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notes about how rdfdb syncs, or should sync
author drewp@bigasterisk.com
date Mon, 03 Jun 2024 23:01:54 -0700
parents 4bab5bbce195
children
files doc/graph-sharing.svg
diffstat 1 files changed, 782 insertions(+), 0 deletions(-) [+]
line wrap: on
line diff
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/doc/graph-sharing.svg	Mon Jun 03 23:01:54 2024 -0700
@@ -0,0 +1,782 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
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+   height="210mm"
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+   id="svg1"
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+    <text
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+         sodipodi:role="line"
+         x="602.47052"
+         y="269.60541"
+         id="tspan8"
+         style="stroke-width:1.42857px">← graph changed</tspan><tspan
+         sodipodi:role="line"
+         x="602.47052"
+         y="290.69962"
+         id="tspan67"
+         style="stroke-width:1.42857px">- deletes</tspan><tspan
+         sodipodi:role="line"
+         x="602.47052"
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+         id="tspan68"
+         style="stroke-width:1.42857px">- adds</tspan><tspan
+         sodipodi:role="line"
+         x="602.47052"
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+         id="tspan69"
+         style="stroke-width:1.42857px">- fromVersion (0 for resync)</tspan><tspan
+         sodipodi:role="line"
+         x="602.47052"
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+         id="tspan70"
+         style="stroke-width:1.42857px">- toVersion</tspan><tspan
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+         x="602.47052"
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+         style="stroke-width:1.42857px"></tspan><tspan
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+    <text
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+       style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:16px;line-height:125%;font-family:'Ubuntu Condensed';-inkscape-font-specification:'Ubuntu Condensed, Normal';font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;font-feature-settings:normal;font-variation-settings:normal;text-indent:0;text-align:start;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:0px;word-spacing:0px;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:normal;shape-padding:0;shape-margin:0;inline-size:0;opacity:1;vector-effect:none;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.999999px;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;-inkscape-stroke:none;stop-color:#000000;stop-opacity:1"
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+         sodipodi:role="line"
+         id="tspan14"
+         x="603.27051"
+         y="236.53676">⇄ 2024 protocol (avro)</tspan></text>
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+   style="font-weight:bold"
+   id="tspan11">graph.patch(p)</tspan>
+</tspan><tspan
+         x="152.07195"
+         y="263.67955"
+         id="tspan13">immediately patches local side, </tspan><tspan
+         x="152.07195"
+         y="283.67955"
+         id="tspan16">storing the accumulated patch </tspan><tspan
+         x="152.07195"
+         y="303.67955"
+         id="tspan17">from the last known graph version
+</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:16px;line-height:125%;font-family:'Ubuntu Condensed';-inkscape-font-specification:'Ubuntu Condensed, Normal';font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;font-feature-settings:normal;font-variation-settings:normal;text-indent:0;text-align:start;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:0px;word-spacing:0px;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:normal;shape-padding:0;shape-margin:0;inline-size:0;opacity:1;vector-effect:none;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1.42857px;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;-inkscape-stroke:none;stop-color:#000000;stop-opacity:1"
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+         style="font-weight:normal;stroke-width:1.42857px">→ graph edit</tspan><tspan
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+       xml:space="preserve"
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+         x="152.31226"
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+   style="font-weight:bold"
+   id="tspan18">graph.sync()</tspan>
+</tspan><tspan
+         x="152.31226"
+         y="404.69039"
+         id="tspan21">&quot;send our diffs, and make our local </tspan><tspan
+         x="152.31226"
+         y="424.69039"
+         id="tspan25">graph match the rdfdb one&quot;
+</tspan><tspan
