在外部范围中，错误处理程序包含一个其目标设置为内部范围的补偿活动。
In the outer scope, a fault handler contains a compensate activity whose target is set to the inner scope.
如果底层驱动程序不支持事务，那么将会抛出一个PDOException(无论错误处理设置是怎样的：这总是一个严重错误状态)。
If the underlying driver does not support transactions, a PDOException will be thrown (regardless of your error handling Settings: this is always a serious error condition).
接下来可以像处理一个简单SAX应用程序一样处理XMLReader实例，并设置一个错误处理程序。
You can then work with the XMLReader instance as you would with a straight SAX application which of course includes setting an error handler.
接下来可以像处理一个简单SAX应用程序一样处理XMLReader实例，并设置一个错误处理程序。
You can then work with the XMLReader instance as you would with a straight SAX application which of course includes setting an error handler.
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