Book excerpt explores the origins of the xml query language 書摘:探索xml查詢語言的起源
The need for an xml query language xml查詢語言的需求
Therefore, each operator in an xml query language must be well defined for all these possible inputs 因此,應(yīng)為所有這些可能的輸入很好地定義xml查詢語言中的每個(gè)運(yùn)算符。
First, a processing model of xquery query engine is proposed from the research of xml query language . second 首先研究了xml查詢語言,提出了支持xquery的xml查詢系統(tǒng)的體系結(jié)構(gòu)和實(shí)現(xiàn)方法。
One of the earliest activities of the query working group was to draw up a formal statement of requirements for an xml query language query工作組的早期活動(dòng)之一就是起草xml查詢語言需求的正式聲明。
To exploit this flexibility, an xml query language must provide features for retrieving and interpreting information from these diverse sources 為了利用這種靈活性,一個(gè)xml查詢語言應(yīng)該提供檢索和解釋不同數(shù)據(jù)源信息的特性。
Nevertheless, throughout the design process, a reasonably stable consensus existed in the working group about at least some of the principles that should underlie the design of an xml query language 盡管如此,整個(gè)設(shè)計(jì)過程中,工作組至少在設(shè)計(jì)xml查詢語言應(yīng)遵守的部分原則上達(dá)成了相當(dāng)穩(wěn)定的一致意見。
Recognizing the importance of an xml query language, the world wide web consortium organized a query language workshop called ql 98, which was held in boston in december 1998 認(rèn)識(shí)到xml查詢語言的重要性,萬維網(wǎng)聯(lián)盟(worldwidewebconsortium,w3c)于1998年12月在波士頓組織了一場(chǎng)名為ql98的查詢語言專題討論會(huì)。
The architecture provides xml global views over heterogeneous relational databases by publishing relational data as xml, and allows outer users to access these views directly or query them using xml query language 提出了一種異構(gòu)數(shù)據(jù)庫信息共享框架,該框架通過將關(guān)系數(shù)據(jù)發(fā)布為xml文檔,來提供異構(gòu)關(guān)系數(shù)據(jù)庫的xml全局視圖,允許外部用戶直接訪問或使用xml查詢語言查詢這些視圖。
The web is becoming a major conduit for people to obtain information, so the research on data integration under web environment is very flourishing in recent years . the paper primarily contains five parts : at first, we put forward an xml data model named xtree . based on the model, the author designed a novel xml query language called anxql 本論文以xml技術(shù)為基礎(chǔ),研究web環(huán)境下集成多個(gè)自治異構(gòu)數(shù)據(jù)源將會(huì)遇到的問題,研究的核心集中于自治異構(gòu)據(jù)源的集成查詢處理,主要包含以下五個(gè)方面的內(nèi)容:以一種半結(jié)構(gòu)化數(shù)據(jù)模型為基礎(chǔ)提出了一種xml數(shù)據(jù)模型表示-xtree。