- 正則樹
- regular: adj. 1.有規(guī)則的，有規(guī)律的；有秩序的，井井有條的， ...
- tree: n. 1.樹〔主要指喬木，也可指較大的灌木〕。 ★玫瑰可 ...
- regular tree grammar: 正則樹文法
- regular tree transformation: 正則樹變換
- on a regular: 以定期的方式
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regular tree中文什么意思
- 正則樹
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例句與用法
- Regular tree transformation
正則樹變換 - Regular tree grammar
正則樹文法 - Aiming at this problem , the main research issues and achievements in this paper are as follows : bi - directional data transformation between rdb and xml with semantic constraints preserved for most of existing researches on static data transformation between xml and rdb , dtd is taken as the schema description language for xml , and the semantic constraints are often lost during the transformation process . to overcome these disadvantages , the author adopts xml - schema , a standard schema description language proposed by w3c to replace dtd , as the description method owing to its more powerful functions than dtd , and of course with the syntax much more complicated . after analyzing the constraints characteristics in both xml - schema and relational schema , a semantic constraints - preserved algorithm is proposed which can realize the bi - directional schema mapping between rdb and xml through a formalized description of xml based on regular tree and a general expression for relational schema based on direct graph approach
保留語義約束的xml與rdb雙向靜態(tài)數(shù)據(jù)轉(zhuǎn)換技術(shù)現(xiàn)有研究大多采用dtd ( documenttypedefinition ，文檔類型定義)作為xml的模式描述語言，并且在模式映射過程中丟失語義約束信息，本文分析了xml - schema ( xml - schema采用與dtd完全不同的語法，數(shù)據(jù)描述能力更強(qiáng)同時也更為復(fù)雜，已被w3c確定為替代dtd作為xml模式描述語言的標(biāo)準(zhǔn))及關(guān)系模式的語義約束特征，通過基于正則樹的xml形式化描述方法以及基于有向圖的一般關(guān)系模式表示方法的研究，建立保留語義約束的xml - schema與關(guān)系模式的雙向模式映射算法，實(shí)現(xiàn)了xml與rdb的雙向數(shù)據(jù)轉(zhuǎn)換，較好地解決了xml與rdb在靜態(tài)數(shù)據(jù)轉(zhuǎn)換層面的數(shù)據(jù)集成問題，可有效滿足企業(yè)大量rdb數(shù)據(jù)面向xml的發(fā)布以及與日俱增的xml數(shù)據(jù)存入rdb的應(yīng)用需求。