code: func CanonicalParams(r *design.ResourceDefinition) []string {
  	var params []string
  	if ca := r.CanonicalAction(); ca != nil {
  		if len(ca.Routes) > 0 {
  			params = ca.Routes[0].Params()
  		}
  		for i, p := range params {
  			params[i] = Goify(p, false)
  		}
  	}
  	return params
  }
docs: // CanonicalParams returns the list of parameter names needed to build the canonical href to the
  // resource. It returns nil if the resource does not have a canonical action.