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package org.apache.directory.server.ntp.messages;


    import java.util.Arrays;
    import java.util.Collections;
    import java.util.List;


    /**
     * Reference Identifier: This is a 32-bit bitstring identifying the
     * particular reference source. In the case of NTP Version 3 or Version
     * 4 stratum-0 (unspecified) or stratum-1 (primary) servers, this is a
     * four-character ASCII string, left justified and zero padded to 32
     * bits. In NTP Version 3 secondary servers, this is the 32-bit IPv4
     * address of the reference source. In NTP Version 4 secondary servers,
     * this is the low order 32 bits of the latest transmit timestamp of the
     * reference source. NTP primary (stratum 1) servers should set this
     * field to a code identifying the external reference source according
     * to the following list. If the external reference is one of those
     * listed, the associated code should be used. Codes for sources not
     * listed can be contrived as appropriate.