For this use case, I removed the order details section from my PurchaseOrder schema to keep things simple.
对于这个用例，为简单起见我从PurchaseOrder模式中除去了订单细节部分。
Start by constructing a schema factory and use it to build an in-memory representation of the purchase order schema.
首先构建一个模式工厂，并使用它建立订单模式的内存中表示。
As you can see, you are getting much closer to the hand-crafted example purchase order schema in the primer, except for two more issues.
正如您所看到的，您与入门中手工的购买订单模式示例更加接近了，但是还有以下两个区别。
Front-back schema, up-down schema, linear order schema and the mixed use of various image schemata are dealt with in details in this chapter.
这一章结合古汉语诗歌实例，详细分析前后图式、上下图式、线性图式以及这些图式在诗歌中的混合使用。
Then retrieve an instance of a DOM factory, and set the purchase order Schema on the factory. Then you create a DOM parser using the DOM factory.
然后检索DOM工厂的实例，在该工厂上设置订单Schema，使用这个 DOM 工厂创建 DOM解析器。
For simplicity, in the sample code in Listing 1, we use an XML document (po.xml) that describes a purchase order and the purchase order schema (po.xsd).
为了简化起见，清单1的示例代码中使用了一个描述订单的xml文档(po . xml)，以及一个订单模式(po . xsd)。
This is an example service that accepts, cancels, and gets the status of a customer order, represented by the order schema developed in Part One of this series.
这个实例接收、取消，并获得客户订单的状态，由本系列第一部分中所开发的订单方案所表示。
The problem here is that the order of elements in the schema must not change from one conversion to another.
这里的问题是模式中的元素顺序在转换成另一个模式时不一定改变。
My main rule of thumb for element schema order is: Use ordered patterns unless you have specific reason not to.
对于元素的模式顺序，我的基本实践经验是：除非有特殊原因，否则应使用有序范式。
For example, if you manage data in hash tables or other unordered data structures in the application domain, you might face additional work re-assembling elements into the order set by a schema.
比方说，如果在应用领域采用哈希表或者其他无序数据结构管理数据，可能会面临着将元素按照模式中的顺序设定重新装配的额外工作。
If an element declaration has type alternatives, they are evaluated in the order that they were specified in the schema.
如果元素声明具有类型替换，那么将按照在模式中指定的顺序进行计算。
Do not change the order of the elements on the schema when the queries consider ordered predicates.
如果查询涉及到顺序谓词，不要改变模式中的元素顺序。
In this case, the schema generated from the UML models can be directly consumed by the IRAD tools — for instance, in order to generate SQL code.
在这种情况下，从UML模型中产生的计划可以被IRAD工具消耗——比如说，为了产生SQL代码。
This was done to avoid a situation where a schema processor would need to somehow guess the types of the attributes in order to determine the type of the element.
这样做是为了避免模式处理程序为判断元素类型而猜测属性类型的情况。
A description of the order of importing the export files into the destination schema.
关于向一个目的方案导入导出文件的顺序的描述。
Migration of mapping document: Users need to migrate their DAD to annotated XML schema in order to use the new functions.
映射文档的迁移：用户需要将他们的dad迁移到带注释的XML模式，以便使用新的功能。
In order for the service gateway to parse the headers in the request message, the schema for those headers must be available at runtime, and you must define the business object.
为了使服务网关解析请求消息中的头部，那些头部的架构必须在运行时可用，且必须定义业务对象。
In order to implement this governance framework, we'll define an XML document and an associated schema to detail the rules.
为了实现此控制框架，我们将定义一个XML文档和一个关联的模式来详细说明该规则。
Because of the complexity of the query language and the need to understand the data schema in order to compose the queries, training is required to use these applications.
由于查询语言的复杂性，并且要构成查询还需要了解数据模式，所以需要进行培训才能使用这些应用程序。
In order for machines to effectively exploit information, every unique schema of information needs to be standardised in a media type and for those media types to be individually identified.
为使计算机有效地挖掘信息以及多媒体类型能够被个性化地标识，多媒体类型信息中的任何唯一的格式都应该标准化。
Users do not need to pre-define an XML data structure (or, more accurately, an XML schema) in order to store their data.
用户不需要预定义XML数据结构（或者，更准确地说，XML模式）就可以存储数据。
We have tried to keep the purchase order table schema simple in the relational-only database by storing the purchase order document as a BLOB.
我们已经通过将采购订单文档存储为 BLOB，在基本关系数据库中尽量保持采购订单表模式简单。
To validate XML data, you need to define an XML schema that specifies acceptable XML elements, their order and data types, and so on.
要验证XML数据，需要定义一个 XML模式，它指定了可接受的 XML元素、它们的次序和数据类型，等等。
Novice users can easily drag elements around the diagram to change the order of the data elements in the schema.
新手可以轻松地在图上拖动元素，从而改变数据元素在模式中的次序。
Listing 7 shows the schema for the purchase order.
清单7显示了购买订单的模式。
We may even find that we need to refactor some aspects of the existing database schema in order to maintain the quality of the database design.
为了维护数据库设计的质量，我们甚至可能发现，需要重构现有数据库方案中的某些方面。
Listing 8 shows the schema for the order summary.
清单8显示了订单汇总的模式。
This time a WXS data type is assigned to the attribute, reflecting the schema designer's assumption that the purchase order number should be constrained to an integer.
这一次，WXS数据类型被指定给了该属性，这反映出模式的设计人员认为订单号应该限制为一个整数。
However, in some situations, it is necessary for multiple designers to work on a schema at the same time in order to speed up development.
但是，在有一些情况下，多个设计师需要同时处理一个方案以加快开发的进度。
Because the tools are weak, start-from-WSDL also requires a solid understanding of both WSDL and schema in order to obtain good results.
因为工具软弱，“由wsdl开始”还需要扎实理解WSDL和模式，这样才能获得良好的效果。
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