Category:Pages using URL template with unknown parameters Source: en.wikipedia.org/wiki/Category:Pages_using_URL_template_with_unknown_parameters

Administrators: Please do not delete this category as empty! This category may be empty occasionally or even most of the time.

This is a maintenance category, used for maintenance of the Wikipedia project. It is not part of the encyclopedia and contains non-article pages, or groups articles by status rather than subject. Do not include this category in content categories. This is a tracking category. It builds and maintains a list of pages primarily for the sake of the list itself. They are not part of the encyclopedia's categorization scheme. This category is hidden on its member pages—unless the corresponding user preference (Appearance → Show hidden categories) is set. These categories can be used to track, build and organize lists of pages needing "attention en masse" (for example, pages using deprecated syntax), or that may need to be edited at someone's earliest convenience. These categories also serve to aggregate members of several lists or sub-categories into a larger, more efficient list (discriminated by classifications).

This category contains pages transcluding Template:URL (talk) with unknown parameters (undefined, misspelled, etc.).

Pages are typically sorted alphabetically by the unknown parameter that is used, e.g. pages using unknown parameter |foo= will be sorted under "F". The name of the page is typically used as a secondary sort key. See additional information from the Parameter usage report for Template:URL.

The most common error in {{URL}} templates is the existence of an equals sign in the URL. To fix this problem, add |1= before the URL, like this:

{{URL|http://www.example.com/example.aspx?ID=42}} → {{URL|1=http://www.example.com/example.aspx?ID=42}}

Articles in this category may be using {{URL}} or one of its redirects instead of {{cite web}} or similar templates.