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Grudgingly moved to separate files for SVGs.

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pull/13171/head
Joshua Haberman 3 years ago
parent 8716432bfa
commit 5832e8038b
7 changed files with 320 additions and 297 deletions
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  1. 2
      .gitignore
  2. 19
      doc/render.py
  3. 304
      doc/wrapping-upb.md
  4. 42
      doc/wrapping-upb/1.svg
  5. 47
      doc/wrapping-upb/2.svg
  6. 64
      doc/wrapping-upb/3.svg
  7. 139
      doc/wrapping-upb/4.svg

2
.gitignore vendored
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@ -1,4 +1,4 @@
*.s??
*.sw?
obj/
lib/
bazel-*

19
doc/render.py
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@ -2,6 +2,8 @@
import subprocess
import sys
import shutil
import os
if len(sys.argv) < 2:
print("Must pass a filename argument")
@ -9,11 +11,18 @@ if len(sys.argv) < 2:
in_filename = sys.argv[1]
out_filename = in_filename.replace(".in.md", ".md")
out_dir = in_filename.replace(".in.md", "")
if in_filename == out_filename:
print("File must end in .in.md")
sys.exit(1)
if os.path.isdir(out_dir):
shutil.rmtree(out_dir)
os.mkdir(out_dir)
file_num = 1
with open(out_filename, "wb") as out_file, open(in_filename, "rb") as in_file:
for line in in_file:
if line.startswith(b"```dot"):
@ -24,9 +33,11 @@ with open(out_filename, "wb") as out_file, open(in_filename, "rb") as in_file:
break
dot_lines.append(dot_line)
dot_input = b"".join(dot_lines)
svg = subprocess.check_output(['dot', '-Tsvg'], input=dot_input)
out_file.write(b"<div align=center>")
out_file.write(svg)
out_file.write(b"</div>")
svg_filename = out_dir + "/" + str(file_num) + ".svg"
svg = subprocess.check_output(['dot', '-Tsvg', '-o', svg_filename], input=dot_input)
out_file.write(b"<div align=center>\n")
out_file.write(b"<img src='%s'/>\n" % (svg_filename.encode('utf-8')))
out_file.write(b"</div>\n")
file_num += 1
else:
out_file.write(line)

304
doc/wrapping-upb.md
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@ -178,102 +178,19 @@ upb defines data structures in C to represent messages, arrays (repeated
fields), and maps. A protobuf message is a hierarchical tree of these objects.
For example, a relatively simple protobuf tree might look something like this:
<div align=center><?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<!-- Generated by graphviz version 2.43.0 (0)
-->
<!-- Title: G Pages: 1 -->
<svg width="222pt" height="98pt"
viewBox="0.00 0.00 222.00 98.00" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g id="graph0" class="graph" transform="scale(1 1) rotate(0) translate(4 94)">
<title>G</title>
<!-- upb_msg -->
<g id="node1" class="node">
<title>upb_msg</title>
<path fill="#7fc97f" stroke="black" d="M77,-63C77,-63 12,-63 12,-63 6,-63 0,-57 0,-51 0,-51 0,-39 0,-39 0,-33 6,-27 12,-27 12,-27 77,-27 77,-27 83,-27 89,-33 89,-39 89,-39 89,-51 89,-51 89,-57 83,-63 77,-63"/>
<text text-anchor="middle" x="44.5" y="-41.3" font-family="Times,serif" font-size="14.00">upb Message</text>
</g>
<!-- upb_msg2 -->
<g id="node2" class="node">
<title>upb_msg2</title>
<path fill="#7fc97f" stroke="black" d="M202,-90C202,-90 137,-90 137,-90 131,-90 125,-84 125,-78 125,-78 125,-66 125,-66 125,-60 131,-54 137,-54 137,-54 202,-54 202,-54 208,-54 214,-60 214,-66 214,-66 214,-78 214,-78 214,-84 208,-90 202,-90"/>
<text text-anchor="middle" x="169.5" y="-68.3" font-family="Times,serif" font-size="14.00">upb Message</text>
</g>
<!-- upb_msg&#45;&gt;upb_msg2 -->
<g id="edge1" class="edge">
<title>upb_msg&#45;&gt;upb_msg2</title>
<path fill="none" stroke="black" d="M89.21,-54.6C97.55,-56.43 106.36,-58.36 114.97,-60.25"/>
<polygon fill="black" stroke="black" points="114.41,-63.71 124.93,-62.44 115.91,-56.87 114.41,-63.71"/>
</g>
<!-- upb_array -->
<g id="node3" class="node">
<title>upb_array</title>
<path fill="#7fc97f" stroke="black" d="M193,-36C193,-36 146,-36 146,-36 140,-36 134,-30 134,-24 134,-24 134,-12 134,-12 134,-6 140,0 146,0 146,0 193,0 193,0 199,0 205,-6 205,-12 205,-12 205,-24 205,-24 205,-30 199,-36 193,-36"/>
<text text-anchor="middle" x="169.5" y="-14.3" font-family="Times,serif" font-size="14.00">upb Array</text>
</g>
<!-- upb_msg&#45;&gt;upb_array -->
<g id="edge2" class="edge">
<title>upb_msg&#45;&gt;upb_array</title>
<path fill="none" stroke="black" d="M89.21,-35.4C100.42,-32.94 112.49,-30.3 123.75,-27.82"/>
<polygon fill="black" stroke="black" points="124.8,-31.18 133.81,-25.61 123.3,-24.34 124.8,-31.18"/>
</g>
</g>
</svg>
<div align=center>
<img src='wrapping-upb/1.svg'/>
</div>
All upb objects are allocated from an arena. An arena lets you allocate objects
individually, but you cannot free individual objects; you can only free the arena
as a whole. When the arena is freed, all of the individual objects allocated
from that arena are freed together.
