Example:
package P model M extends A.B(a = 1.0, x(z = 2.0)); end M; end P; setExtendsModifierValue(P.M, A.B, x.y, $Code((start = 3.0))) => package P model M extends A.B(a = 1.0, x(z = 2.0, y(start = 3.0))); end M; end P;
function setExtendsModifierValue input TypeName className; input TypeName extendsName; input TypeName elementName; input ExpressionOrModification modifier; output Boolean success; end setExtendsModifierValue;