+         x="152.31226"
+         y="444.69039"
+         id="tspan26">Called after patch, reconnect, etc.</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:16px;line-height:125%;font-family:'Ubuntu Condensed';-inkscape-font-specification:'Ubuntu Condensed, Normal';font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;font-feature-settings:normal;font-variation-settings:normal;text-indent:0;text-align:start;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:0px;word-spacing:0px;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:pre;shape-padding:0;shape-margin:0;inline-size:216.94;display:inline;opacity:1;vector-effect:none;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.999999px;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;-inkscape-stroke:none;stop-color:#000000;stop-opacity:1"
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+         id="tspan27">stores and syncs with disk:
+</tspan><tspan
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+         id="tspan28">- stmts
+</tspan><tspan
+         x="953.84619"
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+         id="tspan34">- graphVersion
+</tspan><tspan
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+</tspan><tspan
+         x="953.84619"
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+         id="tspan36">and optionally some recent </tspan><tspan
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+         id="tspan37">versions that clients might </tspan><tspan
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+         y="377.44539"
+         id="tspan39">refererence in their edits, to </tspan><tspan
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+    <text
+       xml:space="preserve"
+       style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:16px;line-height:125%;font-family:'Ubuntu Condensed';-inkscape-font-specification:'Ubuntu Condensed, Normal';font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;font-feature-settings:normal;font-variation-settings:normal;text-indent:0;text-align:start;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:0px;word-spacing:0px;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:normal;shape-padding:0;shape-margin:0;inline-size:0;opacity:1;vector-effect:none;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.999999px;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;-inkscape-stroke:none;stop-color:#000000;stop-opacity:1"
+       x="56.231335"
+       y="124.78235"
+       id="text39"
+       transform="matrix(0.26458333,0,0,0.26458333,0.62751132,-8.3208524)"><tspan
+         sodipodi:role="line"
+         x="56.231335"
+         y="124.78235"
+         id="tspan40">one window-scoped <tspan
+   style="font-weight:bold"
+   id="tspan41">SyncedGraph</tspan> object</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:16px;line-height:125%;font-family:'Ubuntu Condensed';-inkscape-font-specification:'Ubuntu Condensed, Normal';font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;font-feature-settings:normal;font-variation-settings:normal;text-indent:0;text-align:start;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:0px;word-spacing:0px;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:normal;shape-padding:0;shape-margin:0;inline-size:0;opacity:1;vector-effect:none;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.999999px;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;-inkscape-stroke:none;stop-color:#000000;stop-opacity:1"
+       x="96.823036"
+       y="371.12299"
+       id="text43"
+       transform="matrix(0.26458333,0,0,0.26458333,-0.13784353,4.690379)"><tspan
+         sodipodi:role="line"
+         id="tspan43"
+         x="96.823036"
+         y="371.12299"
+         style="font-weight:bold">graph.onVersionChanged</tspan><tspan
+         sodipodi:role="line"
+         x="96.823036"
+         y="391.12299"
+         id="tspan44">if we are based on the fromVersion</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:16px;line-height:125%;font-family:'Ubuntu Condensed';-inkscape-font-specification:'Ubuntu Condensed, Normal';font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;font-feature-settings:normal;font-variation-settings:normal;text-indent:0;text-align:start;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:0px;word-spacing:0px;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:pre;shape-padding:0;shape-margin:0;inline-size:295.932;display:inline;opacity:1;vector-effect:none;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.999999px;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;-inkscape-stroke:none;stop-color:#000000;stop-opacity:1"
+       x="397.33862"
+       y="164.25574"
+       id="text45"
