/// <summary>
        ///    Gets a specified unique file identifer frame from the
        ///    specified tag, optionally creating it if it does not
        ///    exist.
        /// </summary>
        /// <param name="tag">
        ///    A <see cref="Tag" /> object to search in.
        /// </param>
        /// <param name="owner">
        ///    A <see cref="string" /> specifying the owner to match.
        /// </param>
        /// <param name="create">
        ///    A <see cref="bool" /> specifying whether or not to create
        ///    and add a new frame to the tag if a match is not found.
        /// </param>
        /// <returns>
        ///    A <see cref="UserTextInformationFrame" /> object
        ///    containing the matching frame, or <see langword="null" />
        ///    if a match wasn't found and <paramref name="create" /> is
        ///    <see langword="false" />.
        /// </returns>
        public static UniqueFileIdentifierFrame Get(Tag tag,
                                                    string owner,
                                                    bool create)
        {
            UniqueFileIdentifierFrame ufid;

            foreach (Frame frame in tag.GetFrames(FrameType.UFID))
            {
                ufid = frame as UniqueFileIdentifierFrame;

                if (ufid == null)
                {
                    continue;
                }

                if (ufid.Owner == owner)
                {
                    return(ufid);
                }
            }

            if (!create)
            {
                return(null);
            }

            ufid = new UniqueFileIdentifierFrame(owner, null);
            tag.AddFrame(ufid);
            return(ufid);
        }
        /// <summary>
        ///    Creates a deep copy of the current instance.
        /// </summary>
        /// <returns>
        ///    A new <see cref="Frame" /> object identical to the
        ///    current instance.
        /// </returns>
        public override Frame Clone()
        {
            UniqueFileIdentifierFrame frame =
                new UniqueFileIdentifierFrame(owner);

            if (identifier != null)
            {
                frame.identifier = new ByteVector(identifier);
            }
            return(frame);
        }