`<graph>` | encodes a graph, which is a collection of nodes, and arcs which connect the nodes.
Attributes: |
`type` | describes the type of graph.
| Datatype: CDATA
| Legal values: |
`undirected` | undirected graph
`directed` | directed graph
`transition network` | a directed graph with distinguished initial and final nodes
`transducer` | a transition network with up to two labels on each arc
| Default: #IMPLIED
Note | If `type=undirected` , then the distinction between the `to` and `from` attributes of the `<arc>` tag is neutralized. Also, the `adj` attribute, rather than the `adjFrom` and `adjTo` attributes, should be used to encode pointers to the ends of the arcs. If `type=directed` (or any other value which implies directionality), then the `adjFrom` and `adjTo` attributes should be used, instead of the `adj` attribute.
`label` | gives a label for a graph.
| Datatype: CDATA
| Values: A character string.
| Default: #IMPLIED
`order` | states the order of the graph, i.e., the number of its nodes.
| Datatype: NUMBER
| Values: A positive integer.
| Default: #IMPLIED
`size` | states the size of the graph, i.e., the number of its arcs.
| Datatype: NUMBER
| Values: A nonnegative integer.
| Default: #IMPLIED

Example

    <graph type=undirected
           id=cug1
           label='Airline Connections in Southwestern USA'
           rend='LABEL-PLACE bottom center NODE-FRAME none ARC solid line'
           order=5
           size=4>
      <node label=LAX id=LAX degree=2>
      <node label=LVG id=LVG degree=2>
      <node label=PHX id=PHX degree=3>
      <node label=TUS id=TUS degree=1>
      <node label=CIB id=CIB degree=0>
      <arc  from=LAX to=LVG>
      <arc  from=LAX to=PHX>
      <arc  from=LVG to=PHX>
      <arc  from=PHX to=TUS>
      </graph>

Example

    <graph type=directed
           id=rdg2
           label='Selected Airline Routes in Southwestern USA'
           rend='LABEL-PLACE bottom center NODE-FRAME none ARC solid line
    with arrowhead'
           order=5
           size=5>
       <node label=LAX id=LAX inDegree=1 outDegree=1 adjTo=LVG adjFrom=PHX>
       <node label=LVG id=LVG inDegree=1 outDegree=1 adjFrom=LAX adjTo=PHX>
       <node label=PHX id=PHX inDegree=2 outDegree=2 adjTo='LAX TUS'
             adjFrom='LVG TUS'>
       <node label=TUS id=TUS inDegree=1 outDegree=1 adjTo=PHX adjFrom=PHX>
       <node label=CIB id=CIB inDegree=0 outDegree=0>
       </graph>

Tagset additional tag set for graphs, networks, and trees
Class chunk [and indirectly also:] common
Filename `teinet2`
Content: One or more nodes and zero or more arcs in any order.
Parents add argument body castList corr div div0 div1 div2 div3 div4 div5 div6 div7 epigraph epilogue equiv item metDecl note performance prologue q quote remarks set sic stage view
Children arc node
Declaration

    <!ELEMENT graph         - -  ((node+, arc*) | (arc*, node+))    >
    <!ATTLIST graph              %a.global
              type               CDATA               #IMPLIED
              label              CDATA               #IMPLIED
              order              NUMBER              #IMPLIED
              size               NUMBER              #IMPLIED       >

See 21.1

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