Based on the analysis of watermarking and proxy server, this paper proposes a design and implementation procedure of digital library.

在对数字水印和代理服务器的分析上，给出了基于服务代理服务器数字水印的数字图书馆的设计与实现过程。

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According to the processing procedure of query pre-compiler, this paper givens the general design and implementation of syntax analysis, semantics analysis in MDBI query pre-compiler.

按照查询预处理的处理过程，分别描述了MDBI查询预处理器中词法分析、语法分析、语义分析的设计和实现。

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The design and implementation of the procedure control system based on Programmable Controller are described.

阐述了基于可编程调节器程序控制系统的设计及实现方法。

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