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<!DOCTYPE html>
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<title>A YANG Data Model for Interface Reference Topology</title>
<meta content="Jonas Ahlberg" name="author">
<meta content="Scott Mansfield" name="author">
<meta content="Min Ye" name="author">
<meta content="Italo Busi" name="author">
<meta content="Xi Li" name="author">
<meta content="Daniela Spreafico" name="author">
<meta content="
This document defines a YANG data model to provide a reference from a termination point in a topology model to interface management information.
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}
/* font-family isn't space-separated, but =~ will have to do */
svg[font-family~="monospace" i], svg [font-family~="monospace" i] {
font-family: var(--font-mono);
}
.alignCenter.art-text {
background-color: var(--highlight-color);
border: 1px solid var(--line-color);
border-radius: 3px;
padding: 0.5em 1em 0;
margin-bottom: 0.5em;
}
.alignCenter.art-text pre {
padding: 0;
width: auto;
}
.alignCenter {
margin: 1em 0;
}
.alignCenter > *:first-child {
border: none;
/* this isn't optimal, but it's an existence proof. PrinceXML doesn't
support flexbox yet.
*/
display: table;
margin: 0 auto;
}
/* lists */
ol, ul {
padding: 0;
margin: 0 0 0.5em 2em;
}
:is(ol, ul) :is(ol, ul) {
margin-left: 1em;
}
li {
margin: 0 0 0.25em 0;
}
.ulCompact li {
margin: 0;
}
ul.empty, .ulEmpty {
list-style-type: none;
}
ul.empty li, .ulEmpty li {
margin-top: 0.5em;
}
:is(ul, ol).compact, .ulCompact, .olCompact {
line-height: 100%;
margin: 0 0 0 2em;
}
/* definition lists */
dl {
clear: left;
--indent: 3ch;
/* --indent: attr(indent ch); not supported in any browser, but we can dream */
}
dl > dt {
float: left;
margin-right: 1em;
min-width: 12ch;
}
dl.dlNewline > dt {
float: none;
}
dl > dd {
margin-bottom: .8em;
margin-left: var(--indent) !important; /* stupid element overrides */
min-height: 2ex;
}
:is(dl.compact, .dlCompact) > dd {
margin-bottom: 0;
}
:is(dl.compact, .dlCompact) > dd > :is(:first-child, .break:first-child + *) {
margin-top: 0;
}
:is(dl.compact, .dlCompact) > dd > :is(:last-child) {
margin-bottom: 0;
}
dl > dd > dl {
margin-top: 0.5em;
margin-bottom: 0;
}
dl .break {
display: none;
}
/* links */
a, a[href].selfRef:hover {
text-decoration: none;
}
a[href].selfRef {
color: var(--text-color);
}
a[href] {
color: var(--link-color);
}
a[href]:hover {
text-decoration: underline;
}
a[href].selfRef:hover {
background-color: var(--highlight-color);
}
a.xref {
white-space: nowrap;
}
/* Figures */
tt, code, pre {
background-color: var(--highlight-color);
font: 14px/22px var(--font-mono);
}
tt, code {
/* changing the font for inline elements leads to different ascender
and descender heights; as we want to retain baseline alignment,
remove leading to avoid altering the final height of lines */
line-height: 0;
}
:is(h1, h2, h3, h4, h5, h6) :is(tt, code) {
font-size: 84%;
}
pre {
border: 1px solid var(--line-color);
font-size: 13.5px;
line-height: 16px;
letter-spacing: -0.2px;
margin: 5px;
padding: 5px;
}
img {
max-width: 100%;
}
figure {
margin: 0.5em 0;
padding: 0;
}
figure blockquote {
margin: 0.8em 0.4em 0.4em;
}
figcaption, caption {
font-style: italic;
margin: 0.5em 1.5em;
text-align: left;
}
@media screen {
/* Auto-collapse boilerplate. */
:is(#status-of-memo, #copyright) p {
margin: -2px 0;
max-height: 0;
transition: max-height 2s ease, margin 0.5s ease 0.5s;
overflow: hidden;
}
:is(#status-of-memo, #copyright):hover p,
:is(#status-of-memo, #copyright) h2:target ~ p {
margin: 0.5em 0;
max-height: 500px;
overflow: auto;
}
pre, svg {
display: inline-block;
overflow-x: auto;
}
pre {
max-width: 100%;
width: calc(100% - 22px - 1em);
}
svg {
max-width: calc(100% - 22px - 1em);
}
figure pre {
display: block;
width: calc(100% - 25px);
}
:is(pre, svg) + .pilcrow {
display: inline-block;
vertical-align: text-bottom;
padding-bottom: 8px;
}
}
/* aside, blockquote */
aside, blockquote {
margin-left: 0;
padding: 0 2em;
font-style: italic;
}
