<uri>fess.tags.functions</uri>
  
  <function>
    <description>
      Returns a label name.
    </description>
    <name>labelexists</name>
    <function-class>org.codelibs.fess.taglib.FessFunctions</function-class>
    <function-signature>java.lang.Boolean labelExists(java.lang.String)</function-signature>
    <example>
      ${fe:labelexists("value")}
    </example>
  </function>

  <function>

                    }
                    return 0L;
                }
            });

    protected FessFunctions() {
        // nothing
    }

    public static Boolean labelExists(final String value) {
        return LaRequestUtil.getOptionalRequest().map(req -> {
            @SuppressWarnings("unchecked")