Another, more compact way to represent the same expression is to use an assignmentstatement similar to this.
另一种更紧凑的表达方式是使用下面这样的赋值语句。
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This is the first time that this example is using a relation as a declarative statement to define an expression (in other words, a value assignment) instead of using it for model-to-model mapping.
In writing an assignmentstatement, for example, you can declare variables of any type, use any identifier to the left of the equal sign, and supply any expression on the right.