CodeModel. Such an
element can appear when traversing a CodeModel unless otherwise
specified, be supplied to a CodeBuilder, and be processed by a
CodeTransform.
Code elements can be categorized into Instruction, PseudoInstruction, and Attribute. Unlike in other CompoundElement, the order of elements for all Instructions and some
PseudoInstructions is significant.
Membership Elements, ClassElement, MethodElement, FieldElement