Yield all nodes that the given node dominates or spans.

def get_child_nodes(docgraph, parent_node_id, data=False):
    """Yield all nodes that the given node dominates or spans."""
    return select_neighbors_by_edge_attribute(
        docgraph=docgraph,
        source=parent_node_id,
        attribute='edge_type',
        value=[EdgeTypes.dominance_relation],
        data=data)