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schema description language中文什么意思

發(fā)音:   用"schema description language"造句

例句與用法

  1. 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。
  2. Virtual ontology data source shields the detail of low - leveldatasource , andprovides aconsistentaccessinterfacefortopperusers . wediscussedthemethodof transforming relation database to virtual ontology data source ( which is also called databasedeep annotation ) . we designed the database schema description language and mapping rulesdescriptionlanguage , andgavearesolventforrelationmodeling . at last , we bring out a framework of general natural language interface , and implement adatabasenaturallanguageinterface . makinguseofaspecificexample , wemadeanevaluationofthissystem
    我們具體討論了從關(guān)系數(shù)據(jù)庫系統(tǒng)到虛擬本體數(shù)據(jù)源的轉(zhuǎn)換(也稱為數(shù)據(jù)庫深度注解) ,定義了關(guān)系數(shù)據(jù)庫的結(jié)構(gòu)知識描述語言和通用的映射規(guī)則描述語言,給出了多元關(guān)系建模的解決方案。

相關(guān)詞匯

相鄰詞匯

  1. schema data description language 什么意思
  2. schema data item 什么意思
  3. schema ddl 什么意思
  4. schema declaration 什么意思
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