diff --git a/compiled-ODD/guidelines-de-wegaDocuments.compiled.xml b/compiled-ODD/guidelines-de-wegaDocuments.compiled.xml
index c8ed571..3236340 100644
--- a/compiled-ODD/guidelines-de-wegaDocuments.compiled.xml
+++ b/compiled-ODD/guidelines-de-wegaDocuments.compiled.xml
@@ -15283,7 +15283,11 @@ form in the running text).</p>
     </egXML>
   </exemplum><listRef>
     <ref target="https://www.tei-c.org/release/doc/tei-p5-doc/en/html/TC.html#TCAPLL">12.1. The Apparatus Entry, Readings, and Witnesses</ref>
-  </listRef></elementSpec><elementSpec rend="change" module="textcrit" ident="listWit"><gloss xmlns:tei="http://www.tei-c.org/ns/1.0" xmlns:mei="http://www.music-encoding.org/ns/mei" xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0" xmlns:s="http://www.ascc.net/xml/schematron" rend="replace" versionDate="2013-11-11" xml:lang="en">witness list</gloss><gloss xmlns:tei="http://www.tei-c.org/ns/1.0" xmlns:mei="http://www.music-encoding.org/ns/mei" xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0" xmlns:s="http://www.ascc.net/xml/schematron" rend="replace" versionDate="2013-11-11" xml:lang="de">Liste von Zeugen</gloss><desc xmlns:tei="http://www.tei-c.org/ns/1.0" xmlns:mei="http://www.music-encoding.org/ns/mei" xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0" xmlns:s="http://www.ascc.net/xml/schematron" rend="replace" versionDate="2013-11-11" xml:lang="en">lists definitions for all the witnesses referred to by a critical apparatus, optionally grouped hierarchically.</desc><desc xmlns:tei="http://www.tei-c.org/ns/1.0" xmlns:mei="http://www.music-encoding.org/ns/mei" xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0" xmlns:s="http://www.ascc.net/xml/schematron" rend="replace" versionDate="2013-11-11" xml:lang="de">listet Definitionen für alle Zeugen (wahlweise hierarchisch gruppiert), auf die ein kritischer Bericht verweist, auf.</desc><classes><memberOf key="model.listLike"/></classes><content><sequence minOccurs="1" maxOccurs="1"><classRef key="model.headLike" minOccurs="0"/><elementRef key="desc" minOccurs="0" maxOccurs="unbounded"/><alternate minOccurs="1" maxOccurs="unbounded"><elementRef key="witness"/><elementRef key="listWit"/></alternate></sequence></content><attList/><exemplum xml:lang="en">
+  </listRef></elementSpec><elementSpec rend="change" module="textcrit" ident="listWit"><gloss xmlns:tei="http://www.tei-c.org/ns/1.0" xmlns:mei="http://www.music-encoding.org/ns/mei" xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0" xmlns:s="http://www.ascc.net/xml/schematron" rend="replace" versionDate="2013-11-11" xml:lang="en">witness list</gloss><gloss xmlns:tei="http://www.tei-c.org/ns/1.0" xmlns:mei="http://www.music-encoding.org/ns/mei" xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0" xmlns:s="http://www.ascc.net/xml/schematron" rend="replace" versionDate="2013-11-11" xml:lang="de">Liste von Zeugen</gloss><desc xmlns:tei="http://www.tei-c.org/ns/1.0" xmlns:mei="http://www.music-encoding.org/ns/mei" xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0" xmlns:s="http://www.ascc.net/xml/schematron" rend="replace" versionDate="2013-11-11" xml:lang="en">lists definitions for all the witnesses referred to by a critical apparatus, optionally grouped hierarchically.</desc><desc xmlns:tei="http://www.tei-c.org/ns/1.0" xmlns:mei="http://www.music-encoding.org/ns/mei" xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0" xmlns:s="http://www.ascc.net/xml/schematron" rend="replace" versionDate="2013-11-11" xml:lang="de">listet Definitionen für alle Zeugen (wahlweise hierarchisch gruppiert), auf die ein kritischer Bericht verweist, auf.</desc><classes><memberOf key="model.listLike"/></classes><content><sequence minOccurs="1" maxOccurs="1"><classRef key="model.headLike" minOccurs="0"/><elementRef key="desc" minOccurs="0" maxOccurs="unbounded"/><alternate minOccurs="1" maxOccurs="unbounded"><elementRef key="witness"/><elementRef key="listWit"/></alternate></sequence></content><constraintSpec xmlns:tei="http://www.tei-c.org/ns/1.0" xmlns:mei="http://www.music-encoding.org/ns/mei" xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0" xmlns:s="http://www.ascc.net/xml/schematron" scheme="schematron" ident="only-one-witness">
