Subgraphs

A subgraph is a fully functional graph loaded within another graph. This is done by loading of a previously saved graph asset, using a graph asset node.

The graph is thus represented as a node, with

• The graph's parameters as the node's input,
• The graph's computed primitives (all primitives of all output nodes) as the node's output.

This makes graphs a nestable, or recursive, concept.

Care needs to be taken not to cause an infinite nesting loop, where graph A is nested in graph B, nested in graph A.

The parameters of a nested graph need to be provided to the graph asset node's parameters input as a JSON string containing key-value pairs of the nested graph's parameters. For example:

{"Parameter A":3.14, "Parameter B":666,"Parameter C":42}

The graph asset node's URI input takes a graph assetURI, which triggers load (and compute) of this referenced graph on compute of the parent graph's graph asset node. Example of an asset URI:

whp:d65f2b43-7c90-4f45-97d0-d03b93abff85

Ephemeral behavior

A nested graph inherits its ephemeral state from its parent graph. Specifically, a graph asset node will retrieve its parent graph's ephemeral state and forwards the state to its internal graph object only at the node's compute time, before the internal graph is evaluated.