XML模式演化对查询的影响。
兼容的XML模式演化。
本文提出了XML模式演化过程中变动的扩展分类。
This article has presented an extended taxonomy for changes that can happen during XML schema evolution.
我们详细讨论了模式演化对验证、查询公式和结果的影响。
We discussed the impact of schema evolution on validation, query formulation, and results in detail.
DB 2 9.7放宽了对象依赖规则，允许更灵活的模式演化。
DB2 9.7 has relaxed its object dependency rules to allow for more flexible schema evolution. For example, assume you had the following dependency.
而与之相反的另一端，一般XML用户对于管理模式演化无能为力。
On the opposite end, the plain XML user can do virtually nothing to manage schema evolution.
提出了基于路径无关语言的等价模式演化方案来解决这个问题。
This paper addresses the problem by providing equivalent schema evolution (ESE) mechanism based on path independence (PI) program.
示例代码xsupdate.db2演示了兼容的XML模式演化。
The sample code xsupdate.db2 demonstrates the compatible XML schema evolution.
实验发现，随电压的升高，六边形斑图是由弥散放电模式演化而成。
It is found that the hexagon pattern is transformed from diffuse mode by increasing the applied voltage.
具体来说，对于XML数据库，模式演化是 XML的迫切要求。
Specifically, for XML databases, schema evolution still is one of the demanding use cases for XML.
“XML模式变化分类”一节提出了模式演化过程中可能出现的变化类型。
In "taxonomy of XML schema changes," we present the taxonomy of changes that may happen during XML schema evolution.
在XML模式演化的过程中，有时候用不同的名称空间表示不同的模式版本。
In some cases of XML schema evolution, different namespaces denote different versions of the schema.
受天择压力，他们朝向耗能较少的移动模式演化，因而脊椎柱更长，更灵活。
Selection pressure for this efficient style of locomotion favored longer and more flexible spinal columns.
我们考虑了在XML模式演化过程中最常见的变化类型并提出了一种分类方法。
We consider the most common types of changes that can happen during XML schema evolution and propose a taxonomy for them.
可能的主要缺点JAXB和一般意义上的数据绑定，是它使模式演化非常麻烦。
Probably the main drawback of JAXB, and of data binding in general, is that it makes schema evolution very cumbersome.
还将讲述业务需求更改对数据的影响(模式演化)以及对应用程序代码和关系模式的影响。
We will also look into the effects of changes in the business requirements on the data (schema evolution) and its impact on the application code and the relational schema.
这一节讨论控制模式演化的实际问题，并提供出一组用于编写跨模式版本查询的指导原则。
In this section, we'll discuss practical issues involved in controlling schema evolution and present a compact set of guidelines for writing queries across schema versions.
由于上述这些原因，模式演化作为一项重要课题需要在关系、面向对象和XML数据库环境中加以研究。
For all these reasons, schema evolution is a very important topic that has been researched in the context of relational, object-oriented, and XML databases.
完整存储的好处是任何由于采购订单的变化(如运输等其他信息)而发生的模式演化都不会有什么影响。
An advantage of intact storage is that any schema evolution due to changes in the purchase order (additional information like shipping), is painless.
为了增加灵活性并提供更好的模式演化，DB 2V9.5为XML模式引入了update特性。
To increase the flexibility and provide better schema evolution, DB2 V9.5 introduces the update feature for an XML schema.
本文并没有介绍所有可能的情形，而是列举XML设计人员在模式演化过程中遇到的最常见的情形。
This work is not intended to exhaust the subject but rather to cover the most common situations an XML designer faces on schema evolution.
模式演化是OO系统中一个很关键的问题。由于OODB的应用具有动态特征，因而模式要经常改动。
Schema evolution is a key problem in object-oriented systems because the dynamic nature of typical OODB applications calls for frequent changes in the schema.
在这四种角色中，XML数据和应用程序架构师对于如何设计模式变化和应用程序来管理模式演化具有最大的自由度。
Of these four roles, the XML data and application architects have the most freedom in how they design their schema changes and applications to manage schema evolution.
您也可以捕获一些使用元程序和属性的惯用模式（见 “ 演化架构和紧急设计：利用可重用代码，第 2部分”）。
You can also capture some categories of idiomatic patterns using metaprogramming and attributes (see " Leveraging reusable code, Part 2").
为了满足新的需求，设计也在不断演化，关键对象承担着各种模式角色，直到它们变得难以使用或者难以修改，最终不得不重构或者重写系统。
As the design evolves to meet new needs, key objects are loaded with pattern roles until they become hard to use or hard to change and the system has to be refactored or rewritten.
这些例子很简单，说明如果查询中不涉及模式的演化部分就没有什么问题。
The examples are simple and show that there is no problem when the evolving part of the schema is not evaluated on any query.
这些模式代表了从ibm十多年丰富的WebSphereApplicationServer部署经验演化而来的深厚知识和最佳实践。
These patterns represent the deep knowledge and best practices that have evolved from over ten years of experience with WebSphere Application Server deployments.
在制定油气开发方案前，必须建立一个完整的构造演化、沉积作用、成岩作用的综合模式，进而预测有利构造沉积成岩相带。
So, before a development scheme of oil and gas is formulated, a synthetic model on structural evolution, sedimentation, and diagenesis should be set up to predict the favourable zones.
文中把本区和典型的逆掩推覆构造作了对比，并推断了这种缓倾角断层的演化模式。
The authors compared the structures of this area with the typical nappe patterns and proposed a evolution model of the low Angle faults.
本文提出了拉伸煤盆地最一般的沉积—构造模式，并用以解释盆地结构的演化和泥炭聚积的条件。
A generalized sedimentary-tectonic model for extensional coal basin is presented, together with the explanation for the evolution of basin architecture and the conditions of peat accumulation.
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