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AbstractBeing an important data exchange and information storage standard, XML has generated a great deal of interest and particular attention has been paid to the issue of XML indexing. Clear use cases for structured search in XML have been established. However, most of the research in the area is either based on relational database systems or specialized semi-structured data management systems.In this paper, we propose a method for XML indexing based on the Information Retrieval (IR) systemOkapi. Firstly, we review the structure of inverted files and give an overview of the issues of why this indexing mechanism cannot properly support XML retrieval, using the underlying data structures ofOkapi as an example. Then we explore a revised method implemented on Okapi using path indexing