+       transform="matrix(0.26458333,0,0,0.26458333,-80.046609,-7.2652108)"><tspan
+         x="397.33862"
+         y="164.25574"
+         id="tspan45">Internally, the graph is stored as 
+</tspan><tspan
+         x="397.33862"
+         y="184.25574"
+         id="tspan47">- a local patch on top of 
+</tspan><tspan
+         x="397.33862"
+         y="204.25574"
+         id="tspan48">- an rdfdb graph @ graphVersion</tspan></text>
+    <rect
+       style="color:#000000;overflow:visible;fill:none;stroke:#69dd65;stroke-width:0.264583;stroke-miterlimit:10;-inkscape-stroke:none"
+       id="rect48"
+       width="105"
+       height="155"
+       x="10"
+       y="10" />
+    <rect
+       style="color:#000000;overflow:visible;fill:none;stroke:#69dd65;stroke-width:0.264583;stroke-miterlimit:10;-inkscape-stroke:none"
+       id="rect49"
+       width="96.380028"
+       height="94.064072"
+       x="13.852575"
+       y="20.427954" />
+    <rect
+       style="color:#000000;overflow:visible;fill:none;stroke:#69dd65;stroke-width:0.264583;stroke-miterlimit:10;-inkscape-stroke:none"
+       id="rect51"
+       width="90"
+       height="154.86771"
+       x="200"
+       y="10.000004" />
+    <g
+       id="g54"
+       style="opacity:0.52671"
+       transform="translate(-0.15943759,-4.0259874)">
+      <text
+         xml:space="preserve"
+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:16px;line-height:125%;font-family:'Ubuntu Condensed';-inkscape-font-specification:'Ubuntu Condensed, Normal';font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;font-feature-settings:normal;font-variation-settings:normal;text-indent:0;text-align:start;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:0px;word-spacing:0px;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:normal;shape-padding:0;shape-margin:0;inline-size:0;opacity:1;vector-effect:none;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.999999px;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;-inkscape-stroke:none;stop-color:#000000;stop-opacity:1"
+         x="760.51025"
+         y="269.38141"
+         id="text22"
+         transform="matrix(0.26458333,0,0,0.26458333,8.6969751,-41.48589)"><tspan
+           sodipodi:role="line"
+           id="tspan22"
+           x="760.51025"
+           y="269.38141">ws:/syncedGraph (legacy)</tspan></text>
+      <text
+         xml:space="preserve"
+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:16px;line-height:125%;font-family:'Ubuntu Condensed';-inkscape-font-specification:'Ubuntu Condensed, Normal';font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;font-feature-settings:normal;font-variation-settings:normal;text-indent:0;text-align:start;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:0px;word-spacing:0px;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:normal;shape-padding:0;shape-margin:0;inline-size:0;opacity:1;vector-effect:none;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1.26828px;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;-inkscape-stroke:none;stop-color:#000000;stop-opacity:1"
+         x="824.49902"
+         y="132.28346"
+         id="text51"
+         transform="matrix(0.20861605,0,0,0.20861605,46.186158,6.7185059)"><tspan
+           sodipodi:role="line"
+           id="tspan51"
+           x="824.49902"
+           y="132.28346"
+           style="stroke-width:1.26828px">sends full graph at startup,</tspan><tspan
+           sodipodi:role="line"
+           x="824.49902"
+           y="152.28346"
+           id="tspan52"
+           style="stroke-width:1.26828px">accepts patches,</tspan><tspan
+           sodipodi:role="line"
+           x="824.49902"
+           y="172.28346"
+           id="tspan53"
+           style="stroke-width:1.26828px">broadcasts them to other clients,</tspan><tspan
+           sodipodi:role="line"
+           x="824.49902"
+           y="192.28346"
+           id="tspan54"
+           style="stroke-width:1.26828px">disconnects on detected conflicts</tspan></text>
+    </g>
+    <text
+       xml:space="preserve"
+       style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:16px;line-height:125%;font-family:'Ubuntu Condensed';-inkscape-font-specification:'Ubuntu Condensed, Normal';font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;font-feature-settings:normal;font-variation-settings:normal;text-indent:0;text-align:start;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:0px;word-spacing:0px;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:normal;shape-padding:0;shape-margin:0;inline-size:0;opacity:1;vector-effect:none;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.999999px;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;-inkscape-stroke:none;stop-color:#000000;stop-opacity:1"
