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# filetree.h Example File
xmlpatterns/filetree/filetree.h

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     #include <QtCore/QFileInfo>
     #include <QtCore/QDir>
     #include <QtCore/QVector>
     #include <QtXmlPatterns/QSimpleXmlNodeModel>

     class FileTree : public QSimpleXmlNodeModel
     {
     public:
         FileTree(const QXmlNamePool &namePool);

         QXmlNodeModelIndex nodeFor(const QString &fileName) const;

         /* Reimplement pure functions in QAbstractXmlNodeModel. */
         virtual QXmlNodeModelIndex::DocumentOrder compareOrder(const QXmlNodeModelIndex&,
                                                                const QXmlNodeModelIndex&) const;
         virtual QXmlName name(const QXmlNodeModelIndex &node) const;
         virtual QUrl documentUri(const QXmlNodeModelIndex &node) const;
         virtual QXmlNodeModelIndex::NodeKind kind(const QXmlNodeModelIndex &node) const;
         virtual QXmlNodeModelIndex root(const QXmlNodeModelIndex &node) const;
         virtual QVariant typedValue(const QXmlNodeModelIndex &node) const;
         virtual QVector<QXmlNodeModelIndex> attributes(const QXmlNodeModelIndex &element) const;
     protected:
         virtual QXmlNodeModelIndex nextFromSimpleAxis(SimpleAxis, const QXmlNodeModelIndex&) const;

     private:
         enum Type {
             File,
             Directory,
             AttributeFileName,
             AttributeFilePath,
             AttributeSize,
             AttributeMIMEType,
             AttributeSuffix
         };

         inline QXmlNodeModelIndex nextSibling(const QXmlNodeModelIndex &nodeIndex,
                                               const QFileInfo &from,
                                               qint8 offset) const;
         inline const QFileInfo &toFileInfo(const QXmlNodeModelIndex &index) const;
         inline QXmlNodeModelIndex toNodeIndex(const QFileInfo &index,
                                               Type attributeName) const;
         /**
          * Same as above, but derives the type from the QFileInfo.
          */
         inline QXmlNodeModelIndex toNodeIndex(const QFileInfo &index) const;

         /*
          One possible improvement is to use a hash, and use the &*&value()
          trick to get a pointer, which would be stored in data() instead
          of the index.
         */
         mutable QVector<QFileInfo>  m_fileInfos;
         QVector<QXmlName>           m_names;
         const QDir::Filters         m_filterAllowAll;
         const QDir::SortFlags       m_sortFlags;
     };