# nesting group (see `parent`) is bigger
var in_nesting: POSetElement[MGroup]
# Is `self` the root of its project?
fun is_root: Bool do return mproject.root == self
# nesting group (see `parent`) is bigger
var in_nesting: POSetElement[MGroup]
# Is `self` the root of its project?
fun is_root: Bool do return mproject.root == self