This is a wrapper for read.table.
The text file should contain three columns with the column names patID, structure, constraint in the first line. Each further line then defines one constraint and the scope it applies to in terms of patients and structures. See checkConstraint for the definition of a constraint and for the definition of a scope. Example content:
"patID" "structure" "constraint"
"*"     "HEART"     "D1CC < 20Gy"
"234"   "*"         "V10% > 8CC"