How to forbid addition of a Tag

Question

I want a questioner to choose only the Tag prepared in advance (like a category).

If there is a method of enabling it to choose only existing Tag in question form, please let me know.

Thank you for your consideration.

Answer 1

It's not currently possible, but it should be easy to do with a filter plugin in 1.5.

But a question: how are the initial tags set up if users can't ever define new ones?

Comments

Thank you, gideon.

> But a question: how are the initial tags set up if users can't ever define new ones?

Yes, It is also a problem. Since it cannot set up from a management screen like a category now, it adds to database directly or supplies example  question.

I would like to use category and tag as key and to take a Q2A record into an external system. Example... RSS or PHP function(get_posts() of WordPress).

http://codex.wordpress.org/Template_Tags/get_posts
Exp code:
$args = array('category_name'=>$cats, 'tag'=>$tags);
$posts = get_posts($args);