Besides , windows os does not open source code , and therefore network security specialists are unable to directly modify or add network protocol code to ensure the security of the os 此外， windows操作系统不开放源代码，网络安全专家无法直接修改、增加操作系统中关于网络协议实现的代码来改善操作系统的安全性。
Rather than using costly and restrictive electronic data interchange formats on value - added networks , companies can set up extranets for an open dialogue between customers and suppliers over the net 各公司可以在因特网上为客户和供应商之间建起用于开放对话的内扩网，而不是在增值网上使用既费钱又受限制的电子数据交换格式。
Based on the bus structure , some ideas from switcher and router were brought into the bus communication system : adding network layer on link layer , to improve the expansibility and performance of low - end bus - based distributed system 在总线式网络的基础之上，把交换式的概念引入到总线式通信系统中，并借鉴交换机和路由器中的一些优点，在链路层的基础上加入网络层，提高低端总线分布式系统的扩展性能和通信性能。
Early e - commerce is the traditional edi method . traditional edi is based on a strict standard set of transaction processing , it uses private network or value added network ( van ) , the costs are high and it is difficult to realize cross - platform and cross - system data exchange 早期的电子商务是传统的edi方式，传统edi基于严格的事务处理的标准集，且利用专网或增值网服务，成本高，难于实现跨平台跨系统的数据交换。
Its core is xquery ' s compiler which has some deficiencies . it can only query xml files which have schema . but in real life not all the xml files have schema , so we extend its function so that it can query no schema xml files ; furthermore , we add network function that can query url files on the web ; last , because it is impossible to construct data models of all the xml files , we adopt dymanic construction Xqueryjavaapi的核心是已经实现的xquery编译器，它具有一些局限性：只能查询有schema类型说明的xml文档，而在现实世界中，并非所有xml文档都有类型说明，所以，我们对xquery编译器进行扩展，使得它对没有类型说明的xml文档也可以进行查询；同样，为使查询更具有通用性，增加网络查询功能，实现对以url地址表示的xml文档的查询；另外，不可能事先构造所有文档的数据模型，所以对xquery查询实现的基础? ?数据模型应采取动态构造的方法：当需要查询某文档时才构造它。
