web services metadata 中文意思是什麼
web services metadata
解釋
服務元數據-
Tim berners - lee brought forward the concept of semantic web in 1998 and set the goal as to make computer process information automatically by adding metadata to traditional web data to make the latter machine - understandable. the clearer meanings of data and domain theory ( ontology ) are supposed to provide high quality services for web
1998年， timberners - lee提出了語義web的概念，目標是通過向數據中添加機器可理解的語義和啟發式的使用元數據來實現機器自動處理信息，數據的清楚語義加上領域理論（即本體）將使得web提供更高質量的服務。 -
Web services are networked components that can be invoked remotely using standard xml - based protocols. the key to automatically invoking and composing web services is to associate machine - understandable semantic metadata with each service
Web服務是基於xml的可被遠程調用的網路組件，自動調用和集成web服務的關鍵在於將機器可理解的語義元數據與web服務關聯起來。 -
This paper stresses on discussing the architecture, access protocol and implementation mechanism based on xml and web services technologies, researches key technologies of metadata information service and data uniform access and management in database grid, designs and implements distributed mis subsystem and das subsystem, which support multi - domain management. mis can provides metadata information for the whole system, such as das and clients, it uses domain name 、 logical name and internal name of data object to uniformly name database resources in grid and implements name mapping mechanism and user view metadata information service and provides virtual organization and management of database resources. das can provide a scalable uniform data access by virtual organization and management of storage resources and multi - mode data share access mechanism, thus integrate database resources in grid and shields distribution and heterogeneity of resources and achieves transparent access. system adopts data access mechanism based on user request mapping to flexibly implement data access across multi domains, and adopts distributed data cache mechanism 、 security mechanism based gsi to provide high - performance secure data service for grid users
本文論述了griddaen - dai系統的邏輯結構、訪問協議、數據服務流程以及基於webservices 、 xml等技術的實現策略，重點研究數據庫網格中的元服務、數據統一訪問和管理等關鍵技術，設計和實現了支持多管理域的分散式元服務子系統和數據訪問服務子系統。其中元服務主要為整個系統提供各種元信息支持，它採用域名、數據對象的邏輯名稱、物理名稱和內部名稱對廣域環境下的數據庫數據進行了統一命名，實現了相應的名字映射機制和全局的用戶數據視圖服務，提供了數據庫資源的虛擬組織與管理方式;數據訪問服務通過提供可擴展的統一數據訪問和支持多種數據共享訪問模式，屏蔽了數據庫資源的分佈性和異構性，為用戶提供了統一透明的數據服務。
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