由于域模型方法被标记为MANDATORY，客户机b将得到一个TransactionRequiredException，表示事务需要调用该方法。
Because the domain model method is marked MANDATORY, Client B will experience a TransactionRequiredException indicating that a transaction is required to invoke the method.
接着，介绍了域数据模型的一般概念，包括域数据模型的描述、域关系的表示和运算、基于域数据模型的访问控制方法等。
Then, the theories of DDM is fully explained in the paper, including the description of DDM, the denotation and operation of domain relation, and the access control method based on DDM.
通过运用在域上任何矩阵都是两个对称矩阵乘积的结论，给出了一种辛矩阵的表示方法。
In this paper, the author gives a kind of expression of symplectic matrices by using the result that any matrix on a field is a product of two symmetric matrices.
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