Creating Multi-domain Query Plans on Data Services

In cloud computing environment, there are many individual data sources, including structured and semi-structured data such as relational data, XML, HTML and etc, usually depositing in different business systems, which has the ownership of each of the data. It is difficult to establish and maintain a unified multi-source data integration system. Data Services is a kind of software Services supplied by information systems. Data sources are packaged into Data Services in order to multi-steps data query. Data Services is element of cross-domain query in this paper. The modeling of Data Services supporting multi-steps data query and the method of creation multi-step data query plans are proposed.