valid prefix property [计] 有效前缀特性
In such a case, the configured property value is treated as a prefix to which a unique integer is appended.
在这种情况下，配置属性值被当作一个前缀，其后会附加一个唯一整数。
The built-in Concat function supports the specification of a prefix, postfix, and delimiters through its property page.
内置的 Concat 函数支持通过其属性页指定前缀、后缀和分隔符。
The connector prefixes these with a string that can be configured by setting the connector source context property prefix for Expression Columns.
连接器为这些数字添加一个字符串前缀，该字符串可以通过设置连接器源上下文属性Prefix for Expression Columns进行配置。
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