annotate README.txt @ 50:d837f2031715

notes
author Jeff Hammel <jhammel@mozilla.com>
date Fri, 03 May 2013 09:25:49 -0700
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1 WSGraph
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2 ===========
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3
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4 WSGI graph server
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7 Directed Graphs
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8 ===============
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9
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10 Storage
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11 -------
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12
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13 A directed graph may be expressed as JSON::
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15 {'nodes': {'node1': {'metadata1': value, ...},
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16 'node2': {'metadata1': value, ...}}.
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17 'edges': {'node1': {'node2': {'metadata': value}, ...},
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18 ...},
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19 'graphmetadata': value,
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20 ...}
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22 In languages like python, which can hash (key, value) pairs, the edges
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23 may be more conveniently hashed::
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24
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25 edges[('foo', 'bar')] = {'metadata': value}
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27 A directed graph may be stored in a RDB::
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28
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29 Table: *nodes*
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31 +----+---------+---------+---+
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32 |node|metadata1|metadata2|...|
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33 +====+=========+=========+===+
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34 |foo |value |value | |
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35 +----+---------+---------+---+
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36 |bar |value |value | |
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37 +----+---------+---------+---+
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38
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39 Table: *edges*
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41 +-----+-----+---------+---------+---+
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42 |node1|node2|metadata1|metadata2|...|
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43 +=====+=====+=========+=========+===+
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44 |foo |bar |value |value | |
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45 +-----+-----+---------+---------+---+
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47 Note that the nodes table has unique keys, but the edges table has
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48 rows identified only by the ordered set of two keys: node1 and node2.
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49
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50 Previous formats use a node and value hash of a string: the nodes have
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51 a given name. While this is convenient for human identification, a
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52 more efficient hashing mechanism may be achieved by an algorithm.
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53 Since a edge is a unique hash of two nodes, the nodes may be numbered
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54 with an appropriate algorithm giving a unique hash per edge.
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55
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56
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57 Higher Dimensionality
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58 ---------------------
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59
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60 * faces
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61 * ...
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63
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64 Links
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65 -----
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66
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67 Javascript:
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68 * http://www.jgraph.com/mxgraph.html
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69 Interactive JavaScript HTML 5 Diagramming Library;
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70 demo at https://www.draw.io/
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71 * http://www.graphdracula.net/
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72 * http://thejit.org/
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73
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74 Graph DBs:
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75 * https://pypi.python.org/pypi/ajgu : Graphe database with several
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76 backends architecture in mind
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77
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79 Ideas
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80 -----
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81
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82 I work at automation and testing at Mozilla, but have been known to
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83 don multiple hats, and, not surprisingly, I think a lot about how the
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84 web works. So I just read Stuart's blog post and couldn't help but
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85 feel that it plays somewhat in to my idea of mine.
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86
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87 Background....
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88
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89 The web is a directed graph (
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90 http://en.wikipedia.org/wiki/Directed_graph ). The nodes of the
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91 directed graphs are web pages and the edges of the directed graphs are
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92 produced when you clicked on a link. This gives a unique opportunity
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93 to provide maps of the web. There are a few components in this
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94 visualization.
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95
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96 A site map. This is a map that sits on a server. When a visitor
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97 clicks on a link, a new edge is added by reading HTTP REFERER. A toy
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98 example, no longer "live", is at http://k0s.org/map.svg . This gives
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99 both the webmaster and visitors to see how the site is traveled: the
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100 well worn routes as well as the dusty trails. Note that the map
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101 itself is an element on the map :) In addition, the map could be
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102 embedded as a navigation aid on any page that desires it. Obviously a
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103 lot more could be done here than is shown in the toy example: nodes
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104 could be collapsed into metanodes until expanded (that is
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105 /pictures/mission/capp.jpg and /pictures/mission/cowboy.jpg might just
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106 be /pictures/mission for the sake of easy navigation unless a user
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107 clicked in for closer detail), etc. The algorithm is really simple:
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108 - for each request (in middleware) read the path info and the HTTP
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109 referer
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110 - if this edge doesn't exist create it
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111 - if it does, add one to its count (and whatever other metadata you
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112 want....you have the whole request)
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113 - additionally, you need a handler to display this data
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114 Some sites do this though I rarely see it presented this way and even
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115 more rarely to the user.
