[netmod] Backward Compatibility Question
JOEY BOYD <joey.boyd@adtran.com> Wed, 27 September 2017 14:05 UTC
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From: JOEY BOYD <joey.boyd@adtran.com>
To: "'netmod@ietf.org'" <netmod@ietf.org>
Thread-Topic: Backward Compatibility Question
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Date: Wed, 27 Sep 2017 14:05:46 +0000
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Subject: [netmod] Backward Compatibility Question
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Hi all, Suppose I had a published YANG model with the following leaf. leaf thing1 { type uint8; description "Thing 1."; } Later, I realize that I wish I had modeled this in a choice as I now have a mutually exclusive option to 'thing1' which I want to add to the model. leaf thing2 { type empty; description "Thing 2."; } This is a very simplified example but should be sufficient to demonstrate the problem. If I look at the XML representation of 'thing1', it looks like this. <thing1>123</thing1> If I were to move 'thing1' into a choice with a single case, it would look like this. choice things { case thing1 { leaf thing1 { type uint8; description "Thing 1."; } } } Looking to the XML representation, it looks the same as before. <thing1>123</thing1> To me, this means that taking a single node or set of nodes and moving them under a case within a new choice statement is a backward compatible change. This assumes, of course, any mandatory or default behavior is preserved. I now can add 'thing2' to the existing model as an option to 'thing1'. choice things { case thing1 { leaf thing1 { type uint8; description "Thing 1."; } } case thing2 { leaf thing2 { type empty; description "Thing 2."; } } } Do you agree with this analysis or am I missing something? Best regards, Joey
- Re: [netmod] Backward Compatibility Question JOEY BOYD
- Re: [netmod] Backward Compatibility Question Martin Bjorklund
- Re: [netmod] Backward Compatibility Question Andy Bierman
- Re: [netmod] Backward Compatibility Question Kent Watsen
- Re: [netmod] Backward Compatibility Question Andy Bierman
- [netmod] Backward Compatibility Question JOEY BOYD