VisualEditor
, the visual interface to edit wiki pages, includes a tool to easily edit templates. However, in order for that tool to be most useful, it needs to be able to pull information about the template; mostly, it needs a list of possible parameters for the template, and their characteristics.
Without TemplateData, each parameter needs to be added manually when inserting a new template.
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No information is provided about what the value of the parameter should be.
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With TemplateData, a list of supported parameters (and their description) is provided for the template.
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TemplateData provides context for each parameter, and makes it much easier for users to modify templates.
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One of the things we need volunteers to do is the adding of TemplateData to templates (particularly high-profile ones, such as infoboxes) so that they are easy to edit.
The
TemplateData help page
explains how to add TemplateData information to a template.
You can probably think of some pretty important templates on your wiki very easily; experienced users know pretty well which templates are a big deal, and will inevitably find out when they try to use them and discover there isn't any TemplateData.
You can find an automatically-generated list of most used templates on your wiki on the
Special:MostUsedTemplates
special page.