Currently, Posts have "tags" and in the post edit page you can add and remove tags using the widget.

I would like to add another such tag-system (say, keywords) and I would like for it to use the tag interface to add and remove tags.

Suggestion on how I should go about this ?

  • In addition to or in replace of the native support for tags? – Brad Dalton Jan 6 '14 at 12:46

You'll need to use register_taxonomy with hierarchical set to false:

function add_custom_taxonomies() {
// Add new "Locations" taxonomy to Posts
register_taxonomy('keyword', 'post', array (
        'hierarchical' = false
add_action( 'init', 'add_custom_taxonomies', 0 );

For more information: - Wordpress API - Tutorial @ Smashing magazine

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