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<templatedata>JSON</templatedata> ./. {{TemplateBox}}

TemplateData

TemplateData is a way to store information about template parameters (the description of those and of the whole template) for both, humans and machines. It is used by VisualEditor and possibly other tools like Upload Wizard. At Wikimedia Commons, there is the recommendation to either use {{TemplateBox}} with useTemplateData=1 or useTemplateData=only on the /doc subpage and transcluding it with {{Documentation}} into the template. <nowiki>-tags can be wrapped around the the arguments, if required, to avoid templates being expanded. Another option, especially for imported templates, or for users with JSON experience, is placing raw <templatedata>-tags into the Wikitext or the template.

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There is an ongoing discussion about that matter. Feel invited to comment if you are experienced in either way, your time permits and if you like to share your opinion or to make a suggestion.

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Wikipedia's help about TemplateData • Commons-specific information