Service message model (canonical data models)
服务消息模型（规范数据模型）
We just went from one version of data models to another.
我们刚刚从一个版本的数据模型转到另一个版本的数据模型。
The difference is due to different supported data models.
不同之处在于，有不同的受支持数据模型。
Alternate data models are easily supported, as shown here.
可以很容易地支持备用数据模型，如下所示。
The project needs to consider, at least in part, existing data models.
项目需要考虑已有的数据模型（至少需要考虑一部分）。
First, we declare two data models instead of one as shown in listing 3.
首先，我们将声明两个数据模型(而不是一个)，如清单3所示。
It can also ease the mapping from business requirements to data models.
它还可以简化业务需求与数据模型之间的映射。
One is discrete choice models and the other is count data models.
常用的统计模型主要包括两种：离散选择模型和计数模型。
There is one more thing we need to consider before creating our new data models.
在创建新数据模型之前，还有一件事需要考虑。
Why do people want to create (nearly) complete data models early in the project?
为什么人们要在项目的初期创建(几乎)完整的数据模型？
A prime example is physical data models that directly manipulate SQL data Definition Language.
一个很好的例子就是直接操作SQL数据定义语言的物理数据模型。
Data models are the bases of an appliance geography information system.
数据模型是建设应用型地理信息系统的基础。
Data models quickly become very large with many entities and relationships.
数据模型很快就会变得非常庞大，包含很多实体和关系。
Data models quickly become very large with many entities and relationships.
数据模型很快就会变得非常庞大，包含很多实体和关系。
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