+                <constraint>
+                    <sch:report test="count(tei:witness) le 1">There should always be more than one witness within a listWit element.</sch:report>
+                </constraint>
+            </constraintSpec><attList/><exemplum xml:lang="en">
     <egXML xmlns="http://www.tei-c.org/ns/Examples">
       <listWit>
         <witness xml:id="HL26">Ellesmere, Huntingdon Library 26.C.9</witness>
diff --git a/compiled-ODD/guidelines-de-wegaLetters.compiled.xml b/compiled-ODD/guidelines-de-wegaLetters.compiled.xml
index 810eed9..321d72b 100644
--- a/compiled-ODD/guidelines-de-wegaLetters.compiled.xml
+++ b/compiled-ODD/guidelines-de-wegaLetters.compiled.xml
@@ -16256,7 +16256,11 @@ form in the running text).</p>
     </egXML>
   </exemplum><listRef>
     <ref target="https://www.tei-c.org/release/doc/tei-p5-doc/en/html/TC.html#TCAPLL">12.1. The Apparatus Entry, Readings, and Witnesses</ref>
-  </listRef></elementSpec><elementSpec rend="change" module="textcrit" ident="listWit"><gloss xmlns:tei="http://www.tei-c.org/ns/1.0" xmlns:mei="http://www.music-encoding.org/ns/mei" xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0" xmlns:s="http://www.ascc.net/xml/schematron" rend="replace" versionDate="2013-11-11" xml:lang="en">witness list</gloss><gloss xmlns:tei="http://www.tei-c.org/ns/1.0" xmlns:mei="http://www.music-encoding.org/ns/mei" xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0" xmlns:s="http://www.ascc.net/xml/schematron" rend="replace" versionDate="2013-11-11" xml:lang="de">Liste von Zeugen</gloss><desc xmlns:tei="http://www.tei-c.org/ns/1.0" xmlns:mei="http://www.music-encoding.org/ns/mei" xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0" xmlns:s="http://www.ascc.net/xml/schematron" rend="replace" versionDate="2013-11-11" xml:lang="en">lists definitions for all the witnesses referred to by a critical apparatus, optionally grouped hierarchically.</desc><desc xmlns:tei="http://www.tei-c.org/ns/1.0" xmlns:mei="http://www.music-encoding.org/ns/mei" xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0" xmlns:s="http://www.ascc.net/xml/schematron" rend="replace" versionDate="2013-11-11" xml:lang="de">listet Definitionen für alle Zeugen (wahlweise hierarchisch gruppiert), auf die ein kritischer Bericht verweist, auf.</desc><classes><memberOf key="model.listLike"/></classes><content><sequence minOccurs="1" maxOccurs="1"><classRef key="model.headLike" minOccurs="0"/><elementRef key="desc" minOccurs="0" maxOccurs="unbounded"/><alternate minOccurs="1" maxOccurs="unbounded"><elementRef key="witness"/><elementRef key="listWit"/></alternate></sequence></content><attList/><exemplum xml:lang="en">
+  </listRef></elementSpec><elementSpec rend="change" module="textcrit" ident="listWit"><gloss xmlns:tei="http://www.tei-c.org/ns/1.0" xmlns:mei="http://www.music-encoding.org/ns/mei" xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0" xmlns:s="http://www.ascc.net/xml/schematron" rend="replace" versionDate="2013-11-11" xml:lang="en">witness list</gloss><gloss xmlns:tei="http://www.tei-c.org/ns/1.0" xmlns:mei="http://www.music-encoding.org/ns/mei" xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0" xmlns:s="http://www.ascc.net/xml/schematron" rend="replace" versionDate="2013-11-11" xml:lang="de">Liste von Zeugen</gloss><desc xmlns:tei="http://www.tei-c.org/ns/1.0" xmlns:mei="http://www.music-encoding.org/ns/mei" xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0" xmlns:s="http://www.ascc.net/xml/schematron" rend="replace" versionDate="2013-11-11" xml:lang="en">lists definitions for all the witnesses referred to by a critical apparatus, optionally grouped hierarchically.</desc><desc xmlns:tei="http://www.tei-c.org/ns/1.0" xmlns:mei="http://www.music-encoding.org/ns/mei" xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0" xmlns:s="http://www.ascc.net/xml/schematron" rend="replace" versionDate="2013-11-11" xml:lang="de">listet Definitionen für alle Zeugen (wahlweise hierarchisch gruppiert), auf die ein kritischer Bericht verweist, auf.</desc><classes><memberOf key="model.listLike"/></classes><content><sequence minOccurs="1" maxOccurs="1"><classRef key="model.headLike" minOccurs="0"/><elementRef key="desc" minOccurs="0" maxOccurs="unbounded"/><alternate minOccurs="1" maxOccurs="unbounded"><elementRef key="witness"/><elementRef key="listWit"/></alternate></sequence></content><constraintSpec xmlns:tei="http://www.tei-c.org/ns/1.0" xmlns:mei="http://www.music-encoding.org/ns/mei" xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0" xmlns:s="http://www.ascc.net/xml/schematron" scheme="schematron" ident="only-one-witness">
