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It is possible to have all six combinations of relationship in object schemas. However one aspect of the impedance mismatch between object technology and relational technology is that relational technology does not support the concept of uni-directional relationships – in relational databases all associations are bi-directional (relationships are implemented via foreign keys, which can be joined/traversed in either direction).
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Up at a promontory above the river we found Olu Igbo the lord of the forest. Placing his stick in his back pocket, the little man fell silent and bowed. It was indeed an awesome sight a giant stone effigy standing among great trees, with huge eyes and long arms spread out like wings. Hoots and warbles percolated in from the foliage; rain began to fall but its drops, intercepted by the manifold layers of leaves above, hardly touched us.