https://www.openproject.org/fr/blog/openproject-15-1-release/
Here's an overview of the major release of OpenProject 15.1: Among other changes, Enterprise customers can now use custom fields of type hierarchy.
custom fieldstype hierarchyopenproject
https://docs.oracle.com/en/java/javase/25/docs/api/java.compiler/javax/lang/model/type/package-tree.html
tree: module: java.compiler, package: javax.lang.model.type
model typeclass hierarchyjava sejavaxlang
https://docs.oracle.com/en/java/javase/17/docs/api/java.compiler/javax/lang/model/type/package-tree.html
tree: module: java.compiler, package: javax.lang.model.type
model typeclass hierarchyjava sejavaxlang