+                <constraint>
+                    <sch:report test="count(tei:witness) le 1">There should always be more than one witness within a listWit element.</sch:report>
+                </constraint>
+            </constraintSpec><attList/><exemplum xml:lang="en">
     <egXML xmlns="http://www.tei-c.org/ns/Examples">
       <listWit>
         <witness xml:id="HL26">Ellesmere, Huntingdon Library 26.C.9</witness>
diff --git a/compiled-ODD/guidelines-de-wegaWritings.compiled.xml b/compiled-ODD/guidelines-de-wegaWritings.compiled.xml
index 008c93c..a47c10d 100644
--- a/compiled-ODD/guidelines-de-wegaWritings.compiled.xml
+++ b/compiled-ODD/guidelines-de-wegaWritings.compiled.xml
@@ -15077,7 +15077,11 @@ form in the running text).</p>
     </egXML>
   </exemplum><listRef>
     <ref target="https://www.tei-c.org/release/doc/tei-p5-doc/en/html/TC.html#TCAPLL">12.1. The Apparatus Entry, Readings, and Witnesses</ref>
-  </listRef></elementSpec><elementSpec rend="change" module="textcrit" ident="listWit"><gloss xmlns:tei="http://www.tei-c.org/ns/1.0" xmlns:mei="http://www.music-encoding.org/ns/mei" xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0" xmlns:s="http://www.ascc.net/xml/schematron" rend="replace" versionDate="2013-11-11" xml:lang="en">witness list</gloss><gloss xmlns:tei="http://www.tei-c.org/ns/1.0" xmlns:mei="http://www.music-encoding.org/ns/mei" xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0" xmlns:s="http://www.ascc.net/xml/schematron" rend="replace" versionDate="2013-11-11" xml:lang="de">Liste von Zeugen</gloss><desc xmlns:tei="http://www.tei-c.org/ns/1.0" xmlns:mei="http://www.music-encoding.org/ns/mei" xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0" xmlns:s="http://www.ascc.net/xml/schematron" rend="replace" versionDate="2013-11-11" xml:lang="en">lists definitions for all the witnesses referred to by a critical apparatus, optionally grouped hierarchically.</desc><desc xmlns:tei="http://www.tei-c.org/ns/1.0" xmlns:mei="http://www.music-encoding.org/ns/mei" xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0" xmlns:s="http://www.ascc.net/xml/schematron" rend="replace" versionDate="2013-11-11" xml:lang="de">listet Definitionen für alle Zeugen (wahlweise hierarchisch gruppiert), auf die ein kritischer Bericht verweist, auf.</desc><classes><memberOf key="model.listLike"/></classes><content><sequence minOccurs="1" maxOccurs="1"><classRef key="model.headLike" minOccurs="0"/><elementRef key="desc" minOccurs="0" maxOccurs="unbounded"/><alternate minOccurs="1" maxOccurs="unbounded"><elementRef key="witness"/><elementRef key="listWit"/></alternate></sequence></content><attList/><exemplum xml:lang="en">
+  </listRef></elementSpec><elementSpec rend="change" module="textcrit" ident="listWit"><gloss xmlns:tei="http://www.tei-c.org/ns/1.0" xmlns:mei="http://www.music-encoding.org/ns/mei" xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0" xmlns:s="http://www.ascc.net/xml/schematron" rend="replace" versionDate="2013-11-11" xml:lang="en">witness list</gloss><gloss xmlns:tei="http://www.tei-c.org/ns/1.0" xmlns:mei="http://www.music-encoding.org/ns/mei" xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0" xmlns:s="http://www.ascc.net/xml/schematron" rend="replace" versionDate="2013-11-11" xml:lang="de">Liste von Zeugen</gloss><desc xmlns:tei="http://www.tei-c.org/ns/1.0" xmlns:mei="http://www.music-encoding.org/ns/mei" xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0" xmlns:s="http://www.ascc.net/xml/schematron" rend="replace" versionDate="2013-11-11" xml:lang="en">lists definitions for all the witnesses referred to by a critical apparatus, optionally grouped hierarchically.