Re: [w3c/permissions] Allow UAs to maintain zero or multiple permission stores. (#95)

>    </p>
>    <ol>
> -    <li>If the <a>user agent</a> has a {{PermissionStorage}} associated
> -    with the <a>permission storage identifier</a> in its permission store,
> -    it MUST return the {{PermissionStorage}}.
> +    <li>Let <var>settings</var> be the <a>current settings object</a>.</li>
> +    <li>
> +      Let <var>store</var> be some <a>permission store</a> associated with the
> +      <a>same origin</a> as <var>settings</var>. This store SHOULD be chosen
> +      consistently for a given <a>environment settings object</a>.

This wouldn't necessitate a per-realm store, just that every real has a single store that is authoritative for that realm.

Or is that really the case?  Or is it that there is a hierarchy of stores for a given realm and that looking for a permission requires checking each in turn?  If the realm has a store created by storing permissions for permission "A" and it queries for permission "B", which is not yet stored in the realm.  It could have a permission for "B" stored in a per-origin store, though.  This all suggests that you either have a chain of stores to check, or that you have a store for a realm that might be initially populated with information from other stores.

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