ceylon/ceylon-compiler — comment on commit 0cdd865d8fd78eef9087523fd1cbdb2a493b92eb
File: src/com/redhat/ceylon/ceylondoc/ClassOrPackageDoc.java line 59
By quintesse:

Because it isn't a Scope I imagine.
A Scope can have members, it means it can have other declarations inside of it.
A Value doesn't fit that description.