prolog check if a list is in ascending order -

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i have list , want check if ordered. can point out error?

thanks

taxinomemene([]). taxinomemene([element1,element2|tail]):-         stoixio1>stoixio12,         taxinomemene([stoixio2|tail]).

what if have singleton list , stoixio1 , stoixio12? condition should in terms of element1 , element2

is_sorted([]). is_sorted([_]). is_sorted([x,y|t]) :-    x=<y,    is_sorted([y|t]).

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