<div align=center><?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<!-- Generated by graphviz version 2.43.0 (0)
-->
<!-- Title: G Pages: 1 -->
<svg width="254pt" height="153pt"
viewBox="0.00 0.00 254.00 153.00" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g id="graph0" class="graph" transform="scale(1 1) rotate(0) translate(4 149)">
<title>G</title>
<g id="clust1" class="cluster">
<title>cluster_0</title>
<path fill="gray" stroke="black" d="M20,-8C20,-8 226,-8 226,-8 232,-8 238,-14 238,-20 238,-20 238,-125 238,-125 238,-131 232,-137 226,-137 226,-137 20,-137 20,-137 14,-137 8,-131 8,-125 8,-125 8,-20 8,-20 8,-14 14,-8 20,-8"/>
<text text-anchor="middle" x="123" y="-121.8" font-family="Times,serif" font-size="14.00">upb Arena</text>
</g>
<!-- upb_msg -->
<g id="node1" class="node">
<title>upb_msg</title>
<path fill="#7fc97f" stroke="black" d="M93,-79C93,-79 28,-79 28,-79 22,-79 16,-73 16,-67 16,-67 16,-55 16,-55 16,-49 22,-43 28,-43 28,-43 93,-43 93,-43 99,-43 105,-49 105,-55 105,-55 105,-67 105,-67 105,-73 99,-79 93,-79"/>
<text text-anchor="middle" x="60.5" y="-57.3" font-family="Times,serif" font-size="14.00">upb Message</text>
</g>
<!-- upb_array -->
<g id="node2" class="node">
<title>upb_array</title>
<path fill="#7fc97f" stroke="black" d="M209,-52C209,-52 162,-52 162,-52 156,-52 150,-46 150,-40 150,-40 150,-28 150,-28 150,-22 156,-16 162,-16 162,-16 209,-16 209,-16 215,-16 221,-22 221,-28 221,-28 221,-40 221,-40 221,-46 215,-52 209,-52"/>
<text text-anchor="middle" x="185.5" y="-30.3" font-family="Times,serif" font-size="14.00">upb Array</text>
</g>
<!-- upb_msg&#45;&gt;upb_array -->
<g id="edge1" class="edge">
<title>upb_msg&#45;&gt;upb_array</title>
<path fill="none" stroke="black" d="M105.21,-51.4C116.42,-48.94 128.49,-46.3 139.75,-43.82"/>
<polygon fill="black" stroke="black" points="140.8,-47.18 149.81,-41.61 139.3,-40.34 140.8,-47.18"/>
</g>
<!-- upb_msg2 -->
<g id="node3" class="node">
<title>upb_msg2</title>
<path fill="#7fc97f" stroke="black" d="M218,-106C218,-106 153,-106 153,-106 147,-106 141,-100 141,-94 141,-94 141,-82 141,-82 141,-76 147,-70 153,-70 153,-70 218,-70 218,-70 224,-70 230,-76 230,-82 230,-82 230,-94 230,-94 230,-100 224,-106 218,-106"/>
<text text-anchor="middle" x="185.5" y="-84.3" font-family="Times,serif" font-size="14.00">upb Message</text>
</g>
<!-- upb_msg&#45;&gt;upb_msg2 -->
<g id="edge2" class="edge">
<title>upb_msg&#45;&gt;upb_msg2</title>
<path fill="none" stroke="black" d="M105.21,-70.6C113.55,-72.43 122.36,-74.36 130.97,-76.25"/>
<polygon fill="black" stroke="black" points="130.41,-79.71 140.93,-78.44 131.91,-72.87 130.41,-79.71"/>
</g>
</g>
</svg>
<div align=center>
<img src='wrapping-upb/2.svg'/>
</div>
In simple cases, the entire tree of objects will all live in a single arena.
This has the nice property that there cannot be any dangling pointers between
objects, since all objects are freed at the same time.
@ -282,71 +199,10 @@ However upb allows you to create links between any two objects, whether or
not they are in the same arena. The library does not know or care what arenas
the objects are in when you create links between them.
<div align=center><?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<!-- Generated by graphviz version 2.43.0 (0)
-->
<!-- Title: G Pages: 1 -->
<svg width="409pt" height="153pt"
viewBox="0.00 0.00 409.00 153.00" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g id="graph0" class="graph" transform="scale(1 1) rotate(0) translate(4 149)">
<title>G</title>
<g id="clust1" class="cluster">
<title>cluster_0</title>
<path fill="gray" stroke="black" d="M20,-8C20,-8 246,-8 246,-8 252,-8 258,-14 258,-20 258,-20 258,-125 258,-125 258,-131 252,-137 246,-137 246,-137 20,-137 20,-137 14,-137 8,-131 8,-125 8,-125 8,-20 8,-20 8,-14 14,-8 20,-8"/>
<text text-anchor="middle" x="133" y="-121.8" font-family="Times,serif" font-size="14.00">upb Arena 1</text>
</g>
<g id="clust2" class="cluster">
<title>cluster_1</title>
<path fill="gray" stroke="black" d="M290,-62C290,-62 381,-62 381,-62 387,-62 393,-68 393,-74 393,-74 393,-125 393,-125 393,-131 387,-137 381,-137 381,-137 290,-137 290,-137 284,-137 278,-131 278,-125 278,-125 278,-74 278,-74 278,-68 284,-62 290,-62"/>
<text text-anchor="middle" x="335.5" y="-121.8" font-family="Times,serif" font-size="14.00">upb Arena 2</text>
</g>
<!-- upb_msg -->
<g id="node1" class="node">
<title>upb_msg</title>
<path fill="#7fc97f" stroke="black" d="M103,-79C103,-79 28,-79 28,-79 22,-79 16,-73 16,-67 16,-67 16,-55 16,-55 16,-49 22,-43 28,-43 28,-43 103,-43 103,-43 109,-43 115,-49 115,-55 115,-55 115,-67 115,-67 115,-73 109,-79 103,-79"/>
