| k8s.io/apimachinery/pkg/api/validation | Package validation contains generic api type validation functions. |
| k8s.io/apimachinery/pkg/types | Package types implements various generic types used throughout kubernetes. |
| k8s.io/apimachinery/pkg/util/sets | Package sets has generic set and specified sets. |
| k8s.io/apimachinery/pkg/util/validation/field | |
| k8s.io/kubernetes/pkg/apis/core/validation | Package validation has functions for validating the correctness of api objects and explaining what is wrong with them when they aren't valid. |
| k8s.io/kubernetes/pkg/apis/resource | Package resource contains the latest (or "internal") version of the Kubernetes resource API objects. |