Have you tried using libname xmlv2, you will have to define a xmlmap, but you won't have to implement a parser.
Another way:
data bob;
length
time_period $ 7
value 8
;
format value 16.12;
infile "source.xml";
input;
retain rx;
drop rx;
if _n_ = 1 then do;
rx = prxparse('/TIME_PERIOD="(.*)" OBS_VALUE="(.*)"/');
end;
if prxmatch(rx, trim(_infile_)) then do;
time_period = prxposn(rx, 1, trim(_infile_));
value = input(prxposn(rx, 2, trim(_infile_)), ?? best32.);
output;
end;
run;
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