<text text-anchor="middle" x="65.5" y="-57.3" font-family="Times,serif" font-size="14.00">upb Message 1</text>
</g>
<!-- upb_array -->
<g id="node2" class="node">
<title>upb_array</title>
<path fill="#7fc97f" stroke="black" d="M224,-52C224,-52 177,-52 177,-52 171,-52 165,-46 165,-40 165,-40 165,-28 165,-28 165,-22 171,-16 177,-16 177,-16 224,-16 224,-16 230,-16 236,-22 236,-28 236,-28 236,-40 236,-40 236,-46 230,-52 224,-52"/>
<text text-anchor="middle" x="200.5" y="-30.3" font-family="Times,serif" font-size="14.00">upb Array</text>
</g>
<!-- upb_msg&#45;&gt;upb_array -->
<g id="edge1" class="edge">
<title>upb_msg&#45;&gt;upb_array</title>
<path fill="none" stroke="black" d="M115.27,-51.1C128.26,-48.46 142.22,-45.63 154.96,-43.04"/>
<polygon fill="black" stroke="black" points="155.78,-46.45 164.88,-41.03 154.39,-39.59 155.78,-46.45"/>
</g>
<!-- upb_msg2 -->
<g id="node3" class="node">
<title>upb_msg2</title>
<path fill="#7fc97f" stroke="black" d="M238,-106C238,-106 163,-106 163,-106 157,-106 151,-100 151,-94 151,-94 151,-82 151,-82 151,-76 157,-70 163,-70 163,-70 238,-70 238,-70 244,-70 250,-76 250,-82 250,-82 250,-94 250,-94 250,-100 244,-106 238,-106"/>
<text text-anchor="middle" x="200.5" y="-84.3" font-family="Times,serif" font-size="14.00">upb Message 2</text>
</g>
<!-- upb_msg&#45;&gt;upb_msg2 -->
<g id="edge2" class="edge">
<title>upb_msg&#45;&gt;upb_msg2</title>
<path fill="none" stroke="black" d="M115.27,-70.9C123.58,-72.59 132.29,-74.36 140.83,-76.09"/>
<polygon fill="black" stroke="black" points="140.24,-79.54 150.74,-78.1 141.63,-72.68 140.24,-79.54"/>
</g>
<!-- upb_msg3 -->
<g id="node4" class="node">
<title>upb_msg3</title>
<path fill="#7fc97f" stroke="black" d="M373,-106C373,-106 298,-106 298,-106 292,-106 286,-100 286,-94 286,-94 286,-82 286,-82 286,-76 292,-70 298,-70 298,-70 373,-70 373,-70 379,-70 385,-76 385,-82 385,-82 385,-94 385,-94 385,-100 379,-106 373,-106"/>
<text text-anchor="middle" x="335.5" y="-84.3" font-family="Times,serif" font-size="14.00">upb Message 3</text>
</g>
<!-- upb_msg2&#45;&gt;upb_msg3 -->
<g id="edge3" class="edge">
<title>upb_msg2&#45;&gt;upb_msg3</title>
<path fill="none" stroke="black" d="M250.27,-88C258.49,-88 267.1,-88 275.55,-88"/>
<polygon fill="black" stroke="black" points="275.74,-91.5 285.74,-88 275.74,-84.5 275.74,-91.5"/>
</g>
</g>
</svg>
<div align=center>
<img src='wrapping-upb/3.svg'/>
</div>
When objects are on separate arenas, it is the user's responsibility to ensure
that there are no dangling pointers. In the example above, this means Arena 2
must outlive Message 1 and Message 2.
@ -364,146 +220,10 @@ GC'd until all of the C objects in that arena have become unreachable.
For this example, we will assume we are wrapping upb in Python:
<div align=center><?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<!-- Generated by graphviz version 2.43.0 (0)
-->
<!-- Title: G Pages: 1 -->
<svg width="417pt" height="303pt"
viewBox="0.00 0.00 417.00 303.00" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g id="graph0" class="graph" transform="scale(1 1) rotate(0) translate(4 299)">
<title>G</title>
<g id="clust1" class="cluster">
<title>cluster_1</title>
<path fill="gray" stroke="black" d="M29,-98C29,-98 380,-98 380,-98 386,-98 392,-104 392,-110 392,-110 392,-215 392,-215 392,-221 386,-227 380,-227 380,-227 29,-227 29,-227 23,-227 17,-221 17,-215 17,-215 17,-110 17,-110 17,-104 23,-98 29,-98"/>
<text text-anchor="middle" x="204.5" y="-211.8" font-family="Times,serif" font-size="14.00">upb Arena</text>
</g>
<g id="clust2" class="cluster">
<title>cluster_python</title>
<polygon fill="transparent" stroke="transparent" points="8,-235 8,-287 401,-287 401,-235 8,-235"/>
</g>
<g id="clust6" class="cluster">
<title>cluster_01</title>
<polygon fill="transparent" stroke="transparent" points="8.5,-8 8.5,-90 239.5,-90 239.5,-8 8.5,-8"/>
</g>
<!-- upb_msg -->
<g id="node1" class="node">
<title>upb_msg</title>
<path fill="#7fc97f" stroke="black" d="M102,-169C102,-169 37,-169 37,-169 31,-169 25,-163 25,-157 25,-157 25,-145 25,-145 25,-139 31,-133 37,-133 37,-133 102,-133 102,-133 108,-133 114,-139 114,-145 114,-145 114,-157 114,-157 114,-163 108,-169 102,-169"/>
<text text-anchor="middle" x="69.5" y="-147.3" font-family="Times,serif" font-size="14.00">upb Message</text>
</g>
<!-- upb_array -->
<g id="node2" class="node">
<title>upb_array</title>
