<ex>

<ex> (editorial expansion) contains a sequence of letters added by an editor or transcriber when expanding an abbreviation. [11.3.1.2. Abbreviation and Expansion]
Moduletranscr
AttributesAttributes 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.editLike (@evidence, @instant) att.dimensions (@precision, @unit, @quantity, @extent, @scope) (att.ranging (@atLeast, @atMost, @min, @max, @confidence))
Member of
Contained by
analysis: pc w
dictionaries: form
msdescription: origDate
textcrit: lem rdg
textstructure: dateline docImprint
May contain
gaiji: g
Declaration
element ex
{
   tei_att.global.attributes,
   tei_att.editLike.attributes,
   tei_att.dimensions.attributes,
   tei_macro.xtext
}
Schematron

<sch:rule context="tei:ex">
<sch:report test="not(ancestor::tei:expan)">ex should only appear inside expan</sch:report>
<sch:report test="parent::tei:abbr">ex should not be a child of abbr</sch:report></sch:rule>
Example
The address is Southmoor <choice>
 <expan>R<ex>oa</ex>d</expan>
 <abbr>Rd</abbr>
</choice>