Content refers to text documents, while the structure refers to how the document is logically organized. focus strategy is of particular benefit to the repository containing information on long documents, or documents covering various topics, in which users are directed to the most relevant content in the document. Application of increasing XML document to represent the structure requires the development of tools to effectively access documents marked-up in XML. This book provides a detailed description of the query language, indexing strategies, ranking algorithms, presentation of scenarios developed for accessing XML documents. Contents: Introduction / Basic Concept XML / Historical Perspective / Query Language / Indexing Strategies / Strategy Rating / Presentations strategy / Evaluating XML Retrieval Effectiveness / Conclusion