<path fill="#7fc97f" stroke="black" d="M363,-142C363,-142 316,-142 316,-142 310,-142 304,-136 304,-130 304,-130 304,-118 304,-118 304,-112 310,-106 316,-106 316,-106 363,-106 363,-106 369,-106 375,-112 375,-118 375,-118 375,-130 375,-130 375,-136 369,-142 363,-142"/>
<text text-anchor="middle" x="339.5" y="-120.3" font-family="Times,serif" font-size="14.00">upb Array</text>
</g>
<!-- upb_msg&#45;&gt;upb_array -->
<g id="edge1" class="edge">
<title>upb_msg&#45;&gt;upb_array</title>
<path fill="none" stroke="black" stroke-dasharray="5,2" d="M114.33,-139.43C128.49,-136.14 144.32,-132.93 159,-131 204.59,-125.01 257.21,-123.6 293.64,-123.48"/>
<polygon fill="black" stroke="black" points="293.93,-126.98 303.93,-123.48 293.93,-119.98 293.93,-126.98"/>
</g>
<!-- upb_msg2 -->
<g id="node3" class="node">
<title>upb_msg2</title>
<path fill="#7fc97f" stroke="black" d="M372,-196C372,-196 307,-196 307,-196 301,-196 295,-190 295,-184 295,-184 295,-172 295,-172 295,-166 301,-160 307,-160 307,-160 372,-160 372,-160 378,-160 384,-166 384,-172 384,-172 384,-184 384,-184 384,-190 378,-196 372,-196"/>
<text text-anchor="middle" x="339.5" y="-174.3" font-family="Times,serif" font-size="14.00">upb Message</text>
</g>
<!-- upb_msg&#45;&gt;upb_msg2 -->
<g id="edge2" class="edge">
<title>upb_msg&#45;&gt;upb_msg2</title>
<path fill="none" stroke="black" stroke-dasharray="5,2" d="M108.38,-169.06C123.72,-175.44 141.85,-181.82 159,-185 200.72,-192.74 248.8,-190.27 284.7,-186.27"/>
<polygon fill="black" stroke="black" points="285.44,-189.7 294.95,-185.04 284.61,-182.75 285.44,-189.7"/>
</g>
<!-- dummy -->
<!-- dummy&#45;&gt;upb_array -->
<!-- dummy&#45;&gt;upb_msg2 -->
<!-- py_upb_msg -->
<g id="node5" class="node">
<title>py_upb_msg</title>
<path fill="#beaed4" stroke="black" d="M111,-279C111,-279 28,-279 28,-279 22,-279 16,-273 16,-267 16,-267 16,-255 16,-255 16,-249 22,-243 28,-243 28,-243 111,-243 111,-243 117,-243 123,-249 123,-255 123,-255 123,-267 123,-267 123,-273 117,-279 111,-279"/>
<text text-anchor="middle" x="69.5" y="-257.3" font-family="Times,serif" font-size="14.00">Python Message</text>
</g>
<!-- py_upb_msg&#45;&gt;upb_msg -->
<g id="edge3" class="edge">
<title>py_upb_msg&#45;&gt;upb_msg</title>
<path fill="none" stroke="black" stroke-dasharray="5,2" d="M69.5,-242.68C69.5,-221.49 69.5,-200.3 69.5,-179.11"/>
<polygon fill="black" stroke="black" points="73,-179.05 69.5,-169.05 66,-179.05 73,-179.05"/>
</g>
<!-- py_upb_arena -->
<g id="node7" class="node">
<title>py_upb_arena</title>
<path fill="#beaed4" stroke="black" d="M238,-279C238,-279 171,-279 171,-279 165,-279 159,-273 159,-267 159,-267 159,-255 159,-255 159,-249 165,-243 171,-243 171,-243 238,-243 238,-243 244,-243 250,-249 250,-255 250,-255 250,-267 250,-267 250,-273 244,-279 238,-279"/>
<text text-anchor="middle" x="204.5" y="-257.3" font-family="Times,serif" font-size="14.00">Python Arena</text>
</g>
<!-- py_upb_msg&#45;&gt;py_upb_arena -->
<g id="edge6" class="edge">
<title>py_upb_msg&#45;&gt;py_upb_arena</title>
<path fill="none" stroke="#008b45" d="M123.07,-261C131.43,-261 140.1,-261 148.51,-261"/>
<polygon fill="#008b45" stroke="#008b45" points="148.62,-264.5 158.62,-261 148.62,-257.5 148.62,-264.5"/>
</g>
<!-- py_upb_msg2 -->
<g id="node6" class="node">
<title>py_upb_msg2</title>
<path fill="#beaed4" stroke="black" d="M381,-279C381,-279 298,-279 298,-279 292,-279 286,-273 286,-267 286,-267 286,-255 286,-255 286,-249 292,-243 298,-243 298,-243 381,-243 381,-243 387,-243 393,-249 393,-255 393,-255 393,-267 393,-267 393,-273 387,-279 381,-279"/>
<text text-anchor="middle" x="339.5" y="-257.3" font-family="Times,serif" font-size="14.00">Python Message</text>
</g>
<!-- py_upb_msg2&#45;&gt;upb_msg2 -->
<g id="edge4" class="edge">
<title>py_upb_msg2&#45;&gt;upb_msg2</title>
<path fill="none" stroke="black" stroke-dasharray="5,2" d="M339.5,-242.76C339.5,-230.63 339.5,-218.49 339.5,-206.35"/>
<polygon fill="black" stroke="black" points="343,-206.16 339.5,-196.16 336,-206.16 343,-206.16"/>
</g>
<!-- py_upb_msg2&#45;&gt;py_upb_arena -->
<g id="edge5" class="edge">
<title>py_upb_msg2&#45;&gt;py_upb_arena</title>
<path fill="none" stroke="#008b45" d="M285.91,-261C277.49,-261 268.77,-261 260.31,-261"/>
<polygon fill="#008b45" stroke="#008b45" points="260.16,-257.5 250.16,-261 260.16,-264.5 260.16,-257.5"/>
</g>
<!-- py_upb_arena&#45;&gt;dummy -->
<g id="edge7" class="edge">
<title>py_upb_arena&#45;&gt;dummy</title>
<path fill="none" stroke="red" d="M204.5,-242.76C204.5,-240.95 204.5,-239.15 204.5,-237.34"/>
<polygon fill="red" stroke="red" points="208,-237 204.5,-227 201,-237 208,-237"/>
</g>
<!-- key -->
<g id="node8" class="node">
<title>key</title>
