  Algebraic Ansaetze for the Poincar\'e-covariant Bethe-Salpeter wave functions
of the pion and kaon are used to calculate their light-front wave functions
(LFWFs), parton distribution amplitudes (PDAs), quasi-PDAs (qPDAs), valence
parton distribution functions (PDFs), and quasi-PDFs (qPDFs). The LFWFs are
broad, concave functions; and the scale of flavour-symmetry violation in the
kaon is roughly 15%, being set by the ratio of emergent masses in the $s$-and
$u$-quark sectors. qPDAs computed with longitudinal momentum $P_z =1.75\,$GeV
provide a semiquantitatively accurate representation of the objective PDA; but
even with $P_z=3\,$GeV, they cannot provide information about this amplitude's
endpoint behaviour. On the valence-quark domain, similar outcomes characterise
qPDFs. In this connection, however, the ratio of kaon-to-pion $u$-quark qPDFs
is found to provide a good approximation to the true PDF ratio on $0.3\lesssim
x \lesssim 0.8$, suggesting that with existing resources computations of ratios
of quasi-parton-distributions can yield results that support empirical
comparison.
