[wp-hackers] Custom Taxonomy WP_Query for All Terms in a Taxonomy

[David Morris]

Is there an easy way to query for any posts that is tagged with any term
from a particular taxonomy?

I know this technique:

$custom_taxonomy_query = new WP_Query(
array(
 'taxonomy_name' => 'term_slug',
 )
);

But I would like to either pass a wildcard in place of term_slug, or perhaps
just an empty string. Then that would give me all posts that are tagged by
any term in that taxonomy, not just one specific term.

Thanks for your help,
Dave