Editing Template:Citation Style documentation/registration (section)

=====Access indicator for named identifiers=====
<!-- ====Access level of identifiers==== -->
{{Shortcut|WP:DOIACCESS}}
<!--
Links inserted by identifiers such as {{para|doi}} are not expected to offer a free full text by default. If they do, editors can use {{para|doi-access|free}} (in the case of {{para|doi}}) to indicate the relevant access level.

Some identifiers always link to free full texts. In this case, the access level is automatically indicated by the template. This is the case for {{para|arxiv}}, {{para|biorxiv}}, {{para|citeseerx}}, {{para|pmc}}, {{para|rfc}} and {{para|ssrn}}.

{| class="wikitable plainrowheaders"
|+identifier parameter access icons
!scope="col"| url parameter
!scope="col"| access icon parameter
!scope="col"| supported keywords
|-
!scope="row"| {{para|bibcode}}
| {{para|bibcode-access}} ||rowspan="6"|<code>free</code> – [[File:Lock-green.svg|9px|link=|alt=Freely accessible|Freely accessible]] – the source is free to read for anyone (not supported by {{para|url-access}})
|-
!scope="row"| {{para|doi}}
| {{para|doi-access}}
|-
!scope="row"| {{para|hdl}}
| {{para|hdl-access}}
|-
!scope="row"| {{para|jstor}}
| {{para|jstor-access}}
|-
!scope="row"| {{para|ol}}
| {{para|ol-access}}
|-
!scope="row"| {{para|osti}}
| {{para|osti-access}}
|}
-->
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.

To be clear, these should be flagged when the databases themselves host the free document, not merely a link to another database that hosts them. For example, the following citation has 3 identifiers a [[Digital Object Identifier|DOI]], a [[PubMed Central Identifier|PMCID]], and a [[PubMed Identifier|PMID]].

* {{cite journal |last1=Velmovitsky |first1=Pedro Elkind |last2=Kirolos |first2=Merna |last3=Alencar |first3=Paulo |last4=Leatherdale |first4=Scott |last5=Cowan |first5=Donald |last6=Morita |first6=Plinio Pelegrini |title=Leveraging mHealth Technologies for Public Health |journal=JMIR Public Health and Surveillance |date=2024 |volume=10 |article-number=e49719 |doi=10.2196/49719 |doi-access=free |pmid=39265164 |pmc=11427850 }}

Clicking on the DOI takes you to a page where the full paper is freely accessible, so flagging with {{para|doi-access|free}} is appropriated. The PMCID link also takes you to a page where the full paper is freely accessible, and is likewise automatically flagged as free, as [[Template:Citation Style documentation#csdoc Embargo|virtually all]] PMCID links are free. The PMID link, however, only takes you to a page that contains links to free versions of the paper (the DOI link and the PMCID link), but does not host a free version itself. Therefore it is not flagged as free.

{| class="wikitable plainrowheaders"
|+ Named-identifier and access-indicator parameters
|-
!scope="col"| Identifier
!scope="col"| Access
!scope="col"| Allowed keywords
|-
!scope="row"| {{para|bibcode}}
| {{para|bibcode-access}} || rowspan="8" | <code>free</code> [[File:Lock-green.svg|9px|link=|alt=Freely accessible|Freely accessible]]
|-
!scope="row"| {{para|doi}}
| {{para|doi-access}}
|-
!scope="row"| {{para|hdl}}
| {{para|hdl-access}}
|-
!scope="row"| {{para|jstor}}
| {{para|jstor-access}}
|-
!scope="row"| {{para|ol}}
| {{para|ol-access}}
|-
!scope="row"| {{para|osti}}
| {{para|osti-access}}
|-
!scope="row"| {{para|ssrn}}
| {{para|ssrn-access}}
|-
!scope="row"| {{para|s2cid}}
| {{para|s2cid-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|medrxiv}}
*{{para|pmc}}
*{{para|rfc}}

For an embargoed {{#invoke:cs1 documentation support|canonical_name_get|PMC}} that will become available in the future, see [[Template:Citation Style documentation#csdoc Embargo|{{#invoke:cs1 documentation support|canonical_name_get|Embargo}}]].

When the sources linked by these named-identifier parameters are not presumed to carry a free-to-read full text (for instance because they're just abstracting services, host paywalled reviews, or give only basic information about the source), they may not be marked as <code>limited</code>, <code>registration</code>, or <code>subscription</code>. Those named identifiers are
*{{para|asin}}/{{para|asin-tld}}
*{{para|issn}}/{{para|e-issn}}
*{{para|isbn}}
*{{para|ismn}}
*{{para|jfm}}
*{{para|lccn}}
*{{para|mr|}}
*{{para|oclc}}
*{{para|pmid}}
*{{para|sbn}}
*{{para|zbl}}