<lem>

<lem> (lemma) 異なるテキストにおける対象語，すなわち基底テキスト(base text)を示す． [12.1 The Apparatus Entry, Readings, and Witnesses]
モジュール textcrit — Critical Apparatus
属性 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.textCritical (@type, @cause, @varSeq, @require) (att.written (@hand)) att.witnessed (@wit)
上位
textcrit: app rdgGrp
下位
analysis: c cl interp interpGrp m pc phr s span spanGrp w
certainty: certainty precision respons
core: abbr add address bibl biblStruct binaryObject cb choice cit corr date del desc distinct ellipsis email emph expan foreign gap gb gloss graphic hi index l label lb lg list listBibl measure measureGrp media mentioned milestone name note noteGrp num orig p pb ptr q quote ref reg rs ruby said sic soCalled sp stage term time title unclear unit
dictionaries: lang oRef pRef
drama: camera caption castList epilogue move performance prologue set sound spGrp tech view
figures: figure formula notatedMusic table
gaiji: g
header: biblFull idno
iso-fs: fLib fs fvLib
linking: ab alt altGrp anchor join joinGrp link linkGrp seg timeline
msdescription: catchwords depth dim dimensions height heraldry locus locusGrp material msDesc objectType origDate origPlace secFol signatures stamp watermark width
namesdates: addName affiliation bloc climate country district forename genName geo geogFeat geogName listEvent listNym listObject listOrg listPerson listPlace listRelation location nameLink objectName offset orgName persName persPronouns placeName population region roleName settlement state surname terrain trait
nets: eTree forest graph listForest tree
spoken: annotationBlock incident kinesic pause shift u vocal writing
tagdocs: att classSpec code constraintSpec dataSpec eg egXML elementSpec gi ident listRef macroSpec moduleSpec outputRendition specDesc specGrp specGrpRef specList tag val
textcrit: app lacunaEnd lacunaStart listApp listWit wit witDetail witEnd witStart
textstructure: argument byline div docAuthor docDate docEdition docImprint docTitle epigraph floatingText imprimatur titlePage titlePart
transcr: addSpan am damage damageSpan delSpan ex fw handShift listTranspose metamark mod redo restore retrace secl space subst substJoin supplied surplus undo
verse: caesura rhyme
character data
解説

校勘学において用語「lemma」は，テキスト中の解釈を指すものとして使 われる(現存資料中の解釈とは異なる)．これは，数学上の意味(証明過程 中のいち段階)とは異なっている．また，自然言語処理上の意味(本文中の 屈折形と関連する，辞書中の項目)とも異なる．

例
<app>
 <lem wit="#El #Hg">Experience</lem>
 <rdg wit="#La" type="substantive">Experiment</rdg>
 <rdg wit="#Ra2" type="substantive">Eryment</rdg>
</app>
Content model 
<content>
 <alternate minOccurs="0"
  maxOccurs="unbounded">
  <textNode/>
  <classRef key="model.divLike"/>
  <classRef key="model.divPart"/>
  <elementRef key="titlePage"/>
  <elementRef key="argument"/>
  <elementRef key="byline"/>
  <elementRef key="docAuthor"/>
  <elementRef key="docDate"/>
  <elementRef key="docEdition"/>
  <elementRef key="docImprint"/>
  <elementRef key="docTitle"/>
  <elementRef key="epigraph"/>
  <elementRef key="imprimatur"/>
  <elementRef key="titlePart"/>
  <elementRef key="epilogue"/>
  <elementRef key="performance"/>
  <elementRef key="prologue"/>
  <elementRef key="set"/>
  <classRef key="model.gLike"/>
  <classRef key="model.phrase"/>
  <classRef key="model.inter"/>
  <classRef key="model.global"/>
  <classRef key="model.rdgPart"/>
 </alternate>
</content>
宣言 
<rng:element name="lem">
 <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.textCritical.attributes"/>
 <rng:ref name="att.written.attributes"/>
 <rng:ref name="att.witnessed.attributes"/>
 <rng:zeroOrMore>
  <rng:choice>
   <rng:text/>
   <rng:ref name="model.divLike"/>
   <rng:ref name="model.divPart"/>
   <rng:ref name="titlePage"/>
   <rng:ref name="argument"/>
   <rng:ref name="byline"/>
   <rng:ref name="docAuthor"/>
   <rng:ref name="docDate"/>
   <rng:ref name="docEdition"/>
   <rng:ref name="docImprint"/>
   <rng:ref name="docTitle"/>
   <rng:ref name="epigraph"/>
   <rng:ref name="imprimatur"/>
   <rng:ref name="titlePart"/>
   <rng:ref name="epilogue"/>
   <rng:ref name="performance"/>
   <rng:ref name="prologue"/>
   <rng:ref name="set"/>
   <rng:ref name="model.gLike"/>
   <rng:ref name="model.phrase"/>
   <rng:ref name="model.inter"/>
   <rng:ref name="model.global"/>
   <rng:ref name="model.rdgPart"/>
  </rng:choice>
 </rng:zeroOrMore>
</rng:element>
element lem
{
   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.textCritical.attributes,
   att.written.attributes,
   att.witnessed.attributes,
   (
      text
    | model.divLike
    | model.divPart
    | titlePage
    | argument
    | byline
    | docAuthor
    | docDate
    | docEdition
    | docImprint
    | docTitle
    | epigraph
    | imprimatur
    | titlePart
    | epilogue
    | performance
    | prologue
    | set
    | model.gLike
    | model.phrase
    | model.inter
    | model.global
    | model.rdgPart
   )*
}