Meeseeks.Document.parent

You're seeing just the function parent, go back to Meeseeks.Document module for more information.
Link to this function

parent(document, node_id)

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Specs

parent(t(), node_id()) :: node_id() | nil | no_return()

Returns the node id of node_id's parent in the context of the document, or nil if node_id does not have a parent.

Raises if node_id does not exist in the document.