Defined in file cn3d.asn
C++ class: CCn3d_user_annotation

Cn3d-user-annotation ::= SEQUENCE {
    name VisibleString,                 -- a (short) name for this annotation
    description VisibleString OPTIONAL, -- an optional longer description
    style-id Cn3d-style-table-id,       -- how to draw this annotation
    residues SEQUENCE OF Cn3d-object-location,  -- which residues to cover
    is-on BOOLEAN   -- whether this annotation is to be turned on in Cn3D