<text text-anchor="start" x="72.5" y="-63.8" font-family="Times,serif" font-size="14.00">raw ptr</text>
<text text-anchor="start" x="56.5" y="-44.8" font-family="Times,serif" font-size="14.00">unique ptr</text>
<text text-anchor="start" x="26.5" y="-25.8" font-family="Times,serif" font-size="14.00">shared (GC) ptr</text>
</g>
<!-- key2 -->
<g id="node9" class="node">
<title>key2</title>
<text text-anchor="start" x="202.5" y="-63.8" font-family="Times,serif" font-size="14.00"> </text>
<text text-anchor="start" x="202.5" y="-44.8" font-family="Times,serif" font-size="14.00"> </text>
<text text-anchor="start" x="202.5" y="-25.8" font-family="Times,serif" font-size="14.00"> </text>
</g>
<!-- key&#45;&gt;key2 -->
<g id="edge10" class="edge">
<title>key:e&#45;&gt;key2:w</title>
<path fill="none" stroke="black" stroke-dasharray="5,2" d="M115.5,-68C149.19,-68 160.08,-68 189.31,-68"/>
<polygon fill="black" stroke="black" points="189.5,-71.5 199.5,-68 189.5,-64.5 189.5,-71.5"/>
</g>
<!-- key&#45;&gt;key2 -->
<g id="edge11" class="edge">
<title>key:e&#45;&gt;key2:w</title>
<path fill="none" stroke="red" d="M115.5,-48C149.19,-48 160.08,-48 189.31,-48"/>
<polygon fill="red" stroke="red" points="189.5,-51.5 199.5,-48 189.5,-44.5 189.5,-51.5"/>
</g>
<!-- key&#45;&gt;key2 -->
<g id="edge12" class="edge">
<title>key:e&#45;&gt;key2:w</title>
<path fill="none" stroke="#008b45" d="M115.5,-29C149.19,-29 160.08,-29 189.31,-29"/>
<polygon fill="#008b45" stroke="#008b45" points="189.5,-32.5 199.5,-29 189.5,-25.5 189.5,-32.5"/>
</g>
<!-- key2&#45;&gt;upb_msg -->
</g>
</svg>
<div align=center>
<img src='wrapping-upb/4.svg'/>
</div>
In this example we have three different kinds of pointers:
* **raw ptr**: This is a pointer that carries no ownership.

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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<!-- Generated by graphviz version 2.43.0 (0)
-->
<!-- Title: G Pages: 1 -->
<svg width="222pt" height="98pt"
viewBox="0.00 0.00 222.00 98.00" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g id="graph0" class="graph" transform="scale(1 1) rotate(0) translate(4 94)">
<title>G</title>
<!-- upb_msg -->
<g id="node1" class="node">
<title>upb_msg</title>
<path fill="#7fc97f" stroke="black" d="M77,-63C77,-63 12,-63 12,-63 6,-63 0,-57 0,-51 0,-51 0,-39 0,-39 0,-33 6,-27 12,-27 12,-27 77,-27 77,-27 83,-27 89,-33 89,-39 89,-39 89,-51 89,-51 89,-57 83,-63 77,-63"/>
<text text-anchor="middle" x="44.5" y="-41.3" font-family="Times,serif" font-size="14.00">upb Message</text>
</g>
<!-- upb_msg2 -->
<g id="node2" class="node">
<title>upb_msg2</title>
<path fill="#7fc97f" stroke="black" d="M202,-90C202,-90 137,-90 137,-90 131,-90 125,-84 125,-78 125,-78 125,-66 125,-66 125,-60 131,-54 137,-54 137,-54 202,-54 202,-54 208,-54 214,-60 214,-66 214,-66 214,-78 214,-78 214,-84 208,-90 202,-90"/>
<text text-anchor="middle" x="169.5" y="-68.3" font-family="Times,serif" font-size="14.00">upb Message</text>
</g>
<!-- upb_msg&#45;&gt;upb_msg2 -->
<g id="edge1" class="edge">
<title>upb_msg&#45;&gt;upb_msg2</title>
<path fill="none" stroke="black" d="M89.21,-54.6C97.55,-56.43 106.36,-58.36 114.97,-60.25"/>
<polygon fill="black" stroke="black" points="114.41,-63.71 124.93,-62.44 115.91,-56.87 114.41,-63.71"/>
</g>
<!-- upb_array -->
<g id="node3" class="node">
<title>upb_array</title>
<path fill="#7fc97f" stroke="black" d="M193,-36C193,-36 146,-36 146,-36 140,-36 134,-30 134,-24 134,-24 134,-12 134,-12 134,-6 140,0 146,0 146,0 193,0 193,0 199,0 205,-6 205,-12 205,-12 205,-24 205,-24 205,-30 199,-36 193,-36"/>
<text text-anchor="middle" x="169.5" y="-14.3" font-family="Times,serif" font-size="14.00">upb Array</text>
</g>
<!-- upb_msg&#45;&gt;upb_array -->
<g id="edge2" class="edge">
<title>upb_msg&#45;&gt;upb_array</title>
<path fill="none" stroke="black" d="M89.21,-35.4C100.42,-32.94 112.49,-30.3 123.75,-27.82"/>
<polygon fill="black" stroke="black" points="124.8,-31.18 133.81,-25.61 123.3,-24.34 124.8,-31.18"/>
</g>
</g>
</svg>
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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<!-- Generated by graphviz version 2.43.0 (0)
-->
<!-- Title: G Pages: 1 -->
<svg width="254pt" height="153pt"
viewBox="0.00 0.00 254.00 153.00" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g id="graph0" class="graph" transform="scale(1 1) rotate(0) translate(4 149)">
<title>G</title>
<g id="clust1" class="cluster">
<title>cluster_0</title>
<path fill="gray" stroke="black" d="M20,-8C20,-8 226,-8 226,-8 232,-8 238,-14 238,-20 238,-20 238,-125 238,-125 238,-131 232,-137 226,-137 226,-137 20,-137 20,-137 14,-137 8,-131 8,-125 8,-125 8,-20 8,-20 8,-14 14,-8 20,-8"/>
