<?php 


class Alternc_Diagnostic_Diff{
    
    /**
     * 
     * @param type $file_reference_1
     *          Either a number or a string refering to the file
     *          Default = Last file
     * @param type $file_reference_2
     *          Either a number or a string refering to the file
     *          Default = pre-last file
     */
    function compare($file_reference_1, $file_reference_2){
        
    }
    
    /**
     * Finds a file by reference or name
     * 
     * @param string $file_reference
     * @return Alternc_Diagnostic_Data Resulting data
     */
    function resolve( $file_reference){
        
    }
}