  Universal Conceptual Cognitive Annotation (UCCA; Abend and Rappoport, 2013)
is a typologically-informed, broad-coverage semantic annotation scheme that
describes coarse-grained predicate-argument structure but currently lacks
semantic roles. We argue that lexicon-free annotation of the semantic roles
marked by prepositions, as formulated by Schneider et al. (2018b), is
complementary and suitable for integration within UCCA. We show empirically for
English that the schemes, though annotated independently, are compatible and
can be combined in a single semantic graph. A comparison of several approaches
to parsing the integrated representation lays the groundwork for future
research on this task.
