One taxonomy for several post types

[typeomedia]

At the moment it is not possible to use e.g. the category taxonomy in more than one post type. The structure itself allows multiple usage of one taxonomy but you have to add the meta boxes and admin menu entries manually.

Example (plugin):

register_taxonomy( 'category', 'news', 
array('hierarchical' => true,
'update_count_callback' => '_update_post_term_count',
'label' => __('Categories'),
'query_var' => false,
'rewrite' => false));

Now the 'category' meta box and the 'category' menu entry in the post section vanishes but appears on the 'news' edit screen.
Any ideas how to solve this?

It works with 'register_taxonomy_for_object_type' instead 'of register_taxonomy'.

Would be good for 3.0 seeing there are huge improvements being made to both custom post types and taxonomies.

See #11838 for adding of the taxonomy menu's for hierarchial taxonomies.

As already mentioned, use register_taxonomy_for_object_type() to assign a current tax to another object type.