关于check-mate的小问题

nomeno

刚刚接触checkmate，对于里面的checker不是很懂
比如第一个是干什么的，看不懂

information如下：
Check-Mate 类文档
检查器： %check_overslam_step
Description:
    This checker evaluates the length of a constructed line and step configuration for a
    common section cut through an area that display the Quarter Panel Beauty Step with
    overslam.  If the overslam steps and w line distance meet the checking constraints,
    then the check passes and no further check is required.  Otherwise, the checker will
    further evaluate the ratio between the Finished LOL and Drawn LOL.  The finished LOL
    is the total arc length of R1, R2, R3, and two lines that connect them.  The Drawn LOL
    is the curve that starts from the tangent of R1 and Class A Surface to the tangent
    of R3 and the 6-degree draft angle curve.
            
    Note: This template checker can only validate the current work part; otherwise, the
          selected geometry objects are not valid in any other parts.