Hello,
This is a good course from 2012 and may be using Processing 2.
Some resources:
- https://processing.org/tutorials/data
- https://processing.org/reference/XML.html
- Processing/libraries at master · mascot6699/Processing · GitHub < Library used in this project
- GitHub - n1ckfg/proxml: Port of @texone's proxml library to Processing 3, for maintaining old projects.
:)