统一建模语言（UML）是一种面向对象、定义明确的可视化系统建模语言，在地理信息系统工程的分析和设计中已逐渐被采用。
The unified modeling language (UML) is an object-oriented and strictly defined visualizing data modeling language. It has been gradually adopted in analysis and design of GIS application engineering.
Paulo： UML最初是为了给面向对象系统建模而形成的，现在被看作通用的建模语言。
Paulo: UML was originally created to model OO systems. It's now considered a general purpose modeling language.
有关统一建模语言中的二元关系的介绍, 软件和系统建模期刊, vol.1, no.1, Springer-Verlag, September 2002.
Stevens, P., On the interpretation of binary associations in the Unified Modeling Language, Journal of Software and Systems Modeling, vol.1, no.1, Springer-Verlag, September 2002.
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