+       x="534.40503"
+       y="116.42434"
+       id="text56"
+       transform="matrix(0.26458333,0,0,0.26458333,-13.265116,-9.2753199)"><tspan
+         sodipodi:role="line"
+         id="tspan56"
+         x="534.40503"
+         y="116.42434">⇄ patches protocol (JSON)</tspan><tspan
+         sodipodi:role="line"
+         x="534.40503"
+         y="137.51854"
+         id="tspan57" /></text>
+    <path
+       id="rect50"
+       style="overflow:visible;fill:none;stroke:#69dd65;stroke-width:0.264583;stroke-miterlimit:10"
+       d="m 13.852575,114.49203 h 96.512315 v 29.77958 H 13.852575 Z" />
+    <text
+       xml:space="preserve"
+       style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:16px;line-height:125%;font-family:'Ubuntu Condensed';-inkscape-font-specification:'Ubuntu Condensed, Normal';font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;font-feature-settings:normal;font-variation-settings:normal;text-indent:0;text-align:start;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:0px;word-spacing:0px;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:normal;shape-padding:0;shape-margin:0;inline-size:0;opacity:1;vector-effect:none;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1.02899px;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;-inkscape-stroke:none;stop-color:#000000;stop-opacity:1"
+       x="520.00647"
+       y="172.40318"
+       id="text58"
+       transform="matrix(0.24988407,0,0,0.26458333,-8.1107096,15.663921)"><tspan
+         sodipodi:role="line"
+         id="tspan58"
+         x="520.00647"
+         y="172.40318"
+         style="stroke-width:1.02899px">⇄ sub/unsub protocol (db_protocol.ts)</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:16px;line-height:125%;font-family:'Ubuntu Condensed';-inkscape-font-specification:'Ubuntu Condensed, Normal';font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;font-feature-settings:normal;font-variation-settings:normal;text-indent:0;text-align:start;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:0px;word-spacing:0px;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:pre;shape-padding:0;shape-margin:0;inline-size:322.214;display:inline;opacity:1;vector-effect:none;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1.42857px;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;-inkscape-stroke:none;stop-color:#000000;stop-opacity:1"
+       x="556.1756"
+       y="142.16052"
+       id="text59"
+       transform="matrix(0.18520833,0,0,0.18520833,30.33272,1.7625738)"><tspan
+         x="556.1756"
+         y="142.16052"
+         id="tspan49">← patch
+</tspan><tspan
+         x="556.1756"
+         y="163.25472"
+         id="tspan50">(1st few patches contain the whole graph)
+</tspan><tspan
+         x="556.1756"
+         y="183.25472"
+         id="tspan55">
+</tspan><tspan
+         x="556.1756"
+         y="203.25472"
+         id="tspan60">→ patch
+</tspan><tspan
+         x="556.1756"
+         y="224.34891"
+         id="tspan61">
+</tspan><tspan
+         x="556.1756"
+         y="244.34891"
+         id="tspan62">Upon conflict, server disconnects
+</tspan></text>
+    <rect
+       style="color:#000000;overflow:visible;opacity:0.52671;fill:none;stroke:#ad9a36;stroke-width:0.264583;stroke-miterlimit:10;stroke-opacity:1;-inkscape-stroke:none"
+       id="rect63"
+       width="74.620178"
+       height="35.178116"
+       x="120.24753"
+       y="15.387728" />
+    <text
+       xml:space="preserve"
+       style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:16px;line-height:125%;font-family:'Ubuntu Condensed';-inkscape-font-specification:'Ubuntu Condensed, Normal';font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;font-feature-settings:normal;font-variation-settings:normal;text-indent:0;text-align:start;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:0px;word-spacing:0px;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:pre;shape-padding:0;shape-margin:0;inline-size:323.339;display:inline;opacity:1;vector-effect:none;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1.42857px;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;-inkscape-stroke:none;stop-color:#000000;stop-opacity:1"
+       x="526.0542"
+       y="267.52496"
+       id="text64"
+       transform="matrix(0.18520833,0,0,0.18520833,30.885799,17.658265)"><tspan
+         x="526.0542"
+         y="267.52496"
+         id="tspan63">Not implemented
+</tspan><tspan
+         x="526.0542"
+         y="287.52498"
+         id="tspan66">
+</tspan><tspan
+         x="526.0542"
+         y="307.52498"
+         id="tspan76">clients sub and unsub from stmt patterns; </tspan><tspan
+         x="526.0542"
+         y="327.52498"
