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साँचा:dablink साँचा:subcat guideline

Template substitution or subclusion (substitution + transclusion) is the automatic one-time copying of a template's code/text to the location of a template tag, instead of the standard transclusion functionality implemented by a standard template tag (of the form {{template name}}). The subclusion tag is modified from the standard template tag simply by adding subst:, creating a tag with the form:

{{subst:template name}}.

This page lists templates that should always or should never be substituted except in the Wikipedia namespace. Automated tools (bots) that do such replacements will never be used on the original template pages.

If you are going to use a bot to substitute templates, please read through the talk page first, as many are under dispute or change status over time, and substitution is permanent.

About subst

Definition

The subst: keyword (short for "substitution") is used as a prefix inside template code. It changes the way the software expands the template. Ordinarily, a template will be expanded "on the fly"; that is, the template code on a page calls a separate page every time it is rendered. Although most page views are served from the cache, pages need to be rendered for previews, and rendered again when the page changes. When someone is editing a page with a normal template call, they see the template call. Placing "subst:" inside the curly brackets tells the software to permanently replace the template with the text of the template (i.e., the text that is on the template's article page when the template is added to the page). Therefore {{template}} becomes {{subst:template}}, until you save the page. The next editor sees not the template call, but the text of the template when you saved; it does not change even if the template is edited.

Usage

You can subst a template tag by adding "subst:" to a template tag. For example, use {{subst:test5}} instead of {{test5}}.

When this is a major component of an edit, it is strongly suggested that the template be mentioned in the edit summary (for instance, put "{{subst:test}}", "subst:test" or "test1 applied" in your edit summary) so other editors can easily see what you have done.

Additionally, when creating or editing templates that are commonly substituted, adding an HTML comment to the template page helps article editors to see how templates are being used (e.g. <!-- Substituted from Template:Documentation -->).

Benefits of substitution

  • Templates are often modified or deleted. If a template is boilerplate text, consider whether you want it to vary as the template is improved. If your answer is "no", substitution is warranted. An example of this is the साँचा:tl template. The archives of a user's talk page should show the actual welcome message they received, not the current welcome message.
  • If there is a template you would like to modify for a single occasion, but you do not want to modify the template for all the pages that use it, and you do not want to make a new template, you can substitute the template and then with a second edit, make the modifications. For example: a template might be used with all the states of the United States and with the District of Columbia. The template might be worded correctly for the states, but not for DC. To fix the wording, you can substitute the template and then fix the wording.
  • Substituting frequently used, but unprotected templates (of which there are few, such as साँचा:tl) limits the damage that can be caused by vandalising them. See high-risk templates.
  • Using certain templates hides wikitext from newcomers, which prevents them from learning how to use it. (Of course, there is a "how to edit" link at the bottom of each edit page.)
  • Substituting en masse may speed up the site, though the amount and significance of this is the subject of frequent debate. Every time a page is rendered, the server must get text from a separate page for each template used; while each individual template has little effect, the vast number of templates used on Wikipedia is one factor affecting server load and article load times. However, Chief Technical Officer Brion Vibber (who "maintain[s] overall responsibility for all technical functions of the Foundation, including both hardware and software") has said: "'Policy' should not really concern itself with server load except in the most extreme of cases; keeping things tuned to provide what the user base needs is our job." (See Wikipedia:Don't worry about performance.)

Drawbacks of substitution

  • Once a template is substituted, the result is no longer linked to the template, making it hard to find all pages displaying that text (though categories can sometimes relieve this). This problem can easily be worked around by including a link to the template in the template's code.
  • A substituted template will not be updated when the master template is updated.
  • If the template is used to standardize the appearance of something, you probably do not want to do a substitution. An example of this is a table of contents or navigation box.
  • Substituting en masse — editing thousands of articles with bots — slows down the site and wastes server resources unnecessarily.
  • Substitution increases the size of articles in the database and database dumps.
  • A substituted template can add a lot of wiki-code or HTML to the article, harming accessibility for the less technically inclined.
  • Substituting templates prevents newcomers from learning to use templates, and prevents users from finding their documentation.
    • When a user tries to copy, for example, the warnings for vandaloids created by the templates described at Template:Test, from an existing page to another page where it is needed, that user receives no clue that the content on the existing page was created by a template! If the template has changed recently, then the user might find several undated versions of each warning. The user is left wondering what to do. It looks like each editor copies or makes their own warnings. Which version to use? Write my own? This whole 'subst' feature is weird,
  • If the template is just being used temporarily, it is usually better not to substitute. Substituted templates are much harder to remove or modify.
  • When a vandalised template is substituted, it is more difficult to repair than regular vandalism because of the lack of links between the template and its incarnations and the lack of updatability.
  • Unsubstituted deletion tags for trivial pages (such as categories and redirects) offer the deleting administrator a convenient, meaningful deletion summary. Example:
    "content was: '{{rfd}} #REDIRECT Wikipedia' (and the only contributor was 'Jimbo Wales')".
    A precise deletion comment gives onlookers (especially non-administrators unable to view the deleted edits) better insight as to why a specific item may have been deleted. If templates such as साँचा:tl, साँचा:tl, etc. are substituted, the "reason for deletion" field defaults to a blank line. However, pages deleted via साँचा:tl and साँचा:tl should be deleted with a link to the subpage where the deletion was discussed.

Templates that should be substituted

This is a list of templates that should always be substituted, organized by namespace. Each list is ordered alphabetically with grouped series.

Article namespace

Article talk

User talk namespace

All of the templates listed in Category:User warning templates should be substituted.

Image namespace

(none listed)

Deletion-process documentation

Misc. templates

Uncategorised suggestions

Templates that must be substituted

These templates have a purpose and/or syntax that require them to be substituted.

Templates that should not be substituted

Technically, templates shall not be substituted that

(a) contain calls to ParserFunctions (#if, #switch, etc.), unless, where possible, these are substituted too (see m:Help:Substitution#Multilevel_substitution)
(b) template calls that do leave some parameters to their defaults by not specifying them, unless the alternative default mechanism is used
because those constructs are not replaced in the generated wiki-code (Single level substing of case (a) leaves the #if or #switch constructs verbatim at the subst location and (b) leaves constructs like "{{{1|default value}}}").
If specific consensus is to eliminate a particular call of such a template, Special:ExpandTemplates can be used to expand that call to plain wiki-syntax.
(c) templates that contain external links as the formatting of the URL to perform queries or look-ups may change.

List

This is a list of templates that should not be substituted. This is because they can either contain formatting standard code, contain complex code or contain code that breaks, if substituted.

Wrong title templates

These templatesसाँचा:mdash used in the main-spaceसाँचा:mdash add a comment about why an article is misnamed. The categories for these templates are being removed because they create a self-reference. Once the categories are removed, the "What links here" tool can be used to find all transclusions of the template. They should not be subst'd, because it will remove this method of finding where it is used.

Note that hidden categories can now be used for purposes such as this.

Chemical abbreviations

See Category:Chemical element symbol templates. These are used to simplify the entry of chemical formulae.

Deletion-related

Most templates related to renaming or deleting pages are used temporarily, and thus do not need to be substituted (it just makes more work to delete them).

Exceptions: The following templates must be substituted in order to work correctly:

In addition, those templates which document a finished deletion process (साँचा:tl, etc.) should be substituted.

Standardised appearance templates

These templates are intended to standardise the appearance of pages across a system of pages, and should not be substituted as doing so would make it prohibitively labour-intensive to edit them.

Under debate

See also

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