──<arithmetic expression>──<relational operator>───────────────────────► ►─<arithmetic expression>──────────────────────────────────────────────┤
<relational operator>
──┬─<string relational operator>─┬─────────────────────────────────────┤ ├─ IS ─────────────────────────┤ └─ ISNT ───────────────────────┘
<string relational operator>
──┬─ LEQ ─┬────────────────────────────────────────────────────────────┤ ├─ <= ──┤ ├─ LSS ─┤ ├─ < ───┤ ├─ EQL ─┤ ├─ = ───┤ ├─ NEQ ─┤ ├─ ^= ──┤ ├─ GTR ─┤ ├─ > ───┤ ├─ GEQ ─┤ └─ >= ──┘
An arithmetic relation performs an arithmetic comparison of the values of two arithmetic expressions. The value of the relation is either TRUE or FALSE.

