<valDesc>

<valDesc> (value description) specifies any semantic or syntactic constraint on the value that an attribute may take, additional to the information carried by the datatype element. 22.4.5 Attribute List Specification
Module tagdocs — 22 Documentation Elements
In addition to global attributes att.translatable (@version)
mode specifies the effect of this declaration on its parent module.
Status Optional
Legal values are:
add
this declaration is added to the current definitions [Default]
delete
this declaration and all of its children are removed from the current setup
change
this declaration changes the declaration of the same name in the current definition
replace
this declaration replaces the declaration of the same name in the current definition
Used by
attDef
May contain
analysis: interp interpGrp span spanGrp
certainty: certainty precision respons
core: abbr address cb choice date distinct email emph expan foreign gap gloss index lb measure measureGrp mentioned milestone name note num pb ptr ref rs soCalled term time title
dictionaries: lang
figures: figure
iso-fs: fLib fs fvLib
linking: alt altGrp anchor join joinGrp link linkGrp timeline
msdescription: catchwords depth dim dimensions height heraldry locus locusGrp material origDate origPlace secFol signatures stamp watermark width
namesdates: addName affiliation bloc country district forename genName geo geogFeat geogName nameLink offset orgName persName placeName region roleName settlement state surname
spoken: incident kinesic pause shift vocal writing
tagdocs: att code gi ident tag val
textcrit: witDetail
transcr: addSpan am damageSpan delSpan ex fw handShift space subst
Declaration 

<rng:element name="valDesc">
 <rng:ref name="att.global.attributes"/>
 <rng:ref name="att.translatable.attributes"/>
 <rng:optional>
  <rng:attribute name="mode" a:defaultValue="add">
   <rng:choice>
    <rng:value>add</rng:value>
    <rng:value>delete</rng:value>
    <rng:value>change</rng:value>
    <rng:value>replace</rng:value>
   </rng:choice>
  </rng:attribute>
 </rng:optional>
 <rng:ref name="macro.phraseSeq.limited"/>
</rng:element>
element valDesc
{
   att.global.attributes,
   att.translatable.attributes,
   attribute mode { "add" | "delete" | "change" | "replace" }?,
   macro.phraseSeq.limited
}
Example
<valDesc>must point to another <gi>align</gi>
element logically preceding this one.</valDesc>