Assignment Operator (=)
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OPERAND-A = OPERAND-B
The assignment operator (=) is used in SET update expressions to assign the value of the right operand (OPERAND-B) to the left operand (OPERAND-A).
The left operand should be either an attribute variable (ATTRIBUTE) or an element of an array attribute variable (ATTRIBUTE[i]).
Note
In the current release, the support for array attributes and the use of array operators and functions in expressions is restricted to the web APIs.