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A tree structure is a powerful tool for storing and manipulating all kind of data, without differences is it used for natural language analysis, compiling computer languages or storing and analyzing scientific or business data. Algorithms for searching and browsing tree structures are well known, and for free are available numbers of tools for manipulating tree structures implemented in different computer languages. Even is impossible to avoid these algorithms and tools, primary focus in this paper is XML and XML tools. Storing and retrieving, as well as validation of XML tree structures in relational database can be a challenge. This document describes these challenges and currently available solutions.

Implementation of the Tree Structure in the XML and Relational Database