</desc><desc xmlns:tei="http://www.tei-c.org/ns/1.0" xmlns:mei="http://www.music-encoding.org/ns/mei" xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0" xmlns:s="http://www.ascc.net/xml/schematron" rend="replace" versionDate="2013-11-11" xml:lang="de">listet Definitionen für alle Zeugen (wahlweise hierarchisch gruppiert), auf die ein kritischer Bericht verweist, auf.</desc><classes><memberOf key="model.listLike"/></classes><content><sequence minOccurs="1" maxOccurs="1"><classRef key="model.headLike" minOccurs="0"/><elementRef key="desc" minOccurs="0" maxOccurs="unbounded"/><alternate minOccurs="1" maxOccurs="unbounded"><elementRef key="witness"/><elementRef key="listWit"/></alternate></sequence></content><constraintSpec xmlns:tei="http://www.tei-c.org/ns/1.0" xmlns:mei="http://www.music-encoding.org/ns/mei" xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0" xmlns:s="http://www.ascc.net/xml/schematron" scheme="schematron" ident="only-one-witness">
+                <constraint>
+                    <sch:report test="count(tei:witness) le 1">There should always be more than one witness within a listWit element.</sch:report>
+                </constraint>
+            </constraintSpec><attList/><exemplum xml:lang="en">
     <egXML xmlns="http://www.tei-c.org/ns/Examples">
       <listWit>
         <witness xml:id="HL26">Ellesmere, Huntingdon Library 26.C.9</witness>
diff --git a/compiled-ODD/guidelines-de-wega_all.compiled.xml b/compiled-ODD/guidelines-de-wega_all.compiled.xml
index fe24cec..427616a 100644
--- a/compiled-ODD/guidelines-de-wega_all.compiled.xml
+++ b/compiled-ODD/guidelines-de-wega_all.compiled.xml
@@ -18910,7 +18910,11 @@ form in the running text).</p>
     </egXML>
   </exemplum><listRef>
     <ref target="https://www.tei-c.org/release/doc/tei-p5-doc/en/html/TC.html#TCAPLL">12.1. The Apparatus Entry, Readings, and Witnesses</ref>
-  </listRef></elementSpec><elementSpec rend="change" module="textcrit" ident="listWit"><gloss xmlns:tei="http://www.tei-c.org/ns/1.0" xmlns:mei="http://www.music-encoding.org/ns/mei" xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0" xmlns:s="http://www.ascc.net/xml/schematron" rend="replace" versionDate="2013-11-11" xml:lang="en">witness list</gloss><gloss xmlns:tei="http://www.tei-c.org/ns/1.0" xmlns:mei="http://www.music-encoding.org/ns/mei" xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0" xmlns:s="http://www.ascc.net/xml/schematron" rend="replace" versionDate="2013-11-11" xml:lang="de">Liste von Zeugen</gloss><desc xmlns:tei="http://www.tei-c.org/ns/1.0" xmlns:mei="http://www.music-encoding.org/ns/mei" xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0" xmlns:s="http://www.ascc.net/xml/schematron" rend="replace" versionDate="2013-11-11" xml:lang="en">lists definitions for all the witnesses referred to by a critical apparatus, optionally grouped hierarchically.</desc><desc xmlns:tei="http://www.tei-c.org/ns/1.0" xmlns:mei="http://www.music-encoding.org/ns/mei" xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0" xmlns:s="http://www.ascc.net/xml/schematron" rend="replace" versionDate="2013-11-11" xml:lang="de">listet Definitionen für alle Zeugen (wahlweise hierarchisch gruppiert), auf die ein kritischer Bericht verweist, auf.</desc><classes><memberOf key="model.listLike"/></classes><content><sequence minOccurs="1" maxOccurs="1"><classRef key="model.headLike" minOccurs="0"/><elementRef key="desc" minOccurs="0" maxOccurs="unbounded"/><alternate minOccurs="1" maxOccurs="unbounded"><elementRef key="witness"/><elementRef key="listWit"/></alternate></sequence></content><attList/><exemplum xml:lang="en">
