Vorlage:Subst check top/Doku
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Usage
Place these templates onto the main template in the following manner.
{{{{{|safesubst:}}}substchecktop|[template pagename]|subst={{{subst|}}}}}
...template code...
{{{{{|safesubst:}}}substcheckbottom|subst={{{subst|}}}}}
These templates will the main template for substitution and give an error message if it has been accidentally transcluded. {{substchecktop}} is placed above the template code and {{substcheckbottom}} is placed below the template code.
{{substchecktop}} takes in an input for the main template name as a parameter This is shown above as [template pagename]. This parameter should be entered so that the default error message refer to the correct main template. This default error message can be optionally replaced by a custom error message by using the message parameter. This parameter accepts templates and it is recommended that a message template be used for long messages to keep the parameter value short. These parameters are not used in {{substcheckbottom}}.
Both these templates use subst={{{subst|}}} as one of the parameters. This allows optional transclusion for demonstration purposes by setting the subst parameter on the main template to any value.