The input is the small graph displayed to the left. The result of the query will be the sum of all node labels of this graph. To calculate this, a
GetGraphElements_Box(Nodes) is used to filter all nodes from the input graph elements. The output of this box is shown as a pile of nodes. Those nodes are the input of the next box, a
GetAttributeValue_Box(label) that retrieves the label from those nodes. The result is a list of six numbers. Pushing this list into the
Arithmetic_Box(sum) yields the desired result as output.
This is a very simple and straightforward way of calculating the node label sum since it exactly follows the intuitive way of getting this result.