<structure block reference assignment>

──<structure block reference variable>── := ───────────────────────────►
►─┬─<null value>─────────────────────────────────────────┬─────────────┤
  ├─ THIS ─┬─────────────────────────────────────────────┤
  │        └─ ( ──<structure block type identifier>── ) ─┤
  ├─<structure block variable identifier>────────────────┤
  ├─<structure block array element>──────────────────────┤
  └─<structure block reference variable>─────────────────┘

A structure block reference assignment associates a structure block reference variable with a particular structure block instance.