<text text-anchor="middle" x="123" y="-121.8" font-family="Times,serif" font-size="14.00">upb Arena</text>
</g>
<!-- upb_msg -->
<g id="node1" class="node">
<title>upb_msg</title>
<path fill="#7fc97f" stroke="black" d="M93,-79C93,-79 28,-79 28,-79 22,-79 16,-73 16,-67 16,-67 16,-55 16,-55 16,-49 22,-43 28,-43 28,-43 93,-43 93,-43 99,-43 105,-49 105,-55 105,-55 105,-67 105,-67 105,-73 99,-79 93,-79"/>
<text text-anchor="middle" x="60.5" y="-57.3" font-family="Times,serif" font-size="14.00">upb Message</text>
</g>
<!-- upb_array -->
<g id="node2" class="node">
<title>upb_array</title>
<path fill="#7fc97f" stroke="black" d="M209,-52C209,-52 162,-52 162,-52 156,-52 150,-46 150,-40 150,-40 150,-28 150,-28 150,-22 156,-16 162,-16 162,-16 209,-16 209,-16 215,-16 221,-22 221,-28 221,-28 221,-40 221,-40 221,-46 215,-52 209,-52"/>
<text text-anchor="middle" x="185.5" y="-30.3" font-family="Times,serif" font-size="14.00">upb Array</text>
</g>
<!-- upb_msg&#45;&gt;upb_array -->
<g id="edge1" class="edge">
<title>upb_msg&#45;&gt;upb_array</title>
<path fill="none" stroke="black" d="M105.21,-51.4C116.42,-48.94 128.49,-46.3 139.75,-43.82"/>
<polygon fill="black" stroke="black" points="140.8,-47.18 149.81,-41.61 139.3,-40.34 140.8,-47.18"/>
</g>
<!-- upb_msg2 -->
<g id="node3" class="node">
<title>upb_msg2</title>
<path fill="#7fc97f" stroke="black" d="M218,-106C218,-106 153,-106 153,-106 147,-106 141,-100 141,-94 141,-94 141,-82 141,-82 141,-76 147,-70 153,-70 153,-70 218,-70 218,-70 224,-70 230,-76 230,-82 230,-82 230,-94 230,-94 230,-100 224,-106 218,-106"/>
<text text-anchor="middle" x="185.5" y="-84.3" font-family="Times,serif" font-size="14.00">upb Message</text>
</g>
<!-- upb_msg&#45;&gt;upb_msg2 -->
<g id="edge2" class="edge">
<title>upb_msg&#45;&gt;upb_msg2</title>
<path fill="none" stroke="black" d="M105.21,-70.6C113.55,-72.43 122.36,-74.36 130.97,-76.25"/>
<polygon fill="black" stroke="black" points="130.41,-79.71 140.93,-78.44 131.91,-72.87 130.41,-79.71"/>
</g>
</g>
</svg>
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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<!-- Generated by graphviz version 2.43.0 (0)
-->
<!-- Title: G Pages: 1 -->
<svg width="409pt" height="153pt"
viewBox="0.00 0.00 409.00 153.00" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g id="graph0" class="graph" transform="scale(1 1) rotate(0) translate(4 149)">
<title>G</title>
<g id="clust1" class="cluster">
<title>cluster_0</title>
<path fill="gray" stroke="black" d="M20,-8C20,-8 246,-8 246,-8 252,-8 258,-14 258,-20 258,-20 258,-125 258,-125 258,-131 252,-137 246,-137 246,-137 20,-137 20,-137 14,-137 8,-131 8,-125 8,-125 8,-20 8,-20 8,-14 14,-8 20,-8"/>
<text text-anchor="middle" x="133" y="-121.8" font-family="Times,serif" font-size="14.00">upb Arena 1</text>
</g>
<g id="clust2" class="cluster">
<title>cluster_1</title>
<path fill="gray" stroke="black" d="M290,-62C290,-62 381,-62 381,-62 387,-62 393,-68 393,-74 393,-74 393,-125 393,-125 393,-131 387,-137 381,-137 381,-137 290,-137 290,-137 284,-137 278,-131 278,-125 278,-125 278,-74 278,-74 278,-68 284,-62 290,-62"/>
<text text-anchor="middle" x="335.5" y="-121.8" font-family="Times,serif" font-size="14.00">upb Arena 2</text>
</g>
<!-- upb_msg -->
<g id="node1" class="node">
<title>upb_msg</title>
<path fill="#7fc97f" stroke="black" d="M103,-79C103,-79 28,-79 28,-79 22,-79 16,-73 16,-67 16,-67 16,-55 16,-55 16,-49 22,-43 28,-43 28,-43 103,-43 103,-43 109,-43 115,-49 115,-55 115,-55 115,-67 115,-67 115,-73 109,-79 103,-79"/>
<text text-anchor="middle" x="65.5" y="-57.3" font-family="Times,serif" font-size="14.00">upb Message 1</text>
</g>
<!-- upb_array -->
<g id="node2" class="node">
<title>upb_array</title>
<path fill="#7fc97f" stroke="black" d="M224,-52C224,-52 177,-52 177,-52 171,-52 165,-46 165,-40 165,-40 165,-28 165,-28 165,-22 171,-16 177,-16 177,-16 224,-16 224,-16 230,-16 236,-22 236,-28 236,-28 236,-40 236,-40 236,-46 230,-52 224,-52"/>
<text text-anchor="middle" x="200.5" y="-30.3" font-family="Times,serif" font-size="14.00">upb Array</text>
</g>
<!-- upb_msg&#45;&gt;upb_array -->
<g id="edge1" class="edge">
<title>upb_msg&#45;&gt;upb_array</title>
<path fill="none" stroke="black" d="M115.27,-51.1C128.26,-48.46 142.22,-45.63 154.96,-43.04"/>
<polygon fill="black" stroke="black" points="155.78,-46.45 164.88,-41.03 154.39,-39.59 155.78,-46.45"/>
</g>
<!-- upb_msg2 -->
<g id="node3" class="node">
<title>upb_msg2</title>