blockquote {
margin: 1em 0;
}
cite {
display: block;
text-align: right;
font-style: italic;
}
/* tables */
table {
max-width: 100%;
margin: 0 0 1em;
border-collapse: collapse;
}
table.right {
margin-left: auto;
}
table.center {
margin-left: auto;
margin-right: auto;
}
table.left {
margin-right: auto;
}
thead, tbody {
border: 1px solid var(--line-color);
}
th, td {
text-align: left;
vertical-align: top;
padding: 5px 10px;
}
th {
background-color: var(--line-color);
}
:is(tr:nth-child(2n), thead+tbody > tr:nth-child(2n+1)) > td {
background-color: var(--background-color);
}
:is(tr:nth-child(2n+1), thead+tbody > tr:nth-child(2n)) > td {
background-color: var(--highlight-color);
}
table caption {
margin: 0;
padding: 3px 0 3px 1em;
}
table p {
margin: 0;
}
/* pilcrow */
a.pilcrow {
margin-left: 3px;
opacity: 0.2;
user-select: none;
}
a.pilcrow[href] { color: var(--pilcrow-weak); }
a.pilcrow[href]:hover { text-decoration: none; }
@media not print {
:hover > a.pilcrow {
opacity: 1;
}
a.pilcrow[href]:hover {
color: var(--pilcrow-strong);
background-color: transparent;
}
}
@media print {
a.pilcrow {
display: none;
}
}
/* misc */
hr {
border: 0;
border-top: 1px solid var(--line-color);
}
.bcp14 {
font-variant: small-caps;
font-weight: 600;
font-size: 14.5px;
}
.role {
font-variant: all-small-caps;
}
/* info block */
#identifiers {
margin: 0;
font-size: var(--small-font-size);
line-height: 18px;
--identifier-width: 15ch;
}
#identifiers dt {
width: var(--identifier-width);
min-width: var(--identifier-width);
clear: left;
float: left;
text-align: right;
}
#identifiers dd {
margin: 0;
margin-left: calc(1em + var(--identifier-width)) !important;
min-width: 5em;
}
#identifiers .authors .author {
display: inline-block;
margin-right: 1.5em;
}
#identifiers .authors .org {
font-style: italic;
}
/* The prepared/rendered info at the very bottom of the page */
.docInfo {
color: #999;
font-size: 0.9em;
font-style: italic;
margin-top: 2em;
}
.docInfo .prepared {
float: left;
}
.docInfo .prepared {
float: right;
}
/* table of contents */
#toc {
padding: 0.75em 0 2em 0;
margin-bottom: 1em;
}
#toc nav ul {
margin: 0 0.5em 0 0;
padding: 0;
list-style: none;
}
#toc nav li {
line-height: 1.3em;
margin: 0.75em 0;
padding-left: 1.2em;
text-indent: -1.2em;
}
#toc a.xref {
white-space: normal;
}
/* references */
.references dt {
text-align: right;
font-weight: bold;
min-width: 7em;
}
.references dt:target::before {
content: "⇒";
width: 15px;
margin: 0 10px 0 -25px;
}
.references dd {
margin-left: 8em !important;
overflow: auto;
}
.refInstance {
margin-bottom: 1.25em;
}
.references .ascii {
margin-bottom: 0.25em;
}
/* index */
#rfc\.index\.index + ul {
margin-left: 0;
}
/* authors */
address.vcard {
font-style: normal;
margin: 1em 0;
}
address.vcard .nameRole {
font-weight: 700;
margin-left: 0;
}
address.vcard .label {
margin: 0.5em 0;
}
address.vcard .type {
display: none;
}
.alternative-contact {
margin: 1.5em 0 1em;
}
hr.addr {
border-top: 1px dashed;
margin: 0;
color: #ddd;
max-width: calc(100% - 16px);
}
@media (min-width: 500px) {
#authors-addresses > section {
column-count: 2;
column-gap: 20px;
}
#authors-addresses > section > h2 {
column-span: all;
}
/* hack for break-inside: avoid-column */
#authors-addresses address {
display: inline-block;
break-inside: avoid-column;
}
}
.rfcEditorRemove p:first-of-type {
font-style: italic;
}
.cref {
background-color: rgba(249, 232, 105, 0.3);
padding: 2px 4px;
}
.crefSource {
font-style: italic;
}
/* alternative layout for smaller screens */
@media screen and (max-width: 929px) {
#toc {
position: fixed;
z-index: 2;
top: 0;
right: 0;
padding: 0;
margin: 0;
border-bottom: 1px solid #ccc;
opacity: 0.6;
}
#toc.active {
opacity: 1;
}
#toc h2 {
margin: 0;
padding: 2px 0 2px 6px;
padding-right: 1em;
font-size: 18px;
line-height: 24px;
min-width: 190px;
text-align: right;
background-color: #444;
color: white;
cursor: pointer;
}
#toc h2::before { /* css hamburger */
float: right;
position: relative;
width: 1em;
height: 1px;
left: -164px;
margin: 8px 0 0 0;
