Apollodorus says the same thing when he states that
a question must either lie in things external,1 which give
play to conjecture, or in our own opinions: the former
he calls πραγματικός the latter περὶἐννοίας The same
is said by those who employ the terms ἀπροληπτὸς2
and προληπτικός, that is to say doubtful and presumptive, by this latter term meaning those facts which
are beyond a doubt.
An XML version of this text is available for download,
with the additional restriction that you offer Perseus any modifications you make. Perseus provides credit for all accepted
changes, storing new additions in a versioning system.