<path fill="#7fc97f" stroke="black" d="M238,-106C238,-106 163,-106 163,-106 157,-106 151,-100 151,-94 151,-94 151,-82 151,-82 151,-76 157,-70 163,-70 163,-70 238,-70 238,-70 244,-70 250,-76 250,-82 250,-82 250,-94 250,-94 250,-100 244,-106 238,-106"/>
<text text-anchor="middle" x="200.5" y="-84.3" font-family="Times,serif" font-size="14.00">upb Message 2</text>
</g>
<!-- upb_msg&#45;&gt;upb_msg2 -->
<g id="edge2" class="edge">
<title>upb_msg&#45;&gt;upb_msg2</title>
<path fill="none" stroke="black" d="M115.27,-70.9C123.58,-72.59 132.29,-74.36 140.83,-76.09"/>
<polygon fill="black" stroke="black" points="140.24,-79.54 150.74,-78.1 141.63,-72.68 140.24,-79.54"/>
</g>
<!-- upb_msg3 -->
<g id="node4" class="node">
<title>upb_msg3</title>
<path fill="#7fc97f" stroke="black" d="M373,-106C373,-106 298,-106 298,-106 292,-106 286,-100 286,-94 286,-94 286,-82 286,-82 286,-76 292,-70 298,-70 298,-70 373,-70 373,-70 379,-70 385,-76 385,-82 385,-82 385,-94 385,-94 385,-100 379,-106 373,-106"/>
<text text-anchor="middle" x="335.5" y="-84.3" font-family="Times,serif" font-size="14.00">upb Message 3</text>
</g>
<!-- upb_msg2&#45;&gt;upb_msg3 -->
<g id="edge3" class="edge">
<title>upb_msg2&#45;&gt;upb_msg3</title>
<path fill="none" stroke="black" d="M250.27,-88C258.49,-88 267.1,-88 275.55,-88"/>
<polygon fill="black" stroke="black" points="275.74,-91.5 285.74,-88 275.74,-84.5 275.74,-91.5"/>
</g>
</g>
</svg>
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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<!-- Generated by graphviz version 2.43.0 (0)
-->
<!-- Title: G Pages: 1 -->
<svg width="417pt" height="303pt"
viewBox="0.00 0.00 417.00 303.00" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g id="graph0" class="graph" transform="scale(1 1) rotate(0) translate(4 299)">
<title>G</title>
<g id="clust1" class="cluster">
<title>cluster_1</title>
<path fill="gray" stroke="black" d="M29,-98C29,-98 380,-98 380,-98 386,-98 392,-104 392,-110 392,-110 392,-215 392,-215 392,-221 386,-227 380,-227 380,-227 29,-227 29,-227 23,-227 17,-221 17,-215 17,-215 17,-110 17,-110 17,-104 23,-98 29,-98"/>
<text text-anchor="middle" x="204.5" y="-211.8" font-family="Times,serif" font-size="14.00">upb Arena</text>
</g>
<g id="clust2" class="cluster">
<title>cluster_python</title>
<polygon fill="transparent" stroke="transparent" points="8,-235 8,-287 401,-287 401,-235 8,-235"/>
</g>
<g id="clust6" class="cluster">
<title>cluster_01</title>
<polygon fill="transparent" stroke="transparent" points="8.5,-8 8.5,-90 239.5,-90 239.5,-8 8.5,-8"/>
</g>
<!-- upb_msg -->
<g id="node1" class="node">
<title>upb_msg</title>
<path fill="#7fc97f" stroke="black" d="M102,-169C102,-169 37,-169 37,-169 31,-169 25,-163 25,-157 25,-157 25,-145 25,-145 25,-139 31,-133 37,-133 37,-133 102,-133 102,-133 108,-133 114,-139 114,-145 114,-145 114,-157 114,-157 114,-163 108,-169 102,-169"/>
<text text-anchor="middle" x="69.5" y="-147.3" font-family="Times,serif" font-size="14.00">upb Message</text>
</g>
<!-- upb_array -->
<g id="node2" class="node">
<title>upb_array</title>
<path fill="#7fc97f" stroke="black" d="M363,-142C363,-142 316,-142 316,-142 310,-142 304,-136 304,-130 304,-130 304,-118 304,-118 304,-112 310,-106 316,-106 316,-106 363,-106 363,-106 369,-106 375,-112 375,-118 375,-118 375,-130 375,-130 375,-136 369,-142 363,-142"/>
<text text-anchor="middle" x="339.5" y="-120.3" font-family="Times,serif" font-size="14.00">upb Array</text>
</g>
<!-- upb_msg&#45;&gt;upb_array -->
<g id="edge1" class="edge">
<title>upb_msg&#45;&gt;upb_array</title>
<path fill="none" stroke="black" stroke-dasharray="5,2" d="M114.33,-139.43C128.49,-136.14 144.32,-132.93 159,-131 204.59,-125.01 257.21,-123.6 293.64,-123.48"/>
<polygon fill="black" stroke="black" points="293.93,-126.98 303.93,-123.48 293.93,-119.98 293.93,-126.98"/>
</g>
<!-- upb_msg2 -->
<g id="node3" class="node">
<title>upb_msg2</title>
<path fill="#7fc97f" stroke="black" d="M372,-196C372,-196 307,-196 307,-196 301,-196 295,-190 295,-184 295,-184 295,-172 295,-172 295,-166 301,-160 307,-160 307,-160 372,-160 372,-160 378,-160 384,-166 384,-172 384,-172 384,-184 384,-184 384,-190 378,-196 372,-196"/>
<text text-anchor="middle" x="339.5" y="-174.3" font-family="Times,serif" font-size="14.00">upb Message</text>
</g>
<!-- upb_msg&#45;&gt;upb_msg2 -->
<g id="edge2" class="edge">
<title>upb_msg&#45;&gt;upb_msg2</title>
<path fill="none" stroke="black" stroke-dasharray="5,2" d="M108.38,-169.06C123.72,-175.44 141.85,-181.82 159,-185 200.72,-192.74 248.8,-190.27 284.7,-186.27"/>
