This can include both constraints in general (for instance, not knowing what makes a good constraint), as well as a lack of knowledge regarding how to implement a constraint in a model.
这包含通常的约束(举例来说，不知道什么能形成好的约束)，和缺乏了解如何在模型中实现约束。
Objects have no inherent constraints, so explicit coding is required to implement the data validation.
对象没有固有的约束，因此要实现数据验证，必须进行显式编码。
Considering only pure business requirements is likely to result in service definitions that are impractical or impossible to implement, given the constraints of existing systems.
已知现有系统的约束条件，只考虑纯粹的业务需求很可能产生不实际或不可能实现的服务定义。
The sample code xmlcheckconstraint.db2 demonstrates how users can create a view on the different tables with same structure with check constraints and implement partitioning of tables by schema.
示例代码xmlcheckconstraint . db 2演示了如何为具有相同结构的不同表创建视图，该视图可以进行检查约束，以及按模式对表进行划分。
Unfortunately, XML Schema 1.0 did not provide a way to enforce these rules. To implement such constraints, you would.
不幸的是，XMLSchema 1.0并没有提供实施这些规则的途径。
It can well describe the role constraints using these transformation rules and formalization description methods, and helps to implement role assignment and composition.
使用这些转换规则及形式化描述方法可以清晰地描述角色间的约束关系，有助于设计者实现角色的分配及组合。
For pipeline laying constraints, the implement of constraints is proposed based on the pre-processing model in this paper.
针对管路敷设约束条件，本文给出基于预处理模型的约束实现。
Using a Green Belt and Yellow Belt approach addresses many of the constraints of smaller and mid-sized companies and allows them to implement at a more manageable pace.
应用绿带和黄带的方法解除了中小型公司的许多约束并使他们可以以更便于管理的方式应用(六西格玛)。
Using a Green Belt and Yellow Belt approach addresses many of the constraints of smaller and mid-sized companies and allows them to implement at a more manageable pace.
应用绿带和黄带的方法解除了中小型公司的许多约束并使他们可以以更便于管理的方式应用(六西格玛)。
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