code: public String getRfsName(CmsObject cms, String vfsName) {
  
          return getRfsName(cms, vfsName, null, null);
      }
docs: Returns the static export rfs name for a given vfs resource.<p>
  
  @param cms an initialized cms context
  @param vfsName the name of the vfs resource
  
  @return the static export rfs name for a give vfs resource
  
  @see #getVfsName(CmsObject, String)
  @see #getRfsName(CmsObject, String, String, String)