PROCESSOR-SDK-J721E: Setting data flow of Nodes about TIOVX and OPENVX APIs

Part Number: PROCESSOR-SDK-J721E

I already know that developing edge AI application relies on the APIs of OPENVX and TIOVX in the SDK.I now understand in app_single.camera that the first step is to create a context, then create a graph, and then create various nodes on the graph, such as VISS, LDC, DISPLAY, etc. I have one question:

Q: After execute the function vxVerifyGraph (obj ->graph); The order of data flow for each node has been set. I haven't understood it in the source code which APIs helps to config order of data flow,What model or concept is the connection of data flow between each node based on?Is there any link or document that I can know? I am currently using version 08.04 of the SDK

thank you!