code: public String getVfsName(CmsObject cms, String rfsName) {
  
          CmsStaticExportData data = getRfsExportData(cms, rfsName);
          if (data != null) {
              String result = data.getVfsName();
              if ((result != null) && result.startsWith(cms.getRequestContext().getSiteRoot())) {
                  result = result.substring(cms.getRequestContext().getSiteRoot().length());
              }
              return result;
          }
          return null;
      }
docs: Returns the VFS name for the given RFS name, being the exact reverse of <code>{@link #getRfsName(CmsObject, String)}</code>.<p>
  
  Returns <code>null</code> if no matching VFS resource can be found for the given RFS name.<p>
  
  @param cms the current users OpenCms context
  @param rfsName the RFS name to get the VFS name for
  
  @return the VFS name for the given RFS name, or <code>null</code> if the RFS name does not match to the VFS
  
  @see #getRfsName(CmsObject, String)