Association inlining for mapping XML DTDs to relational tables

In this paper, we propose a new inlining method called the Association inlining for mapping DTDs to relational tables. It extends Shared inlining and Hybrid inlining to reduce relational fragments and excessive joins. In conjunction with the Association inlining, a Path table that contains relational schema information of the path from the root to every element is provided. The schema information extracted from the path table is exploited in processing XML queries. The performance of our method is compared to those of Shared and Hybrid inlining methods in terms of the number of joins and queries. The experiments shows that the number of joins of our method is less than that of Shared and the number of subqueries per query is less than that of Hybrid in general.