</b></span>;
        <span style="color:navy"><b>FUNCTION</b></span> isnull: boolean;
        <span style="color:navy"><b>PROPERTY</b></span> gridvalue[const index: integer]: realty
             <span style="color:navy"><b>READ</b></span> getgridvalue <span style="color:navy"><b>WRITE</b></span> setgridvalue; default;
        <span style="color:navy"><b>PROPERTY</b></span> gridvalues: realarty <span style="color:navy"><b>READ</b></span> getgridvalues <span style="color:navy"><b>WRITE</b></span> setgridvalue