<alt>

<alt> (alternation) identifies an alternation or a set of choices among elements or passages. [16.8 Alternation]
Modulelinking — 16 Linking, Segmentation, and Alignment
Attributesatt.global (@xml:id, @n, @xml:lang, @rend, @rendition, @xml:base, @xml:space) (att.global.linking (@corresp, @synch, @sameAs, @copyOf, @next, @prev, @exclude, @select)) (att.global.analytic (@ana)) (att.global.facs (@facs)) (att.global.change (@change)) att.pointing (@target, @evaluate) att.typed (@type, @subtype)
targetsspecifies the identifiers of the alternative elements or passages.
Status Optional
Datatype 2–∞ occurrences of 

<rng:ref name="data.pointer"/>
data.pointer
separated by whitespace
Values Each value specified must be the same as that specified as value for an xml:id attribute for some other element in the current document.
Note
This attribute is deprecated. It is retained for backward compatibility only; the attribute target should be used for preference. It is an error to supply both attributes, but one or the other must be present.
modestates whether the alternations gathered in this collection are exclusive or inclusive.
Status Recommended
Legal values are:
excl
(exclusive) indicates that the alternation is exclusive, i.e. that at most one of the alternatives occurs.
incl
(inclusive) indicates that the alternation is not exclusive, i.e. that one or more of the alternatives occur.
weightsIf mode is excl, each weight states the probability that the corresponding alternative occurs. If mode is incl each weight states the probability that the corresponding alternative occurs given that at least one of the other alternatives occurs.
Status Optional
Datatype 2–∞ occurrences of 

<rng:ref name="data.probability"/>
data.probability
separated by whitespace
Values a whitespace-separated list of probability values in the range from 0 to 1.
Note
If mode is excl, the sum of weights must be 1. If mode is incl, the sum of weights must be in the range from 0 to the number of alternants.
Used by
model.global.meta
Contained by
analysis: cl m phr s span w
core: abbr add addrLine address author bibl biblScope cit 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 geogName langKnown nameLink nationality occupation orgName persName person placeName region residence roleName settlement sex socecStatus surname
nets: graph
spoken: u writing
tagdocs: 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 sourceDoc supplied surface surfaceGrp surplus zone
verse: metSym rhyme
May containEmpty element
Declaration

<rng:element name="alt">
 <rng:ref name="att.global.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.pointing.attributes"/>
 <rng:ref name="att.typed.attributes"/>
 <rng:optional>
  <rng:attribute name="targets">
   <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">
   <rng:choice>
    <rng:value>excl</rng:value>
    <rng:value>incl</rng:value>
   </rng:choice>
  </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.linking.attributes,
   att.global.analytic.attributes,
   att.global.facs.attributes,
   att.global.change.attributes,
   att.pointing.attributes,
   att.typed.attributes,
   attribute targets { list { data.pointer, data.pointer, data.pointer* } }?,
   attribute mode { "excl" | "incl" }?,
   attribute weights
   {
      list { data.probability, data.probability, data.probability* }
   }?,
   empty
}
Schematron

<s:report test="@target and @targets">You may not supply both
@target and @targets</s:report>
Schematron

<s:report test="not(@target) and not(@targets)">You must
supply either @target or @targets</s:report>
Schematron

<s:assert test="contains(@target,' ')">You must supply at least two
values for @target</s:assert>
Example
<alt mode="excl" target="#we.fun #we.sun" weights="0.5 0.5"/>