Contents of this chapter:
20.1. VALUE
20.2. VARIANT-CHAR
20.3. VARIANT-CHAR-ASSIGN
20.4. VARIANT-CHAR-ASSIGNS
20.5. VARIANT-CHAR-REF
20.6. VARIANT-CHAR-VALUE
20.7. VARIANT-CHARS
20.8. VARIANT-DEF
20.9. VARIANT-DEFS
20.10. VARIANT-SPEC
20.11. VERBATIM