{
"properties": {
"project_nodes": "tree_node_array",
"project_expanded": "tree_node_id_array",
"project_selected": "nullable_tree_node_id"
},
"actions": {
"project_selected_changed": "tree_node_id",
"project_expanded_changed": "tree_node_id_array",
"project_invoked": "tree_node_id"
}
}