{ | }
    value-expr { ^ } value-expr ...

    Combines two value expressions by joining the second expression
    to the end of the first expression.

    You can combine value expressions of any kind, including numeric
    expressions, string expressions, and literals.

    The vertical bar (|)  specifies a value through combining one or
    more value expressions. The circumflex character (^)  specifies a
    value through combining one or more value expressions using SQL
    concatenation rules.