- import ietf-inet-types {prefix inet;}
- import ietf-yang-types {prefix yang;}
- import opendaylight-l2-types {prefix l2t;}
+ import ietf-inet-types {prefix inet; revision-date "2010-09-24";}
+ import ietf-yang-types {prefix yang; revision-date "2010-09-24";}
+ import opendaylight-l2-types {prefix l2t;revision-date "2013-08-27";}