<arc> encodes an arc, the connection from one node to another in a graph.
Attributes:
label gives a label for an arc.
Datatype: CDATA
Values: A character string.
Default: #IMPLIED
label2 gives a second label for an arc.
Datatype: CDATA
Values: A character string.
Default: #IMPLIED
Note

Use this attribute together with the label attribute if a transducer is being encoded.

from gives the ID of the node which is adjacent from this arc.
Datatype: IDREF
Values: The ID of a node.
Default: #REQUIRED
to gives the ID of the node which is adjacent to this arc.
Datatype: IDREF
Values: The ID of a node.
Default: #REQUIRED
Example 
<arc from=t3 to=t3 label='OLD' label2='VIEUX'>
Note

The <arc> element must be used if the arcs are labeled. Otherwise, arcs can be encoded using the adj , adjTo and adjFrom attributes on the <node> tags in the graph. Both <arc> tags and adjacency attributes can be used, but the resulting encoding would be highly redundant.

Tagsetadditional tag set for graphs, networks, and trees
Class
Filenameteinet2
Content: empty
Parentsgraph
Children[none]
Declaration
<!ELEMENT arc           - O  EMPTY                              >
<!ATTLIST arc                %a.global
          label              CDATA               #IMPLIED
          label2             CDATA               #IMPLIED
          from               IDREF               #REQUIRED
          to                 IDREF               #REQUIRED      >
See 21.1

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