I have a clothing site where multiple taxonomy vocabularies are used for content. For example, there are "Boys" and "Girls" terms, and clothing size terms such as "2" "4" "6" etc., as well as "Seasons" and "Sport" vocabularies.
A user only wants to be alerted when "Boys" "4" "Basketball" new content is posted.
I am aware that modules such as Notifications, Subscriptions, Simplenews, etc. exist -- but these only allow for new content notifications based on a single taxonomy term.
Could this be done with Rules (e.g. content type that contains each users' subscribed terms)? Or some other way, perhaps using Flag?