1 = YANG Tools support for YANG 1.1
2 Tony Tkacik <ttkacik@cisco.com>
4 :rfc6020: https://tools.ietf.org/html/rfc6020
5 :rfc6020bis: https://tools.ietf.org/html/draft-ietf-netmod-rfc6020bis
9 === Significant changes
11 .Summary of Changes from draft
12 - Changed the YANG version from "1" to "1.1".
13 - Made the `yang-version` statement mandatory.
14 - Made noncharacters illegal in the built-in type `string`.
15 - Defined the legal characters in YANG modules.
16 - Changed the rules for the interpretation of escaped characters in
17 double quoted strings. This is an backwards incompatible change
18 from YANG version 1. A module that uses a character sequence that
19 is now illegal must change the string to match the new rules.
20 - An unquoted string cannot contain any single or double quote
21 characters. This is an backwards incompatible change from YANG
23 - Extended the `if-feature` syntax to be a boolean expression over
25 - Allow `if-feature` in `bit`, `enum`, and `identity`.
26 - Allow `if-feature` in `refine`.
27 - Made `when` and `if-feature` illegal on list keys.
28 - Allow `choice` as a shorthand case statement.
29 - Added a new substatement `modifier` to pattern.
30 - Allow `must` in `input`, `output`, and `notification`.
31 - Allow `require-instance` in leafref.
32 - Allow `augment` to add conditionally mandatory nodes.
33 - Added a set of new XPath functions.
34 - Clarified the XPath context's tree.
35 - Defined the string value of an identityref in XPath expressions.
36 - Clarified what unprefixed names mean in leafrefs in typedefs.
37 - Allow identities to be derived from multiple base identities.
38 - Allow enumerations and bits to be subtyped.
39 - Allow leaf-lists to have default values.
40 - Allow non-unique values in non-configuration leaf-lists.
41 - Use [RFC7405] syntax for case-sensitive strings in the grammar.
42 - Changed the module advertisement mechanism.
43 - Changed the scoping rules for definitions in submodules. A
44 submodule can now reference all definitions in all submodules that
45 belong to the same module, without using the `include` statement.
46 - Added a new statement `action` that is used to define operations
48 - Allow notifications to be tied to data nodes.
49 - Added a new data definition statement `anydata`.
50 - Allow types `empty` and `leafref` in unions.
51 - Allow type `empty` in a `key`.