Design and implementation of efficient storage schemas and low-level storage manager for GML documents

GML is a markup language presented as exchange standard for geographic information by the OGC (Open GIS Consortium). In spatial network databases, researches for supporting GML (Geographic Markup Language) can be divided into parsing, storing and retrieval of GML documents. Among them, the study on the storage of GML documents is essential for their efficient retrieval. However there is little research on the storing of GML documents whereas there have been a lot of researches on the storing of XML documents. Because the storage schema designed for XML documents are not appropriate for geographic information, we, in this paper, propose three storage schemas for efficiently storing GML documents including geographic information in order to solve the problem that the XML storage schema store duplicate data and need to search many tables for obtaining elements. In addition, we design and implement a storage manager which can store GML documents using proposed GML storage schema.