| cot_tag_cloud | Collects data for a tag cloud in some area. |
| cot_tag_complete | Gets an array of autocomplete options for a given tag |
| cot_tag_count | Returns number of items tagged with a specific keyword |
| cot_tag_exists | Checks whether the tag has already been registered in the dictionary |
| cot_tag_isset | Checks whether a tag has been already set on a specific item |
| cot_tag_list | Returns an array containing tags which have been set on an item / items |
| cot_tag_parse | Parses user input into array of valid and safe tags |
| cot_tag_parse_query | Parses search string into SQL query |
| cot_tag_prep | Convert the tag to lowercase and prepare it for SQL operations. |
| cot_tag_register | Attempts to register a tag in the dictionary. |
| cot_tag_remove | Removes tag reference from a specific item |
| cot_tag_remove_all | Removes all tags attached to an item, or all tags from area if item is set to 0.
|
| cot_tag_search_form | Global tag cloud and search form |
| cot_tag_title | Converts a lowercase tag into title-case string (capitalizes first latters of the words) |
| cot_tag_unregister | Unregisters a tag from the dictionary |