document: Constructing extensible XQuery mappings Constructing and maintaining semantic mappings are necessary but troublesome in data sharing systems . While most current work focuses on seeking automated techniques to solve this problem , this paper proposes a combination model for constructing exten-sible mappings between XML schemas . In our model , complex global mappings are constructed by first defining simple atomic mappings for each target schema element , and then combining them using a few basic operators . At the same time , we provide automated support for constructing such combined mappings .
doc_bio_tags: O O B O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O B I O O O O O O