &lt;s&gt;For online sources that require a subscription, set {{para|subscription|yes}} (or &lt;code&gt;y&lt;/code&gt;, or &lt;code&gt;true&lt;/code&gt;); supersedes '''{{xtd|registration}}''' if both are set.&lt;/s&gt; Use the appropriate [[#Subscription_or_registration_required|access-indicator parameter]]