Modeling Product as a meta-class makes our model more flexible in that adding additional Products to the Catalog is purely a data-driven process and doesn't impact the class model.
将其他Product添加到Catalog完全是一个数据驱动过程，而且不会对类模型产生影响，因此将Product建模为一个元类会使我们的模型更加灵活。
When you use a Model-Driven Development (MDD) approach, business process and data modeling can be easily integrated.
使用模型驱动开发（Model-Driven Development，MDD）方法，可以轻松集成业务流程和数据建模。
By analyzing dynamical data and engineering (requirement -) driven, PDM application frame is set up including person managing model, product object model and process managing model.
通过对动态数据特性的分析，建立了以工程需求为驱动，由人员管理模型、产品对象模型及过程管理模型等组成的PD M应用框架。
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