## Text Encoding Initiative

### The XML Version of the TEI Guidelines

# <graph>

`<graph>` | encodes a graph, which is a collection of nodes, and arcs which connect the nodes.

Attributes

(In addition to global attributes and those inherited from chunk)

`type` | describes the type of graph.
| Datatype: CDATA

Suggested values include:

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: CDATA
| Values: A positive integer.
| Default: #IMPLIED
`size` | states the size of the graph, i.e., the number of its arcs.
| Datatype: CDATA
| Values: A non-negative integer.
| Default: #IMPLIED

Example

    <graph id="cug1"
      rend="LABEL-PLACE bottom center NODE-FRAME none  ARC solid line"
      type="undirected" label="Airline Connections in Southwestern USA"
      order="5" size="4">
       <node id="lax" label="LAX" degree="2"/>
       <node id="lvg" label="LVG" degree="2"/>
       <node id="phx" label="PHX" degree="3"/>
       <node id="tus" label="TUS" degree="1"/>
       <node id="cib" label="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 id="rdg2"
      rend="LABEL-PLACE bottom center NODE-FRAME none   ARC solid line with arrowhead"
      type="directed" label="Selected Airline Routes in Southwestern USA"
      order="5" size="5">
       <node id="lax" label="LAX" adjTo="lvg" adjFrom="phx" inDegree="1" outDegree="1"/>
       <node id="lvg" label="LVG" adjTo="phx" adjFrom="lax" inDegree="1" outDegree="1"/>
       <node id="phx" label="PHX" adjTo="lax tus" adjFrom="lvg tus" inDegree="2" outDegree="2"/>
       <node id="tus" label="TUS" adjTo="phx" adjFrom="phx" inDegree="1" outDegree="1"/>
       <node id="cib" label="CIB" inDegree="0" outDegree="0"/>
    </graph>

Module Declared in file teinet2; Additional tag set for Graph Theory: enabled by TEI.nets
Class chunk
Data Description One or more nodes and zero or more arcs in any order.
May contain addSpan alt altGrp anchor arc cb certainty delSpan fLib fs fsLib fvLib fw gap index interp interpGrp join joinGrp lb link linkGrp milestone node pb respons span spanGrp timeline
May occur within add argument body castList corr div div0 div1 div2 div3 div4 div5 div6 div7 epigraph epilogue item metDecl note performance prologue q quote set sic stage view
Declaration

    <!ELEMENT graph %om.RR; (  (( node, (%m.Incl;)* )+, ( arc,  (%m.Incl;)* )*)
                       | (( arc,  (%m.Incl;)* )+, ( node, (%m.Incl;)* )+)) >
    <!ATTLIST graph
          %a.global;
          type CDATA #IMPLIED
          label CDATA #IMPLIED
          order CDATA #IMPLIED
          size CDATA #IMPLIED>

See further 21.1 Graphs and Digraphs

Up: 35 Elements