The external schema and the semantics of each transaction are formally specified.
每个事务的外部模式和语义都被正式指定。
Use XML Schema to model the required and optional elements of your transaction.
用XMLSchema为您的事务中必需的和可选的元素建模。
User prepares and submits a transaction without the data item (the schema doesn’t state that the item is required).
用户准备好提交事务，但其中没有该数据项（模式中没有指出这一项是必需的）。
You can avoid schema changes by preparing inside a transaction, but note that you will need to use BEGIN IMMEDIATE to be sure the database is locked.
你可以避免模式变化，准备在一个事务，但是请注意，您将需要使用BEGINIMMEDIATE可以肯定的是数据库锁定。
You can avoid schema changes by preparing inside a transaction, but note that you will need to use BEGIN IMMEDIATE to be sure the database is locked.
你可以避免模式变化，准备在一个事务，但是请注意，您将需要使用BEGINIMMEDIATE可以肯定的是数据库锁定。
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