This document discusses XML databases and effective search engines. It describes how XML is a self-describing format that can store data in a portable way. While XML lacks features of traditional databases like efficient storage and indexing, XML databases address these issues. The document outlines how XML databases can store, search, retrieve and display XML documents and compares them to relational databases. It also provides examples of technologies and modules that can be used to parse, insert, query and synchronize XML documents with databases.