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/*!
    \example xmlpatterns/filetree
    \title File System Example

    Shows how QSimpleXmlNodeModel can be used to use XQuery on top of arbitrary data, in this
    case the file system.

    \section1 Overview

    The FileTree class, sub-class of QSimpleXmlNodeModel, uses QFileInfo internally for understanding
    files, but exposes them to the query engine as XML. Directories becomes a \c <directory/> elements
    and files \c <file/> elements. In addition they have attributes appropriately, to reflect paths,
    file sizes and names.

    FileTree keeps an array of QFileInfo instances, and create QXmlNodeModelIndex instances that has an
    integer which is an index into this array. The FileTree class and the query engine passes these
    back and forth when referring to nodes.
 */
