<opener>

<opener> 구역, 특히 편지의 시작부에 서문군으로 나타나는 날짜 표시란, 필자명 행, 인사말, 그리고 유사 구를 합하여 모아 놓는다. [4.2 Elements Common to All Divisions]
모듈textstructure — 4 Default Text Structure
속성att.global (@xml:id, @n, @xml:lang, @rend, @style, @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))
에 의해 사용된
에 의해 포함된
포함할 수 있다
선언

<rng:element name="opener">
 <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:zeroOrMore>
  <rng:choice>
   <rng:text/>
   <rng:ref name="model.gLike"/>
   <rng:ref name="model.phrase"/>
   <rng:ref name="argument"/>
   <rng:ref name="byline"/>
   <rng:ref name="dateline"/>
   <rng:ref name="epigraph"/>
   <rng:ref name="salute"/>
   <rng:ref name="signed"/>
   <rng:ref name="model.global"/>
  </rng:choice>
 </rng:zeroOrMore>
</rng:element>
element opener
{
   att.global.attributes,
   att.global.linking.attributes,
   att.global.analytic.attributes,
   att.global.facs.attributes,
   att.global.change.attributes,
   (
      text
    | model.gLikemodel.phraseargumentbylinedatelineepigraphsalutesignedmodel.global
   )*
}
<opener>
 <dateline>Walden, this 29. of August 1592</dateline>
</opener>
<opener>
 <dateline>
  <name type="place">Great Marlborough Street</name>
  <date>November 11, 1848</date>
 </dateline>
 <salute>My dear Sir,</salute>
</opener>
<p>I am sorry to say that absence from town and other circumstances have prevented me from
earlier enquiring...</p>