+         id="tspan78">server sends sub events</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:16px;line-height:125%;font-family:'Ubuntu Condensed';-inkscape-font-specification:'Ubuntu Condensed, Normal';font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;font-feature-settings:normal;font-variation-settings:normal;text-indent:0;text-align:start;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:0px;word-spacing:0px;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:normal;shape-padding:0;shape-margin:0;inline-size:0;opacity:1;vector-effect:none;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.999999px;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;-inkscape-stroke:none;stop-color:#000000;stop-opacity:1"
+       x="543.12921"
+       y="37.295277"
+       id="text65"
+       transform="scale(0.26458333)"><tspan
+         sodipodi:role="line"
+         id="tspan65"></tspan></text>
+    <rect
+       style="color:#000000;overflow:visible;opacity:0.52671;fill:none;stroke:#ad9a36;stroke-width:0.264583;stroke-miterlimit:10;stroke-opacity:1;-inkscape-stroke:none"
+       id="rect75"
+       width="74.88475"
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+    <text
+       xml:space="preserve"
+       style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:16px;line-height:125%;font-family:'Ubuntu Condensed';-inkscape-font-specification:'Ubuntu Condensed, Normal';font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;font-feature-settings:normal;font-variation-settings:normal;text-indent:0;text-align:start;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:0px;word-spacing:0px;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:pre;shape-padding:0;shape-margin:0;inline-size:296.357;display:inline;opacity:1;vector-effect:none;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.999999px;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;-inkscape-stroke:none;stop-color:#000000;stop-opacity:1"
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+       id="text77"
+       transform="scale(0.26458333)"><tspan
+         x="100.49341"
+         y="581.46527"
+         id="tspan79">other &lt;graph&gt; elements share the </tspan><tspan
+         x="100.49341"
+         y="601.46529"
+         id="tspan83">same state</tspan></text>
+    <path
+       style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:0.264583px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
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+       style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:16px;line-height:125%;font-family:'Ubuntu Condensed';-inkscape-font-specification:'Ubuntu Condensed, Normal';font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;font-feature-settings:normal;font-variation-settings:normal;text-indent:0;text-align:start;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:0px;word-spacing:0px;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:normal;shape-padding:0;shape-margin:0;inline-size:0;opacity:1;vector-effect:none;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1.42857px;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;-inkscape-stroke:none;stop-color:#000000;stop-opacity:1"
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+         sodipodi:role="line"
+         id="tspan80"
+         x="188.9763"
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+         style="stroke-width:1.42857px">edit(from=v1,-stmt1,+stmt2, to=proposedVx)</tspan></text>
+    <text
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+    <text
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+      <text
+         xml:space="preserve"
+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:16px;line-height:125%;font-family:'Ubuntu Condensed';-inkscape-font-specification:'Ubuntu Condensed, Normal';font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;font-feature-settings:normal;font-variation-settings:normal;text-indent:0;text-align:start;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:0px;word-spacing:0px;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:normal;shape-padding:0;shape-margin:0;inline-size:0;opacity:1;vector-effect:none;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1.42857px;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;-inkscape-stroke:none;stop-color:#000000;stop-opacity:1"
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+           style="stroke-width:1.42857px">v4</tspan></text>
+    </g>
+    <text
+       xml:space="preserve"