<polygon fill="black" stroke="black" points="285.44,-189.7 294.95,-185.04 284.61,-182.75 285.44,-189.7"/>
</g>
<!-- dummy -->
<!-- dummy&#45;&gt;upb_array -->
<!-- dummy&#45;&gt;upb_msg2 -->
<!-- py_upb_msg -->
<g id="node5" class="node">
<title>py_upb_msg</title>
<path fill="#beaed4" stroke="black" d="M111,-279C111,-279 28,-279 28,-279 22,-279 16,-273 16,-267 16,-267 16,-255 16,-255 16,-249 22,-243 28,-243 28,-243 111,-243 111,-243 117,-243 123,-249 123,-255 123,-255 123,-267 123,-267 123,-273 117,-279 111,-279"/>
<text text-anchor="middle" x="69.5" y="-257.3" font-family="Times,serif" font-size="14.00">Python Message</text>
</g>
<!-- py_upb_msg&#45;&gt;upb_msg -->
<g id="edge3" class="edge">
<title>py_upb_msg&#45;&gt;upb_msg</title>
<path fill="none" stroke="black" stroke-dasharray="5,2" d="M69.5,-242.68C69.5,-221.49 69.5,-200.3 69.5,-179.11"/>
<polygon fill="black" stroke="black" points="73,-179.05 69.5,-169.05 66,-179.05 73,-179.05"/>
</g>
<!-- py_upb_arena -->
<g id="node7" class="node">
<title>py_upb_arena</title>
<path fill="#beaed4" stroke="black" d="M238,-279C238,-279 171,-279 171,-279 165,-279 159,-273 159,-267 159,-267 159,-255 159,-255 159,-249 165,-243 171,-243 171,-243 238,-243 238,-243 244,-243 250,-249 250,-255 250,-255 250,-267 250,-267 250,-273 244,-279 238,-279"/>
<text text-anchor="middle" x="204.5" y="-257.3" font-family="Times,serif" font-size="14.00">Python Arena</text>
</g>
<!-- py_upb_msg&#45;&gt;py_upb_arena -->
<g id="edge6" class="edge">
<title>py_upb_msg&#45;&gt;py_upb_arena</title>
<path fill="none" stroke="#008b45" d="M123.07,-261C131.43,-261 140.1,-261 148.51,-261"/>
<polygon fill="#008b45" stroke="#008b45" points="148.62,-264.5 158.62,-261 148.62,-257.5 148.62,-264.5"/>
</g>
<!-- py_upb_msg2 -->
<g id="node6" class="node">
<title>py_upb_msg2</title>
<path fill="#beaed4" stroke="black" d="M381,-279C381,-279 298,-279 298,-279 292,-279 286,-273 286,-267 286,-267 286,-255 286,-255 286,-249 292,-243 298,-243 298,-243 381,-243 381,-243 387,-243 393,-249 393,-255 393,-255 393,-267 393,-267 393,-273 387,-279 381,-279"/>
<text text-anchor="middle" x="339.5" y="-257.3" font-family="Times,serif" font-size="14.00">Python Message</text>
</g>
<!-- py_upb_msg2&#45;&gt;upb_msg2 -->
<g id="edge4" class="edge">
<title>py_upb_msg2&#45;&gt;upb_msg2</title>
<path fill="none" stroke="black" stroke-dasharray="5,2" d="M339.5,-242.76C339.5,-230.63 339.5,-218.49 339.5,-206.35"/>
<polygon fill="black" stroke="black" points="343,-206.16 339.5,-196.16 336,-206.16 343,-206.16"/>
</g>
<!-- py_upb_msg2&#45;&gt;py_upb_arena -->
<g id="edge5" class="edge">
<title>py_upb_msg2&#45;&gt;py_upb_arena</title>
<path fill="none" stroke="#008b45" d="M285.91,-261C277.49,-261 268.77,-261 260.31,-261"/>
<polygon fill="#008b45" stroke="#008b45" points="260.16,-257.5 250.16,-261 260.16,-264.5 260.16,-257.5"/>
</g>
<!-- py_upb_arena&#45;&gt;dummy -->
<g id="edge7" class="edge">
<title>py_upb_arena&#45;&gt;dummy</title>
<path fill="none" stroke="red" d="M204.5,-242.76C204.5,-240.95 204.5,-239.15 204.5,-237.34"/>
<polygon fill="red" stroke="red" points="208,-237 204.5,-227 201,-237 208,-237"/>
</g>
<!-- key -->
<g id="node8" class="node">
<title>key</title>
<text text-anchor="start" x="72.5" y="-63.8" font-family="Times,serif" font-size="14.00">raw ptr</text>
<text text-anchor="start" x="56.5" y="-44.8" font-family="Times,serif" font-size="14.00">unique ptr</text>
<text text-anchor="start" x="26.5" y="-25.8" font-family="Times,serif" font-size="14.00">shared (GC) ptr</text>
</g>
<!-- key2 -->
<g id="node9" class="node">
<title>key2</title>
<text text-anchor="start" x="202.5" y="-63.8" font-family="Times,serif" font-size="14.00"> </text>
<text text-anchor="start" x="202.5" y="-44.8" font-family="Times,serif" font-size="14.00"> </text>
<text text-anchor="start" x="202.5" y="-25.8" font-family="Times,serif" font-size="14.00"> </text>
</g>
<!-- key&#45;&gt;key2 -->
<g id="edge10" class="edge">
<title>key:e&#45;&gt;key2:w</title>
<path fill="none" stroke="black" stroke-dasharray="5,2" d="M115.5,-68C149.19,-68 160.08,-68 189.31,-68"/>
<polygon fill="black" stroke="black" points="189.5,-71.5 199.5,-68 189.5,-64.5 189.5,-71.5"/>
</g>
<!-- key&#45;&gt;key2 -->
<g id="edge11" class="edge">
<title>key:e&#45;&gt;key2:w</title>
<path fill="none" stroke="red" d="M115.5,-48C149.19,-48 160.08,-48 189.31,-48"/>
<polygon fill="red" stroke="red" points="189.5,-51.5 199.5,-48 189.5,-44.5 189.5,-51.5"/>
</g>
<!-- key&#45;&gt;key2 -->
<g id="edge12" class="edge">
<title>key:e&#45;&gt;key2:w</title>
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