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116 In addition, you can make the system federated. For instance, lets
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117 say foo.org and bar.org both have maps (presumedly noted as <link
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118 rel="" type=""> in their <HEAD>s). If there is traffic from foo to
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119 bar you can stitch these maps together at the points where they meet.
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120 You have a federated map of the web!
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121
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122 The map of one's journey. So the above is from the site's point of
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123 view. What about the user's point of view? It would be easy to make
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124 an addon that recorded your own map of how you traversed the web. You
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125 click on a link in any tab and, again, an edge is created (and
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126 populated with whatever metadata you want). You can see how you use
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127 the web as well as share your travels with friends. This could also
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128 link up with site maps when they are available.
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129
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130 Just some things I've been thinking of in the last two years. I'm
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131 happy to go into more detail or flush them out if there is interest.
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132
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133 https://groups.google.com/forum/?hl=en#!topic/mozilla-labs-pancake/TbRFpxvic6M
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134 http://play.fxhome.mozillalabs.com:4322/lattice/oyiptong@mozilla.com/graph/vis.html
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135
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136
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137 = Graph exchange formats =
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138
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139 [Planned] WSGraph should be able to import and export any of the
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140 standard graph formats
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142 * JSGN (native)
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143 * http://en.wikipedia.org/wiki/Graph_Modelling_Language
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144 * http://en.wikipedia.org/wiki/GraphML
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145 * http://en.wikipedia.org/wiki/Trivial_Graph_Format
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146 * http://www.gupro.de/GXL/ , http://en.wikipedia.org/wiki/GXL
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147 * http://en.wikipedia.org/wiki/Dot_language (Graphviz)
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148
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149
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150 = Resources =
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151
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152 Python packages related to graphs:
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153
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154 * graph-tool: http://en.wikipedia.org/wiki/Graph-tool ,
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155 https://pypi.python.org/pypi/graph-tool ,
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156 http://projects.skewed.de/graph-tool/
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157
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158 Javascript:
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159
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160 * http://arborjs.org/
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161
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162
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163 Other external libraries and tools:
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164
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165 * Graphviz: the old, the venerable, and still the king
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166 * tulip: http://tulip.labri.fr/TulipDrupal/
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167 * GUESS: http://graphexploration.cond.org/
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168 * Java Universal Network/Graph Framework : http://jung.sourceforge.net/
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169 * graphthing http://graph.seul.org/
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170 * igraph http://igraph.sourceforge.net/
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171 * blockdiag: imple diagram images generator; http://blockdiag.com/
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172 * graphthing: http://graph.seul.org/
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173
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174 Let's not forget
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175 * ganv: Ganv is an interactive Gtk canvas widget for graph-based
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176 interfaces;
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177 http://dev.drobilla.net/browser/trunk/ganv (though see also
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178 http://packages.ubuntu.com/source/quantal/libs/ganv and
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179 http://harryhaaren.blogspot.com/2012/12/getting-to-grips-with-flowcanvas.html
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180 )
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181
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182
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183 See also http://k0s.org/links/?q=graph
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184
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185 (And what is
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186 https://github.com/tinkerpop/blueprints/wiki/GraphML-Reader-and-Writer-Library ?)
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187
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188 Parallel Efforts
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189 ----------------
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190
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191 * http://k0s.org/hg/IntentMadeManifest/
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192
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193
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194 TODO
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195 ----
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196
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197 * a tool to take graphml embedded in a webpage (or other suitable
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198 format) and generate a graph in the chosen form (e.g. <img
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199 src="_generated_graph.png"/> or whatevr we can hammer into HTML
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200
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201 ----
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202
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203 Jeff Hammel
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204
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205 http://k0s.org/hg/WSGraph
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206