<lem>

<lem> (主題) 包含一個原文變異的主題或基礎文件。 [12.1 The Apparatus Entry, Readings, and Witnesses]
組件 textcrit — Critical Apparatus
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.textCritical (@type, @cause, @varSeq, @require) (att.written (@hand)) att.witnessed (@wit)
可包含在於
textcrit: app rdgGrp
可包含
dictionaries: lang oRef pRef
gaiji: g
header: biblFull idno
iso-fs: fLib fs fvLib
verse: caesura rhyme
character data

The term lemma is used in text criticism to describe the reading given in the main text, which may be used as a heading in the apparatus itself. This usage connects it to mathematics (where a lemma is a proven proposition used as a step in a proof, a "given") and natural-language processing (where a lemma is the dictionary headword associated with an inflected form in the running text).

例子
<app>
 <lem wit="#El #Hg">Experience</lem>
 <rdg wit="#Latype="substantive">Experiment</rdg>
 <rdg wit="#Ra2type="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>
宣告
<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.divLikemodel.divParttitlePageargumentbylinedocAuthordocDatedocEditiondocImprintdocTitleepigraphimprimaturtitlePartepilogueperformanceprologuesetmodel.gLikemodel.phrasemodel.intermodel.globalmodel.rdgPart
   )*
}