Since eZ publish 3.9 extended attribute filters can also be used in the content/tree_count and content/list_count fetch functions.
There are many example uses of possible uses of extended attribute filters.
You will find more of them in this list on projects.ez.no.
If eZ Publish doesn't seem to want to load your extended attribute filter, then you might want to check out some useful tips to get it to work at the Troubleshooting extensions page.
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