In order to show more clearly how this methodology may be applied, the paper considers the specific object-oriented data model IFO. Standard cartographic primitives are represented using IFO, which are then used in the modelling of some standard administrative units in the United Kingdom. The ...
Object-OrientedModel(OOM) 面向对象模型,一个OOM包含一系列包,类,接口 , 和他们的关系。 这些对象一起形成所有的 ( 或部份) 一个软件系统的逻辑的设计视图的类结构。 一个OOM本质上是软件系统的一个静态的概念模型。 (1)利用UML描述系统结构 (2)利用类图生成不同语言的源文件(如Java、C#、PowerBuilder等),...
网络释义 1. 面向对象模型 4.面向对象模型(object-oriented model)面向对象数据模型的核心概念: (1)对象和对象标识(OID):对象是现实世界中实体 … hi.baidu.com|基于59个网页 2. 面向对象的模型 Frontpage的对象模型,Frontpage Object... ... )object-oriented model面向对象的模型) model object 模型对象 .....
Data Model Issues for Object-Oriented Applications. Presented in this paper is the data model for ORION, a prototype database system that adds persistence and sharability to objects created and manipulated i... J Banerjee,HT Chou,JF Garza,... - 《Acm Transactions on Information Systems》 被...
This paper describes MDM, an object-oriented data model that supports instance-level evolution and associative queries. The MDM type system, based on abstract types and conformity, allows flexibility in defining applications and interacts well with the query facility. The query algebra consists of a...
In this paper, we introducea programing method which is hierarchical, inheritable, modularized, and maintainable──oioject-orented programming technolog, and discuss how to use this technology to construct a general framework of virtual environmentdata model.关键词: virtual reality(VR) technology ...
O2, an object-oriented data model The Altair group is currently designing an object-oriented data base system called O2. This paper presents a formal description of the object-oriented data... C Lécluse,P Richard,F Velez - 《Acm Sigmod Record》 被引量: 594发表: 1988年 O2, an object-...
To create data infrastructure, disaggregate trip surveys are conducted and large numbers of observations are collected. To efficiently exploit these surveys, the transfer of the individual trip data to a GIS must start with the development of a solid conceptual data model that fully captures the ...
The high level object oriented data model TM, based on an extension of the typetheory of Cardelli, is addressed. TM includes a logical formalism for constraint specification, which is an important aspect of the data model, and the notion of predicative sets. Predicative set expressions provide ...
Object-Oriented Data Model has the merits of repeat u sing of objects, reducing the chance of error, conveniecy to maintain and so on. 面向对象数据模型相对于现在应用广泛的关系数据模型具有对象可复用、错误机会减少、维护方便等优点 ,是当前正在发展的数据模型 ,也是数据库最有前途和生命力的发展方向...