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Published online by Cambridge University Press: 20 November 2018
We introduce two Ramsey classes of finite relational structures. The first class contains finite structures of the form $\left( A,\,\left( {{I}_{i}} \right)_{i=1}^{n},\le ,\left( {{\underline{\prec }}_{i}} \right)_{i=1}^{n} \right)$, where
$\le$ is a total ordering on
$A$ and
${{\underline{\prec }}_{i}}$ is a linear ordering on the set
$\left\{ a\,\in \,A\,:\,{{I}_{i}}\left( a \right) \right\}$. The second class contains structures of the form a
$\left( a,\le ,\left( {{i}_{i}} \right)_{i=1}^{n},\underline{\prec } \right)$, where
$\left( A,\,\le \right)$ is a weak ordering and
$\underline{\prec }$ is a linear ordering on
$A$ such that
$A$ is partitioned by
$\left\{ a\,\in \,A\,:\,{{I}_{i}}\left( a \right) \right\}$ into maximal chains in the partial ordering
$\le$ and each
$\left\{ a\,\in \,A\,:\,{{I}_{i}}\left( a \right) \right\}$ is an interval with respect to
$\underline{\prec }$.