Software maintenance , which consumes a large portion of software costs , is penalized by the difficulty of implementing changes in software products , and by the over - dependence of programs on the physical structure of the data they manipulate 消耗大部分费用的软件维护,受制与在软件产品中实现变化的困难性,受制与过于依赖所操作的物理数据结构
The xml document has a logical structure composed of declarations , elements , comments , character references , and processing instructions and a physical structure composed of entities , starting with the root , or document entity Xml文档具有逻辑结构(由声明、元素、注释、字符引用和处理指令组成)和物理结构(由实体组成,开头是根实体,即文档实体) 。
All of data logical relationship , data logical structure , data physical structure and data algorithm is the theme of the whole data structure course , even more , that also is an important problem in computer information process 摘要《数据结构》课程中数据的逻辑关系、逻辑结构、物理结构与算法是贯穿整个教材的主题,而这也是计算机信息处理过程中必须面对的一个重要的课题。
The nodes with different physical structure , different operating system different data structure , can exchange data freely with each other on the internet , using the technology of xml . they can also call the functions on the other node 利用标准的xml数据格式,网络中结构不同的节点可以互通信息、调用彼此的功能达到信息共享、资源共享的目的,从而充分发挥internet的作用。
In addition , it does not preserve physical structure that is , character and entity references , character encodings , or the standalone declaration , document information that is , the document type definition , or dtd , comments , or processing instructions 此外,它没有保留物理结构(即字符和实体引用、字符编码或独立的声明) 、文档信息(即文档类型声明或dtd ) 、注释和处理指令。
In contrast , michalis faloutsos of the university of california at riverside , petros faloutsos of the university of toronto and christos faloutsos of carnegie mellon university analyzed the physical structure of the internet 相较之下,美国加州大学河滨分校的米凯利斯法劳索斯、加拿大多伦多大学的佩特罗斯法劳索斯与美国卡内基美伦大学的克里斯多斯法劳索斯,则是分析网际网路的实体结构。
Then , we have classified those agents into three types : rigid economic agent , flexible economic agent and half - flexible economic agent . next , we have given their logic structure and physical structure , and described their running course 作者将微观经济主体分为刚性经济主体、柔性经济主体以及半柔性经济主体三种类型,分别构造了其逻辑结构和物理结构,并描述了各种类型经济主体的运作过程。
You need to thoroughly analyze the application requirements , understand the logical and physical structure of the data , assess database usage , and negotiate tradeoffs between conflicting uses such as online transaction processing oltp versus decision support 您需要透彻地分析应用程序要求,了解数据的逻辑结构和物理结构,评估数据库使用情况,并协商使用[如联机事务处理( oltp )与决策支持]冲突之间的平衡措施。