对异构型分布数据源的统一访问
数据服务中间件的主要功能包括数据的位置透明性、分布式数据查询、事务处理、异构数据源兼容。
Main functions of data access middleware are location transparency, distributed data query, transaction process and heterogeneous data sources compatibility.
在分布异构的数据源之间不仅存在模式异构，而且存在上下文异构。
There exist both schema and context heterogeneity between distributed, heterogeneous data sources.
通过在不同的应用系统和数据源之间建立联系，SOA能够将各种异构应用集成起来并组成灵活的分布式应用系统。
By building the relations between different kinds of application systems and data sources, SOA can integrate the heterogeneous applications and make up the flexible distributed application system.
基于本体的语义信息集成主要解决分布异构的数据源之间的模式级异构和部分数据异构（包括同义字和同音异义字）。
Ontology-based semantic information integration resolves the schema level heterogeneity and part of data level heterogeneity between distributed data sources.
基于本体的语义信息集成主要解决分布异构的数据源之间的模式级异构和部分数据异构（包括同义字和同音异义字）。
Ontology-based semantic information integration resolves the schema level heterogeneity and part of data level heterogeneity between distributed data sources.
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