1. An apparatus comprising: a path computation element (PCE) configured to: receive a type length value (TLV) that describes properties, structure, and characteristics of a resource pool of a wavelength switched optical network (WSON) node; and perform a routing a and wavelength assignment (RWA) process via the WSON node, wherein the TLV comprises an action field, a reserved field, a length field, and a plurality of resource identifier fields.