Let F be a set of relational trees and let Forbh(F) be the class of all
structures that admit no homomorphism from any tree in F; all this happens over
a fixed finite relational signature σ. There is a natural way to expand
Forbh(F) by unary relations to an amalgamation class. This expanded class,
enhanced with a linear ordering, has the Ramsey property.Comment: Keywords: forbidden substructure; amalgamation; Ramsey class; partite
method v2: changed definition of expanded class; v3: final versio