docs: protected String getRfsPrefixForRfsName(String rfsName) {
  
          String retVal = "";
          // default case
          if (rfsName.startsWith(m_rfsPrefix + "/")) {
              retVal = m_rfsPrefix;
          }
          // additional rules
          Iterator<CmsStaticExportRfsRule> it = m_rfsRules.iterator();
          while (it.hasNext()) {
              CmsStaticExportRfsRule rule = it.next();
              String rfsPrefix = rule.getRfsPrefix();
              if (rfsName.startsWith(rfsPrefix + "/") && (retVal.length() < rfsPrefix.length())) {
                  retVal = rfsPrefix;
              }
          }
          return retVal;
      }