@pimms.value<EOL><INDENT>def properties(_properties, tess):<DEDENT>
pp = {} if _properties is None else _properties<EOL>tp = {} if tess.properties is None else tess.properties<EOL>itbl = pimms.ITable(pimms.merge(tp, pp) if _properties is not tess.properties else pp,<EOL>n=tess.vertex_count)<EOL>return itbl.persist()<EOL>
topo.properties is the pimms Itable object of properties known to the given topology topo.