int SetElValueLengthByNumber(guint32 l, guint32 group, guint32 element);
int SetElValueLengthByName (guint32 l, string TagName);
int SetElValueLengthByNumber(guint32 l, guint32 group, guint32 element);
int SetElValueLengthByName (guint32 l, string TagName);