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The terminology is a bit misleading (for historical reasons) - head corresponds to CAR, body to CDR and finally tag is TAG. */
publicREXPhead, body, tag;
/** cached keys (from TAG) */
String[] keys = null;
/** cached values(from CAR) */
REXP[] values = null;
/** flag denoting whether we need to re-fetch the cached values.<p><b.Note:</b> the current assumption is that the contents don't change after first retrieval - there is currently no recursive check! */
booleandirtyCache = true;
/** constructs an empty list */
publicRList() { head=body=tag=null; }
/** fake constructor to keep compatibility with Rserve (for now, will be gone soon) */