background: white none repeat scroll 0 0;
box-shadow: 0 4px 0 0 white, 0 8px 0 0 white;
content: "";
}
#toc nav {
display: none;
background-color: var(--background-color);
padding: 0.5em 1em 1em;
overflow: auto;
overscroll-behavior: contain;
height: calc(100vh - 48px);
border-left: 1px solid #ddd;
}
#toc.active nav {
display: block;
}
/* Make the collapsed ToC header render white on gray also when it's a link */
#toc h2 a,
#toc h2 a:link,
#toc h2 a:focus,
#toc h2 a:hover,
#toc a.toplink,
#toc a.toplink:hover {
color: white;
background-color: #444;
text-decoration: none;
}
#toc a.toplink {
margin-top: 2px;
}
}
/* alternative layout for wide screens */
@media screen and (min-width: 930px) {
body {
padding-right: 360px;
padding-right: calc(min(180px + 20%, 500px));
}
#toc {
position: fixed;
bottom: 0;
right: 0;
right: calc(50vw - 480px);
width: 312px;
margin: 0;
padding: 0;
z-index: 1;
}
#toc h2 {
margin: 0;
padding: 0.25em 1em 1em 0;
}
#toc nav {
display: block;
height: calc(90vh - 84px);
bottom: 0;
padding: 0.5em 0 2em;
overflow: auto;
overscroll-behavior: contain;
scrollbar-width: thin;
}
#toc nav > ul {
margin-bottom: 2em;
}
#toc ul {
margin: 0 0 0 4px;
font-size: var(--small-font-size);
}
#toc ul :is(p, li) {
margin: 2px 0;
line-height: 22px;
}
img { /* future proofing */
max-width: 100%;
height: auto;
}
}
/* pagination */
@media print {
body {
width: 100%;
}
p {
orphans: 3;
widows: 3;
}
#n-copyright-notice {
border-bottom: none;
}
#toc, #n-introduction {
page-break-before: always;
}
#toc {
border-top: none;
padding-top: 0;
}
figure, pre {
page-break-inside: avoid;
}
figure {
overflow: scroll;
}
h1, h2, h3, h4, h5, h6 {
page-break-after: avoid;
}
h2+*, h3+*, h4+*, h5+*, h6+* {
page-break-before: avoid;
}
pre {
white-space: pre-wrap;
word-wrap: break-word;
font-size: 10pt;
}
table {
border: 1px solid #ddd;
}
td {
border-top: 1px solid #ddd;
}
}
@page :first {
padding-top: 0;
@top-left {
content: normal;
border: none;
}
@top-center {
content: normal;
border: none;
}
@top-right {
content: normal;
border: none;
}
}
@page {
size: A4;
margin-bottom: 45mm;
padding-top: 20px;
}
/* Changes introduced to fix issues found during implementation */
/* Separate body from document info even without intervening H1 */
section {
clear: both;
}
/* Top align author divs, to avoid names without organization dropping level with org names */
.author {
vertical-align: top;
}
/* Style section numbers with more space between number and title */
.section-number {
padding-right: 0.5em;
}
/* Add styling for a link in the ToC that points to the top of the document */
a.toplink {
float: right;
margin: 8px 0.5em 0;
}
/* Provide styling for table cell text alignment */
table .text-left {
text-align: left;
}
table .text-center {
text-align: center;
}
table .text-right {
text-align: right;
}
/* Make the alternative author contact information look less like just another
author, and group it closer with the primary author contact information */
.alternative-contact {
margin: 0.5em 0 0.25em 0;
}
address .non-ascii {
margin: 0 0 0 2em;
}
/* With it being possible to set tables with alignment
left, center, and right, { width: 100%; } does not make sense */
table {
width: auto;
}
/* Avoid reference text that sits in a block with very wide left margin,
because of a long floating dt label.*/
.references dd {
overflow: visible;
}
/* Control caption placement */
caption {
caption-side: bottom;
}
/* Limit the width of the author address vcard, so names in right-to-left
script don't end up on the other side of the page. */
address.vcard {
max-width: 20em;
margin-right: auto;
}
/* For address alignment dependent on LTR or RTL scripts */
address div.left {
text-align: left;
}
address div.right {
text-align: right;
}
/* Give the table caption label the same styling as the figcaption */
@media print {
.toplink {
display: none;
}
/* avoid overwriting the top border line with the ToC header */
#toc {
padding-top: 1px;
}
/* Avoid page breaks inside dl and author address entries */
dd {
page-break-before: avoid;
}