<div4>

<div4> (level-4 text division) contains a fourth-level subdivision of the front, body, or back of a text. [4.1.2 Numbered Divisions]
Module textstructure — Default Text Structure
Attributes
Member of
model.div4Like
Contained by
textstructure: div3
May contain
analysis: interp interpGrp span spanGrp
certainty: certainty precision respons
core: bibl biblStruct cb cit desc divGen ellipsis gap gb head index l label lb lg list listBibl meeting milestone note noteGrp p pb q quote said sp stage
dictionaries: entry entryFree superEntry
drama: camera caption castList move sound spGrp tech view
figures: figure notatedMusic table
header: biblFull
iso-fs: fLib fs fvLib
linking: ab alt altGrp anchor join joinGrp link linkGrp timeline
msdescription: msDesc
namesdates: listEvent listNym listObject listOrg listPerson listPlace listRelation
nets: eTree forest graph listForest tree
spoken: annotationBlock incident kinesic pause shift u vocal writing
tagdocs: classSpec constraintSpec dataSpec eg egXML elementSpec macroSpec moduleSpec outputRendition schemaSpec specGrp specGrpRef
textcrit: app listApp listWit witDetail
textstructure: argument byline closer dateline div5 docAuthor docDate epigraph floatingText opener postscript salute signed trailer
transcr: addSpan damageSpan delSpan fw listTranspose metamark space substJoin
Note

any sequence of low-level structural elements, possibly grouped into lower subdivisions.
Example
<div3 n="2.2.1" type="member">
 <head>Sect. II. Memb. I</head>
 <div4 n="2.2.1.1" type="subsection">
  <head>Subsect I. — Dyet rectified in substance.</head>
  <p>Diet, <term xml:lang="grc">diaitotiku</term>, <term xml:lang="la">victus</term> or
     living </p>
 </div4>
 <div4 n="2.2.2.1" type="subsection">
  <head>Subsect II. — Dyet rectified in quantity.</head>
  <p>Man alone, saith Cardan, eates and drinks without appetite, and useth all his pleasures
     without necessity </p>
 </div4>
</div3>
Content model 
<content>
 <sequence>
  <alternate minOccurs="0"
   maxOccurs="unbounded">
   <classRef key="model.divTop"/>
   <classRef key="model.global"/>
  </alternate>
  <sequence minOccurs="0">
   <alternate>
    <sequence minOccurs="1"
     maxOccurs="unbounded">
     <alternate>
      <classRef key="model.div5Like"/>
      <classRef key="model.divGenLike"/>
     </alternate>
     <classRef key="model.global"
      minOccurs="0" maxOccurs="unbounded"/>
    </sequence>
    <sequence>
     <sequence minOccurs="1"
      maxOccurs="unbounded">
      <alternate minOccurs="1"
       maxOccurs="1">
       <elementRef key="schemaSpec"/>
       <classRef key="model.common"/>
      </alternate>
      <classRef key="model.global"
       minOccurs="0" maxOccurs="unbounded"/>
     </sequence>
     <sequence minOccurs="0"
      maxOccurs="unbounded">
      <alternate>
       <classRef key="model.div5Like"/>
       <classRef key="model.divGenLike"/>
      </alternate>
      <classRef key="model.global"
       minOccurs="0" maxOccurs="unbounded"/>
     </sequence>
    </sequence>
   </alternate>
   <sequence minOccurs="0"
    maxOccurs="unbounded">
    <classRef key="model.divBottom"/>
    <classRef key="model.global"
     minOccurs="0" maxOccurs="unbounded"/>
   </sequence>
  </sequence>
 </sequence>
</content>
Schema Declaration 
<rng:element name="div4">
 <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.divLike.attributes"/>
 <rng:ref name="att.metrical.attributes"/>
 <rng:ref name="att.fragmentable.attributes"/>
 <rng:ref name="att.typed.attributes"/>
 <rng:ref name="att.declaring.attributes"/>
 <rng:group>
  <rng:zeroOrMore>
   <rng:choice>
    <rng:ref name="model.divTop"/>
    <rng:ref name="model.global"/>
   </rng:choice>
  </rng:zeroOrMore>
  <rng:optional>
   <rng:group>
    <rng:choice>
     <rng:oneOrMore>
      <rng:group>
       <rng:choice>
        <rng:ref name="model.div5Like"/>
        <rng:ref name="model.divGenLike"/>
       </rng:choice>
       <rng:zeroOrMore>
        <rng:ref name="model.global"/>
       </rng:zeroOrMore>
      </rng:group>
     </rng:oneOrMore>
     <rng:group>
      <rng:oneOrMore>
       <rng:group>
        <rng:choice>
         <rng:ref name="schemaSpec"/>
         <rng:ref name="model.common"/>
        </rng:choice>
        <rng:zeroOrMore>
         <rng:ref name="model.global"/>
        </rng:zeroOrMore>
       </rng:group>
      </rng:oneOrMore>
      <rng:zeroOrMore>
       <rng:group>
        <rng:choice>
         <rng:ref name="model.div5Like"/>
         <rng:ref name="model.divGenLike"/>
        </rng:choice>
        <rng:zeroOrMore>
         <rng:ref name="model.global"/>
        </rng:zeroOrMore>
       </rng:group>
      </rng:zeroOrMore>
     </rng:group>
    </rng:choice>
    <rng:zeroOrMore>
     <rng:group>
      <rng:ref name="model.divBottom"/>
      <rng:zeroOrMore>
       <rng:ref name="model.global"/>
      </rng:zeroOrMore>
     </rng:group>
    </rng:zeroOrMore>
   </rng:group>
  </rng:optional>
 </rng:group>
</rng:element>
element div4
{
   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.divLike.attributes,
   att.metrical.attributes,
   att.fragmentable.attributes,
   att.typed.attributes,
   att.declaring.attributes,
   (
      ( model.divTop | model.global )*,
      (
         (
            ( ( model.div5Like | model.divGenLike ), model.global* )+
          | (
               ( ( schemaSpec | model.common ), model.global* )+,
               ( ( model.div5Like | model.divGenLike ), model.global* )*
            )
         ),
         ( model.divBottom, model.global* )*
      )?
   )
}