| bytes | Package bytes implements functions for the manipulation of byte slices. |
| encoding/json | Package json implements encoding and decoding of JSON as defined in RFC 7159. |
| errors | Package errors implements functions to manipulate errors. |
| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| github.com/appc/spec/schema/types | Package types contains structs representing the various types in the app container specification. |
| go4.org/errorutil | Package errorutil helps make better error messages. |