+       style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:16px;line-height:125%;font-family:'Ubuntu Condensed';-inkscape-font-specification:'Ubuntu Condensed, Normal';font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;font-feature-settings:normal;font-variation-settings:normal;text-indent:0;text-align:start;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:0px;word-spacing:0px;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:normal;shape-padding:0;shape-margin:0;inline-size:0;opacity:1;vector-effect:none;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1.42857px;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;-inkscape-stroke:none;stop-color:#000000;stop-opacity:1"
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+         style="stroke-width:1.42857px">clientC1</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:16px;line-height:125%;font-family:'Ubuntu Condensed';-inkscape-font-specification:'Ubuntu Condensed, Normal';font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;font-feature-settings:normal;font-variation-settings:normal;text-indent:0;text-align:start;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:0px;word-spacing:0px;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:normal;shape-padding:0;shape-margin:0;inline-size:0;opacity:1;vector-effect:none;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1.42857px;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;-inkscape-stroke:none;stop-color:#000000;stop-opacity:1"
+       x="185.27213"
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+         style="stroke-width:1.42857px">clientC2</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:10.6667px;line-height:125%;font-family:'Ubuntu Condensed';-inkscape-font-specification:'Ubuntu Condensed, Normal';font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;text-indent:0;text-align:start;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:0px;word-spacing:0px;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:pre;shape-padding:0;shape-margin:0;inline-size:129.92;opacity:1;vector-effect:none;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.999999px;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;-inkscape-stroke:none;stop-color:#000000;stop-opacity:1"
+       x="324.78027"
+       y="748.12115"
+       id="text96"
+       transform="matrix(0.26458333,0,0,0.26458333,1.5197378,-5.0294909)"><tspan
+         x="324.78027"
+         y="748.12115"
+         id="tspan84">err, C2 needs to be </tspan><tspan
+         x="324.78027"
+         y="761.45451"
+         id="tspan85">brought up to date with </tspan><tspan
+         x="324.78027"
+         y="774.78789"
+         id="tspan86">v2 then it can retry. C2 </tspan><tspan
+         x="324.78027"
+         y="788.12126"
+         id="tspan93">keeps its local patch for </tspan><tspan
+         x="324.78027"
+         y="801.45463"
+         id="tspan94">now</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:12px;line-height:125%;font-family:Sans;-inkscape-font-specification:'Sans, Normal';font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;text-indent:0;text-align:start;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:0px;word-spacing:0px;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:pre;shape-padding:0;shape-margin:0;inline-size:269.044;opacity:1;vector-effect:none;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.999999px;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;-inkscape-stroke:none;stop-color:#000000;stop-opacity:1"
+       x="487.1438"
+       y="713.83099"
+       id="text100"
+       transform="matrix(0.26458333,0,0,0.26458333,-8.7679639,-7.4319712)"><tspan
+         x="487.1438"
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+         id="tspan95">changed(..., from=v1, to=v2, aka 'proposedVx')</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:10.6667px;line-height:125%;font-family:'Ubuntu Condensed';-inkscape-font-specification:'Ubuntu Condensed, Normal';font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;text-indent:0;text-align:start;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:0px;word-spacing:0px;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:pre;shape-padding:0;shape-margin:0;inline-size:62.2728;opacity:1;vector-effect:none;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.999999px;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;-inkscape-stroke:none;stop-color:#000000;stop-opacity:1"
+       x="255.30951"
+       y="773.11206"
+       id="text101"
+       transform="matrix(0.26458333,0,0,0.26458333,0,-11.641668)"><tspan
+         x="255.30951"
+         y="773.11206"
