Global constants are globally visible in a schema. However, as class and interface constants apply only to the class or interface in which they are defined (that is, more than one class or interface can have a constant of the same name), you must specify the class or interface to which a constant applies if referencing it outside of the defining class; for example:

myTbl.alignment := Table.Alignment_Center;

To access a constant defined in an interface, qualify it as interface‑name.constant‑name, not class‑name.constant‑name.