The document is a paper on XML that includes an introduction to XML, its features, how it works with an example, advantages and disadvantages. It discusses that XML is a markup language that separates data from display, allows custom tags, and is used to structure data for storage and transport. An example shows how an XML file structures address data with name, contact, email and birthdate tags. The paper concludes it is important to design XML well for readability and maintainability when building applications.