<alt>

<alt> (替換) 標明一個替換，或是元素或段落之間的一組不同選擇。 [16.8 Alternation]
組件linking — Linking, Segmentation, and Alignment
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.typed (@type, @subtype) att.pointing (target, @targetLang, @evaluate)
target用一個或多個統一資源識別符參照 (URI References) 來說明參照所指位置。
Derived fromatt.pointing
狀態 非必備的
資料類型 2–∞ 次可出現: 

<rng:ref name="data.pointer"/>
data.pointer
以空白鍵隔開
mode說明在此集合中的替換物件是唯一的或通用的。
狀態 推薦的
資料類型 

<rng:ref name="data.enumerated"/>
data.enumerated
合法的值是:
excl
(exclusive) 替換物件是唯一的，例如最多只出現一個替換。
incl
(inclusive) 替換物件不是唯一的，例如出現一個或多個替換。
weights若屬性mode的屬性值是excl，則每個weight皆表明相對應替換的可能性。若屬性mode的屬性值是incl，則每個weight皆表明，在至少一個其他替換存在的前提下，相對應替換的可能性
狀態 非必備的
資料類型 2–∞ 次可出現: 

<rng:ref name="data.probability"/>
data.probability
以空白鍵隔開
俱乐部会员
model.global.meta
可包含在於
analysis: cl m phr s span w
core: abbr add addrLine address author bibl biblScope cit citedRange corr date del distinct editor email emph expan foreign gloss head headItem headLabel hi imprint item l label lg list measure mentioned name note num orig p pubPlace publisher q quote ref reg resp rs said series sic soCalled sp speaker stage street term textLang time title unclear
corpus: activity channel constitution derivation domain factuality interaction locale preparedness purpose
dictionaries: case colloc def dictScrap entry entryFree etym form gen gram gramGrp hom hyph iType lang lbl mood number orth per pos pron re sense stress subc syll tns usg xr
drama: actor camera caption castGroup castItem castList epilogue performance prologue role roleDesc set sound spGrp tech view
figures: cell figure table
header: authority change classCode distributor edition extent funder geoDecl handNote language licence principal scriptNote sponsor typeNote
linking: ab altGrp seg
msdescription: accMat acquisition additions catchwords collation colophon condition custEvent decoNote explicit filiation finalRubric foliation heraldry incipit layout material msItem musicNotation objectType origDate origPlace origin provenance rubric secFol signatures source stamp summary support surrogates watermark
namesdates: addName affiliation age birth bloc country death district education faith floruit forename genName geogFeat geogName langKnown nameLink nationality occupation offset orgName persName person personGrp placeName region residence roleName settlement sex socecStatus surname
nets: graph
spoken: u writing
tagdocs: eg valDesc
textcrit: app lem rdg wit witDetail
textstructure: argument back body byline closer dateline div div1 div2 div3 div4 div5 div6 div7 docAuthor docDate docEdition docImprint docTitle epigraph floatingText front group imprimatur opener postscript salute signed text titlePage titlePart trailer
transcr: damage fw line metamark mod restore retrace secl sourceDoc supplied surface surfaceGrp surplus zone
verse: metSym rhyme
可包含空白元素
宣告

<rng:element name="alt">
 <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.typed.attributes"/>
 <rng:ref name="att.pointing.attribute.targetLang"/>
 <rng:ref name="att.pointing.attribute.evaluate"/>
 <rng:optional>
  <rng:attribute name="target">
   <rng:list>
    <rng:ref name="data.pointer"/>
    <rng:ref name="data.pointer"/>
    <rng:zeroOrMore>
     <rng:ref name="data.pointer"/>
    </rng:zeroOrMore>
   </rng:list>
  </rng:attribute>
 </rng:optional>
 <rng:optional>
  <rng:attribute name="mode">
   <xhtml:dl class="valList"/>
  </rng:attribute>
 </rng:optional>
 <rng:optional>
  <rng:attribute name="weights">
   <rng:list>
    <rng:ref name="data.probability"/>
    <rng:ref name="data.probability"/>
    <rng:zeroOrMore>
     <rng:ref name="data.probability"/>
    </rng:zeroOrMore>
   </rng:list>
  </rng:attribute>
 </rng:optional>
 <rng:empty/>
</rng:element>
element alt
{
   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.typed.attributes,
   att.pointing.attribute.targetLang,
   att.pointing.attribute.evaluate,
   attribute target { list { data.pointer, data.pointer, data.pointer* } }?,
   attribute mode { text }?,
   attribute weights
   {
      list { data.probability, data.probability, data.probability* }
   }?,
   empty
}
例子
<alt mode="excl" target="#we.fun #we.sun"
 weights="0.5 0.5"/>