That is nonsense, of course; but even if the users remain keenly aware that 1669 is the date only of the earliest written evidence, of what use or importance is that to them?
( ( That ( is ( ( nonsense , ) ( of course ) ) ) ) ( ; ( ( but ( even ( if ( ( the users ) ( remain ( keenly ( aware ( that ( 1669 ( is ( ( ( ( ( the date ) ( only of ) ) ( the ( earliest ( written evidence ) ) ) ) , ) ( of ( what ( ( ( use or ) importance ) ( is ( that ( to them ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ? ) ) )
(ROOT (FRAG (S (NP (DT That)) (VP (VBZ is) (NP (NP (NN nonsense)) (, ,) (PP (IN of) (NP (NN course)))))) (: ;) (FRAG (CC but) (RB even) (SBAR (IN if) (S (NP (DT the) (NNS users)) (VP (VBP remain) (ADJP (RB keenly) (JJ aware) (SBAR (IN that) (S (NP (CD 1669)) (VP (VBZ is) (NP (NP (DT the) (NN date)) (CONJP (RB only) (IN of)) (NP (DT the) (JJS earliest) (VBN written) (NN evidence)) (, ,) (PP (IN of) (SBAR (WHNP (WP what)) (S (NP (NN use) (CC or) (NN importance)) (VP (VBZ is) (NP (NP (DT that)) (PP (TO to) (NP (PRP them))))))))))))))))) (. ?)))
What value is it to the users if they know that 1669 is the date of the earliest written evidence?
( ( What value ) ( ( is ( it ( to ( ( the users ) ( if ( they ( know ( that ( 1669 ( is ( ( the date ) ( of ( the ( earliest ( written evidence ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ? ) )
(ROOT (SBARQ (WHNP (WDT What) (NN value)) (SQ (VBZ is) (NP (NP (PRP it)) (PP (TO to) (NP (NP (DT the) (NNS users)) (SBAR (IN if) (S (NP (PRP they)) (VP (VBP know) (SBAR (IN that) (S (NP (CD 1669)) (VP (VBZ is) (NP (NP (DT the) (NN date)) (PP (IN of) (NP (DT the) (JJS earliest) (JJ written) (NN evidence)))))))))))))) (. ?)))