| 1. | Applications are freed from hard - coded dependencies on a particular data engine or storage schema
应用程序在编码上不依赖于特定的数据引擎或存储架构。 |
| 2. | The contributions of this dissertation can be summarized as following : 1 ) proposes the techniques of xml storage schema adaptation
具体来说： 1 )提出了xml数据在关系数据库中存储模式的自适应调整机制。 |
| 3. | Developers can work with a consistent application object model that can be mapped to various storage schemas , possibly implemented in different database management systems
开发人员可以使用一个相对稳定应用程序概念模型工作，并将这一模型映射到多种存储架构。例如不同的数据库管理系统的实现。 |
| 4. | Based on history queries , storage schema can be automatically adjusted for improving query - processing efficiency . four kinds of schema adaptation strategies are given , in which two are used for automatic schema adaptation
同时，还提出了四种存储模式调整策略，其中两种策略可以实现自适应存储模式调整。 |
| 5. | The efficiency of xml management system depends on its storage schema . under the condition that user ' s queries are given or expected , designing storage schema based on user ' s queries can improve the efficiency of system significantly
根据历史查询信息，系统在合理的时间内对其存储模式进行自动调整以产生高效的存储模式，从而提高系统的总体查询处理效率。 |
| 6. | Secondly , the author innovatively uses the xml to describe the data model and uses dom as the storage schema of courseware . whereafter , the author establishes the system ' s cooperative work model and describes the system ' s framework . at the end of this dissertation the author presents the technologies in the system ' s implementation at length
首先，论文介绍了cscw理论，详细介绍了xml技术以及课件的xml表示和存储模式；其次，依据cscw理论确立了系统的协同工作模型，设计了系统的总体结构和各部分的组成结构；最后，论文介绍了系统实现采用的具体技术。 |
| 7. | Under this condition , based on the concept of the part library in is013584 and the method of data transferring provided by step , this thesis constructs a system of open general part library and elucidates in detail the following three topics : organization of part resources , the storage schema of data of parts and data transferring between distinct cad systems , the part library management system based on web
在这种情况下，基于iso13584提出的零件库的概念和step标准提供的中性文件交换机制，本文构建了一个开放式的广义零件库系统的体系结构，并从企业零件资源的组织、零件库数据的存放形式和数据转换、基于web的零件库管理系统的设计和开发三个方面阐述了建立零件库系统的具体方法。 |
