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Substitution is a function whereby, when an editor saves a page, an item in the wikicode is permanently replaced with its current value. In particular, a template can be substituted, as an alternative to transclusion. The difference is that when a template is substituted on a page, its appearance on that page will no longer be affected by later changes made to the template itself. Substitution is done using the subst: modifier after the double opening braces. For example, to substitute the template , type Variables and parser functions can also be substituted, meaning that their current value will be recorded permanently on the page – they will not be re-evaluated whenever someone views the page. ==When to use substitution== Generally speaking, templates are transcluded rather than substituted, although there are some that are specifically designed to be substituted (and may not work if transcluded). Some reasons for substituting templates include: *making the resulting page independent of future changes to the template *enabling other automatic replacements to occur (for example, a template may contain four tildes, which will be replaced by the user's signature and timestamp provided the template is substituted) *enabling the page to be copied to another project without copying the template *making page rendering faster for the server *making the correspondence between wikitext and rendered page easier to understand (the opposite may also apply) Disadvantages of substitution may include: *Updates to the template will not be reflected on the target page *The resulting wikitext is longer and more complicated *Other users cannot see that the text was produced using a template (and will not learn to use the template) Time-dependent variables are substituted to make the rendered page independent of the time at which it is viewed. Substituting page-dependent variables makes the resulting wikitext independent of renaming of the page and of copying to another page. For more detailed guidance, including lists of templates which should or should not be substituted, see Wikipedia:Substitution. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Help:Substitution」の詳細全文を読む スポンサード リンク
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