tree schema 中文意思是什麼
tree schema
解釋
樹模式-
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雙向靜態數據轉換技術現有研究大多採用dtd （ documenttypedefinition ，文檔類型定義）作為xml的模式描述語言，並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採用與dtd完全不同的語法，數據描述能力更強同時也更為復雜，已被w3c確定為替代dtd作為xml模式描述語言的標準）及關系模式的語義約束特徵，通過基於正則樹的xml形式化描述方法以及基於有向圖的一般關系模式表示方法的研究，建立保留語義約束的xml - schema與關系模式的雙向模式映射演算法，實現了xml與rdb的雙向數據轉換，較好地解決了xml與rdb在靜態數據轉換層面的數據集成問題，可有效滿足企業大量rdb數據面向xml的發布以及與日俱增的xml數據存入rdb的應用需求。 -
Chapter 3 presents a method to represent schema architecture and schema mapping, prescribe an algorithm for decomposition tree. chapter 4 describes the implementation framework of multidatabase query processing, the implementation algorithm of query decomposition, approaches of query in the cmdatabase will be addressed
第三章提出了多數據庫系統cmdatabase的模式結構及模式映射方法，定義了用於多數據庫查詢處理的樹生成演算法第四章描述了cmdatabase的全局查詢處理的查詢分解演算法。 -
The feature of xrdb system is follow : the relation of xml element and it ' s son is keeped by relation - dictionary, as the same time the relation - dictionary keeped the element attributes, content and their corresponding in relation database. in order to get the more efficiency relation table, the dom tree of xml schema is trimed for getting orderliness xml schema. for efficiency rewrited path expression into sql, the relation dictionary keeps every xml element ' s absolute path
Xrdb系統的主要特色有：用關系字典保存xml元素的父子關系，元素的屬性，內容以及它們對應的關系數據庫表名，列名；對xml模式的dom樹進行修剪，使xml模式整潔，從而使映射得到的關系的更合理；關系字典保存了每個元素的絕對路徑，可以快速地把路徑查詢重寫為結構化查詢； xrdb的查詢結果是原來xml文檔的文檔片段。 -
It is a feasible way to manager spatial objects by utilizing relational database in the gis applications. we have brought to octa - tree index structure for managering spatial data efficiently in relational schema. by space filling curve, z - curve, we mapped rsdd to 1 - dimensional linear sp
為了在關系模式下有效地對空間數據進行處理，論文提出了八分樹的索引結構，並利用空間填充z一曲線把rsdd空間映射到一維空間，從而建立起了空間對象的索引順序。 -
Expand the tree and browse to the flights table under the tables folder for the app schema
展開樹，瀏覽至app模式的tables文件夾下的flights表。 -
Time - control schema on data aggregation tree
數據融合樹的定時控制策略 -
This paper refers to the indexing technologies of b ~ + - tree in dbms, and combine it with the sparse numbering schema, and proposes a new indexed structure ? b ~ + - tree structural index. it is very important for the optimization of join operation and element location in xml query
本文將關系數據庫中b樹索引技術與sparsenumberingschema相結合，提出了一種新的xml文件索引結構? ? b ~ +樹結構索引，它對xml查詢中連接操作和元素定位操作的優化有著重要作用。
分享友人