I've seen examples in a few places (including this one: User Migration - ZimbraWiki ) of how to retrieve a list of all contacts that have been tagged with a certain tag.

The published format is:
But when I try this:
I get a CSV file with the field header row, but no content. And several contacts are tagged with the 'bureau' tag.

If I leave off the query part of the URL, it returns all contacts as it should.

Why isn't the query working?

As an alternative, does anyone have an example of a SOAP call that returns all the fields for all contacts that match a tag?