This template handles categorization of the current page when no url has been provided for the source citation.
Usage
No parameters; behavior is based entirely on the name of the current page. The category, if deployed, is Category:Articles with broken source templates.
Internals
Because this is only called when fields url and nocat are both blank, it's vastly less heavily transcluded than the parent template, so changes here are relatively inexpensive. At this writing, categorization is done in all namespaces except Template (thus omitting preload templates) and User (thus omitting mothballed unpublished articles).
See also