code: public CmsJspNavBuilder getNavBuilder() {
  
          if (m_navBuilder == null) {
              m_navBuilder = new CmsJspNavBuilder();
              m_navBuilder.init(m_cms, null, getSitePath());
          }
          return m_navBuilder;
      }
docs: Returns the navigation builder for this resource.<p>
  
  This will be initialized with this resource as default URI.<p>
  
  @return the navigation builder for this resource