Self-maintainability of deletions of materialized views over XML data

To implement a XML data warehouse system, a key issue is how to efficiently maintain materialized views, to preserve their consistency with data sources when base data changes. Self-maintenance of views has been shown to dramatically improve performance for view maintenance, and studied extensively in the context of the relational data model. But for XML database, there are still lots of work left to be done. In this paper, we give a preliminary result on self-maintainability of deletions of views over XML data. We give a necessary and sufficient condition of self-maintainability of deletions, and an algorithm to implement self-maintenance of deletions of views for XML data.