Could not use FLOWDIRECTION_IN_LITERAL in SysMLProfile class defined in com.nomagic.magicdraw.sysml.jar

Hello, I need to use FLOWDIRECTION_IN_LITERAL in my plugin. I have add the dependency jar package com.nomagic.magicdraw.sysml.jar. and import com.nomagic.magicdraw.sysml.util.SysMLProfile; 
But when cannot find FLOWDIRECTION_IN_LITERAL in SysMLProfile.

Could you please tell me how to use the fields defined in SysMLProfile?