Directory Settings XML - Not Super Search

I have seen a couple of threads about configuring super search, but I can't find a way to auto-provision the directory settings - listed above the search settings in the Web interface of the phones (see attached image). Through some experimenting, I know that this is set by the directory_setting.url variable, but I cannot find documentation for the format of this xml file. It appears that this file uses a similar format to the super_search.xml file but the id_name must be different. Does anyone have an example of how this file is formatted?

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