How does taxonomy="true" actually work?

I have a lot of entries, all tagged (with a relationship>taxonomy field).

In one template, I have this code:

<ul>
{{ taxonomy:listing folder="products" type="tags" }}
<li> {{ url }} - {{ title }}</li>
{{ /taxonomy:listing }}
</ul>

This shows a list of used tags. However, this:

{{ entries:listing folder="products" sort_by="title" taxonomy="true" }}
{{ title }}
{{ /entries:listing }}

shows nothing.

>>>>>>> Unanswered <<<<<<<
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