<arc>

<arc> (arc) 標記一條弧線，即為圖形中節點與節點之間的連線。 [19.1 Graphs and Digraphs]
組件 nets — Graphs, Networks, and Trees
屬性 att.global (@xml:id, @n, @xml:lang, @xml:base, @xml:space) (att.global.rendition (@rend, @style, @rendition)) (att.global.linking (@corresp, @synch, @sameAs, @copyOf, @next, @prev, @exclude, @select)) (att.global.analytic (@ana)) (att.global.facs (@facs)) (att.global.change (@change)) (att.global.responsibility (@cert, @resp)) (att.global.source (@source))
from⚓︎ 相鄰自該線邊的節點的識別符碼。
狀態 必備的
資料類型 teidata.pointer
to⚓︎ 相鄰至該線邊的節點的識別符碼。
狀態 必備的
資料類型 teidata.pointer
可包含在於
nets: graph
可包含
core: label
註

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.

Zero, one, or two children label elements may be present. The first occurence of label provides a label for the arc; the second provides a second label for the arc, and should be used if a transducer is being encoded.
例子
<arc from="#zh-tw_T3" to="#zh-tw_T3">
 <label>OLD</label>
 <label>年老</label>
</arc>
Content model 
<content>
 <sequence minOccurs="0">
  <elementRef key="label"/>
  <elementRef key="label" minOccurs="0"/>
 </sequence>
</content>
宣告 
<rng:element name="arc">
 <rng:ref name="att.global.attributes"/>
 <rng:ref name="att.global.rendition.attributes"/>
 <rng:ref name="att.global.linking.attributes"/>
 <rng:ref name="att.global.analytic.attributes"/>
 <rng:ref name="att.global.facs.attributes"/>
 <rng:ref name="att.global.change.attributes"/>
 <rng:ref name="att.global.responsibility.attributes"/>
 <rng:ref name="att.global.source.attributes"/>
 <rng:attribute name="from">
  <rng:ref name="teidata.pointer"/>
 </rng:attribute>
 <rng:attribute name="to">
  <rng:ref name="teidata.pointer"/>
 </rng:attribute>
 <rng:optional>
  <rng:group>
   <rng:ref name="label"/>
   <rng:optional>
    <rng:ref name="label"/>
   </rng:optional>
  </rng:group>
 </rng:optional>
</rng:element>
element arc
{
   att.global.attributes,
   att.global.rendition.attributes,
   att.global.linking.attributes,
   att.global.analytic.attributes,
   att.global.facs.attributes,
   att.global.change.attributes,
   att.global.responsibility.attributes,
   att.global.source.attributes,
   attribute from { teidata.pointer },
   attribute to { teidata.pointer },
   ( label, label? )?
}