tags matched by a glob)
* "`backlink(page)`" - matches only pages that a given page links to
* "`creation_month(month)`" - matches only files created on the given month
+ number
* "`creation_day(mday)`" - or day of the month
* "`creation_year(year)`" - or year
* "`created_after(page)`" - matches only files created after the given page