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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: cisco.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: DM6PR11MB4708.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 13748e5c-b12f-4e29-fc95-08dbd24a4075 X-MS-Exchange-CrossTenant-originalarrivaltime: 21 Oct 2023 15:27:35.3916 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 5ae1af62-9505-4097-a69a-c1553ef7840e X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: JW8NQJ2gPcfjk1gjaEJYIWiP2OlcTDOS2WcbQ/W3P7gfbrxLu0xJNM6u11zFC9yBwIb+wyeOKPC/2xfUmkAOzg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN0PR11MB6205 X-Outbound-SMTP-Client: 173.37.147.229, alln-opgw-1.cisco.com X-Outbound-Node: alln-core-8.cisco.com Archived-At: Subject: Re: [netconf] I-D Action: draft-ietf-netconf-transaction-id-02.txt X-BeenThere: netconf@ietf.org X-Mailman-Version: 2.1.39 Precedence: list List-Id: NETCONF WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 21 Oct 2023 15:27:43 -0000 Hi Jan, WG!=0A= =0A= Thank you for a thorough and well written document.=0A= See my comments below.=0A= =0A= =0A= >From Section 4. Txid Mechanisms=0A= =0A= If a client uses more than one txid mechanism, such as both etag and=0A= last-modified in a particular message to a server, or patricular=0A= commit, the result is undefined.=0A= =0A= Wouldn't it better to define or discuss this to some extent instead of=0A= leaving it as undefined behavior? There are situations which are in=0A= the scope of this document to define.=0A= =0A= E.g., what happens if a change is reverted on the server, so the etag is=0A= different, but the last-modified is in the past from previous change?=0A= =0A= =0A= >From Section 4.1. The etag attribute txid mechanism=0A= =0A= The etag attribute values are opaque UTF-8 strings chosen freely,=0A= except that the etag string must not contain space, backslash or=0A= double quotes. The point of this restriction is to make it easy to=0A= reuse implementations that adhere to section 2.3.1 in [RFC7232].=0A= =0A= HTTP fields are generally defined to be encoded as US ASCII, so is the=0A= ETag header. See RFC 7230, where the ETag is defined to be obs-text,=0A= which is not compatible with UTF-8.=0A= =0A= Furthermore, an ETag is defined as a double quoted string in RFC 7232=0A= Section 2.3, possibly prepended by a weakness indicator.=0A= =0A= It could be good to align the etag attribute and the ETag header.=0A= =0A= =0A= >From Section 4.1. The etag attribute txid mechanism=0A= =0A= It is RECOMMENDED that the same etag txid values are used across all=0A= management interfaces (i.e. NETCONF, RESTCONF and any other the server= =0A= might implement), if it implements more than one.=0A= =0A= This suggests that the etag txid and RESTCONF ETag consider "weak" (see=0A= RFC 7232 Sections 2.3.2. Comparison and 2.3.3. Example: Entity-Tags=0A= Varying on Content-Negotiated Resources). HTTP ETags are tied to=0A= respective encoding if considered to be strong. Considering the etag=0A= txid "nc4711" this would for e.g. yang-data+xml and yang-data+json yield=0A= two different ETags e.g. "nc4711-xml" and "nc4711-json".=0A= =0A= RFC 8040 Section 3.4.1.2. Entity-Tag also states the following=0A= =0A= Note that each representation (e.g., XML vs. JSON)=0A= requires a different entity-tag.=0A= =0A= It is also a possibility to instead use "weak" ETags for RESTCONF, and=0A= then reuse the same txid value across interfaces. If the ETag is=0A= regarded as weak, it should be prefixed with "W/", i.e. the etag txid=0A= value from above would yield the ETag W/"nc4711".=0A= =0A= How the ETag is regarded has implications for match when comparing.=0A= =0A= It should at least be covered how etag and RESTCONF ETag relate.=0A= I suggest covering this and how it could be solved in an implementation,=0A= and also recommending how to solve it and what the implications are=0A= when using multiple interfaces.=0A= =0A= =0A= In Section 4.3.2. Namespaces and Attribute Placement=0A= =0A= xmlns:yp=3D"urn:ietf:params:xml:ns:yang:ietf-yang-patch" and=0A= =0A= It should say ietf-yang-push, not ietf-yang-patch.=0A= =0A= =0A= In Section 5.7. YANG-Push, the order of establish-subscription,=0A= modify-subscription, and the notification, should probably be different.=0A= Since modify-subscrition sets with-etag =3D false, but the notification=0A= returns an etag-value; which would be wrong after modify-subscription.=0A= =0A= Reordering as establish-subscription, notification, modify-subscription,=0A= would make the example correct.=0A= =0A= =0A= --=0A= Per=