From: netmod <[email protected]> on behalf of tom petch
<[email protected]>
Sent: 24 December 2020 12:38
I have answered my own question. I had a thought as I dropped off to sleep on
December 24th, resisted the temptation to follow it up until this week and have
now seen how and where grid-type is defined. I had to look at the YANG modules
in five I-D/RFC and pursue grouping/uses nested to a depth of eight. Complex.
It reminds me of when I used to maintain system code and developed a clear
sense of code that was easy to maintain and code that was hard to maintain,
where mistakes were more likely. I would put this as beyond hard, that
tracking down 'grid-type' is a good exercise for anyone wondering how good
there YANG skills are (with a time limit of an hour:-)
Martin recently identified a flaw in one of those five I-D/RFC and while the
flaw is not germane to my challenge, yet I see the underlying complexity as a
common thread.
Tom Petch
Try again
________________________________________
From: tom petch
Sent: 24 December 2020 12:34
I wonder if you can help me with a when in a grouping; where does grid-type in
when come from below?
ccamp-wson-27 has (slightly edited)
augment "/nw:networks/nw:network/nw:node/tet:te/"
+ "tet:te-node-attributes/tet:connectivity-matrices/tet:label-restrictions/"
+ "tet:label-restriction/tet:label-step/tet:technology" {
when "../../../../../../../nw:network-types/tet:te-topology/"
+ "wson:wson-topology" {
description ...";
}
description ...";
case wson {
uses l0-types:wson-label-step;
}
}
with a tree diagram
augment /nw:networks/nw:network/nw:node/tet:te
/tet:te-node-attributes/tet:connectivity-matrices/tet:connectivity-matrix/tet:from/tet:label-restrictions
/tet:label-restriction/tet:label-step/tet:technology:
+--:(wson)
+--rw (l0-grid-type)?
+--:(dwdm)
| +--rw wson-dwdm-channel-spacing? identityref
+--:(cwdm)
+--rw wson-cwdm-channel-spacing? identityref
while l0-types has
grouping wson-label-step {
description "Label step information for WSON";
choice l0-grid-type {
description "Grid type: DWDM, CWDM, etc.";
case dwdm {
leaf wson-dwdm-channel-spacing {
when 'derived-from-or-self(../../grid-type,
"wson-grid-dwdm")'
{
description "Valid only when grid type is DWDM.";
}
type identityref {
base dwdm-ch-spc-type;
}
description ...";
reference ... ";
}
}
case cwdm {
.......
Tom Petch
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