The document discusses XML Sapiens, an open source project that aims to provide a unified approach to building websites using XML and PHP by separating user interfaces, application logic, and data through a model-view-controller paradigm. XML Sapiens allows non-programmers to implement web user interfaces and provides a natural separation of UI code, application logic code, and data representation through the use of XML. The project is created by web developers to evaluate a site building concept that is convenient for use with content management systems.