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MSDN中用于定义以及如何理解它的语法是什么?定义的语法
connection-string ::= empty-string[;] | attribute[;] | attribute; connection-string
empty-string ::=attribute ::= attribute-keyword=attribute-value | DRIVER=[{]attribute-value[}]
attribute-keyword ::= DSN | UID | PWD | driver-defined-attribute-keyword
attribute-value ::= character-string
driver-defined-attribute-keyword ::= identifier
这是一种正则表达式吗?