<catRef>

<catRef> (類目參照) 標明在某分類法或文件類型學中，一個或多個已定義之類目。 [2.4.3 The Text Classification]
組件 header — The TEI Header
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)) att.pointing (@targetLang, @target, @evaluate)
scheme⚓ 標明該分類架構，其中相關的類目群組已被定義
狀態 非必備的
資料類型 teidata.pointer
可包含在於
core: imprint
header: textClass
可包含 空白元素
註

The scheme attribute needs to be supplied only if more than one taxonomy has been declared.
例子
<catRef target="#zh-tw_news #zh-tw_prov #zh-tw_sales2"/>
<!-- elsewhere -->
<taxonomy>
 <category xml:id="zh-tw_news">
  <catDesc>報紙</catDesc>
 </category>
 <category xml:id="zh-tw_prov">
  <catDesc>全省的</catDesc>
 </category>
 <category xml:id="zh-tw_sales2">
  <catDesc>低於每年平均銷售額</catDesc>
 </category>
</taxonomy>
Content model 
<content>
 <empty/>
</content>
宣告 
<rng:element name="catRef">
 <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:ref name="att.pointing.attributes"/>
 <rng:optional>
  <rng:attribute name="scheme">
   <rng:ref name="teidata.pointer"/>
  </rng:attribute>
 </rng:optional>
 <rng:empty/>
</rng:element>
element catRef
{
   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,
   att.pointing.attributes,
   attribute scheme { teidata.pointer }?,
   empty
}