public final boolean isTopLevelBlockFieldAccess()
        {
            if (this instanceof AccessField)
            {
                final AccessField accessField = (AccessField)this;
                return accessField.isTopLevelBlockField();
            }

            return false;
        }
Returns {@code true} if this interaction is a top-level block field access; {@code false} otherwise.
@return {@code true} if this interaction is a top-level block field access; {@code false} otherwise.
sbe-tool/src/main/java/uk/co/real_logic/sbe/generation/common/FieldPrecedenceModel.java