+         id="tspan96">ok</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:16px;line-height:125%;font-family:'Ubuntu Condensed';-inkscape-font-specification:'Ubuntu Condensed, Normal';font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;font-feature-settings:normal;font-variation-settings:normal;text-indent:0;text-align:start;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:0px;word-spacing:0px;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:normal;shape-padding:0;shape-margin:0;inline-size:0;opacity:1;vector-effect:none;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1.42857px;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;-inkscape-stroke:none;stop-color:#000000;stop-opacity:1"
+       x="185.27213"
+       y="755.90552"
+       id="text102"
+       transform="matrix(0.18520833,0,0,0.18520833,7.7394858,39.31597)"><tspan
+         sodipodi:role="line"
+         id="tspan102"
+         x="185.27213"
+         y="755.90552"
+         style="stroke-width:1.42857px">rdfdb</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:3.175px;line-height:125%;font-family:'Ubuntu Condensed';-inkscape-font-specification:'Ubuntu Condensed, Normal';font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;text-indent:0;text-align:start;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:0px;word-spacing:0px;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:pre;shape-padding:0;shape-margin:0;inline-size:74.9301;opacity:1;vector-effect:none;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.264583px;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;-inkscape-stroke:none;stop-color:#000000;stop-opacity:1"
+       x="122.73514"
+       y="193.17496"
+       id="text103"><tspan
+         x="122.73514"
+         y="193.17496"
+         id="tspan97">C1 learns that proposedVx is now v2
+</tspan><tspan
+         x="122.73514"
+         y="197.14371"
+         id="tspan98">C2 forgot what v1 has, and keeps its local patch.
+</tspan><tspan
+         x="122.73514"
+         y="201.11246"
+         id="tspan99">Neither C1 (knew v2) nor C2 (forgot v1) cares </tspan><tspan
+         x="122.73514"
+         y="205.08121"
+         id="tspan100">about the contents of this patch! C2 would have, if </tspan><tspan
+         x="122.73514"
+         y="209.04996"
+         id="tspan101">it remembered v1.</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:12px;line-height:125%;font-family:'Ubuntu Condensed';-inkscape-font-specification:'Ubuntu Condensed, Normal';font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;text-indent:0;text-align:start;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:0px;word-spacing:0px;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:normal;shape-padding:0;shape-margin:0;inline-size:0;opacity:1;vector-effect:none;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.999999px;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;-inkscape-stroke:none;stop-color:#000000;stop-opacity:1"
+       x="570.06024"
+       y="659.49335"
+       id="text105"
+       transform="matrix(0.26458333,0,0,0.26458333,47.06786,2.1166667)"><tspan
+         sodipodi:role="line"
+         id="tspan105"
+         x="570.06024"
+         y="659.49335">sendMe(v0 to v2)</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:12px;line-height:125%;font-family:'Ubuntu Condensed';-inkscape-font-specification:'Ubuntu Condensed, Normal';font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;text-indent:0;text-align:start;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:0px;word-spacing:0px;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:normal;shape-padding:0;shape-margin:0;inline-size:0;opacity:1;vector-effect:none;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.999999px;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;-inkscape-stroke:none;stop-color:#000000;stop-opacity:1"
+       x="737.00787"
+       y="680.315"
+       id="text106"
+       transform="matrix(0.26458333,0,0,0.26458333,31.750014,1.5875)"><tspan
+         sodipodi:role="line"
+         id="tspan106"
+         x="737.00787"
+         y="680.315">edit(from=v0, to=v2)</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:3.175px;line-height:125%;font-family:'Ubuntu Condensed';-inkscape-font-specification:'Ubuntu Condensed, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;text-decoration-color:#000000;letter-spacing:0px;word-spacing:0px;fill:#000000;stroke:none;stroke-width:0.264583px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;-inkscape-stroke:none;stop-color:#000000"
+       x="230.25616"
+       y="193.17496"
+       id="text107"><tspan
+         sodipodi:role="line"
+         id="tspan107"
+         style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:3.175px;font-family:'Ubuntu Condensed';-inkscape-font-specification:'Ubuntu Condensed, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;stroke:none;stroke-width:0.264583px"
+         x="230.25616"
+         y="193.17496">this goes to C2 only</tspan></text>
+  </g>
+</svg>