This article is also helpful to explain the restrict and contra-restrict relation between semantic requirement and the syntactic form.
这对解释语义要求与句子形式的制约与反制约关系有着一定的说服力。
At some point in the future, the DBA may want to create a new table for separation of application data, but this is strictly a logical and semantic requirement and is not required by the database.
以后的某个时候，DBA可能希望创建一个新的表来分隔应用程序数据，但这仅仅是一个逻辑和语义需求，不是数据库的要求。
Secondly, in the paper a user's requirement model has been proposed using the ontology theory that presented by descriptive logic, the model adequately expresses the semantic information of users.
第二，提出了利用描述逻辑表示的本体理论来表达用户需求的模型，该模型可以充分表达用户需求中的语义信息；
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