Use an XPath query to set a start page. For a context-aware query, you can use one of the pre-defined placeholders.

Placeholders find the nearest published content ID and run the XPath query from there. For instance:

    $site/newsListingPage

This query will try to get the current website page (at level 1), then find the first page of type `newsListingPage`.

Available placeholders:
  `$current` - current page or closest ancestor.
  `$parent` - parent page or closest ancestor.
  `$root` - root page in the content tree.
  `$site` - ancestor page located at level 1.

Please note, when using an XPath query, this data source will not work if used within a 'Nested Content' element type. This is a known issue. Please see GitHub issue #30 for details.