+  </listRef></elementSpec><elementSpec rend="change" module="textcrit" ident="listWit"><gloss xmlns:tei="http://www.tei-c.org/ns/1.0" xmlns:mei="http://www.music-encoding.org/ns/mei" xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0" xmlns:s="http://www.ascc.net/xml/schematron" rend="replace" versionDate="2013-11-11" xml:lang="en">witness list</gloss><gloss xmlns:tei="http://www.tei-c.org/ns/1.0" xmlns:mei="http://www.music-encoding.org/ns/mei" xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0" xmlns:s="http://www.ascc.net/xml/schematron" rend="replace" versionDate="2013-11-11" xml:lang="de">Liste von Zeugen</gloss><desc xmlns:tei="http://www.tei-c.org/ns/1.0" xmlns:mei="http://www.music-encoding.org/ns/mei" xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0" xmlns:s="http://www.ascc.net/xml/schematron" rend="replace" versionDate="2013-11-11" xml:lang="en">lists definitions for all the witnesses referred to by a critical apparatus, optionally grouped hierarchically.</desc><desc xmlns:tei="http://www.tei-c.org/ns/1.0" xmlns:mei="http://www.music-encoding.org/ns/mei" xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0" xmlns:s="http://www.ascc.net/xml/schematron" rend="replace" versionDate="2013-11-11" xml:lang="de">listet Definitionen für alle Zeugen (wahlweise hierarchisch gruppiert), auf die ein kritischer Bericht verweist, auf.</desc><classes><memberOf key="model.listLike"/></classes><content><sequence minOccurs="1" maxOccurs="1"><classRef key="model.headLike" minOccurs="0"/><elementRef key="desc" minOccurs="0" maxOccurs="unbounded"/><alternate minOccurs="1" maxOccurs="unbounded"><elementRef key="witness"/><elementRef key="listWit"/></alternate></sequence></content><constraintSpec xmlns:tei="http://www.tei-c.org/ns/1.0" xmlns:mei="http://www.music-encoding.org/ns/mei" xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0" xmlns:s="http://www.ascc.net/xml/schematron" scheme="schematron" ident="only-one-witness">
+                <constraint>
+                    <sch:report test="count(tei:witness) le 1">There should always be more than one witness within a listWit element.</sch:report>
+                </constraint>
+            </constraintSpec><attList/><exemplum xml:lang="en">
     <egXML xmlns="http://www.tei-c.org/ns/Examples">
       <listWit>
         <witness xml:id="HL26">Ellesmere, Huntingdon Library 26.C.9</witness>
diff --git a/schema/de/wegaDocuments.isosch b/schema/de/wegaDocuments.isosch
index 942e7e1..03b046a 100644
--- a/schema/de/wegaDocuments.isosch
+++ b/schema/de/wegaDocuments.isosch
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <schema xmlns="http://purl.oclc.org/dsdl/schematron" queryBinding="xslt2">
    <title>ISO Schematron rules</title>
-   <!-- This file generated 2020-12-17T13:21:54Z by 'extract-isosch.xsl'. -->
+   <!-- This file generated 2021-01-13T21:21:05Z by 'extract-isosch.xsl'. -->
 
    <!-- ********************* -->
    <!-- namespaces, declared: -->
@@ -507,46 +507,51 @@ relatedItem element must be empty</report>
                         <assert test="preceding::tei:witness[@xml:id = substring($wit, 2)]">The @wit-attribute must point at some witness element</assert>
                     </rule>
                 </pattern>
-   <pattern id="schematron-constraint-wegaDocuments-styleguide-document-node-content-75">
+   <pattern id="schematron-constraint-wegaDocuments-listWit-only-one-witness-75">
+      <rule context="tei:listWit">
+                    <report test="count(tei:witness) le 1">There should always be more than one witness within a listWit element.</report>
+                </rule>
+   </pattern>
+   <pattern id="schematron-constraint-wegaDocuments-styleguide-document-node-content-76">
                 <rule context="document-node()">
                     <report test="count(processing-instruction()) ne 2">WeGA styleguide error: there should exactly be two processing instructions before the root element</report>
                     <report test="comment()">WeGA styleguide error: there should be no comments outside the root element</report>
                 </rule>
             </pattern>
-   <pattern id="schematron-constraint-wegaDocuments-whitespaceOnlyContent-76">
+   <pattern id="schematron-constraint-wegaDocuments-whitespaceOnlyContent-77">
                 <rule context="tei:surname | tei:forename | tei:persName | tei:author[not(@sameAs)] | tei:occupation | tei:settlement | tei:country | tei:region | tei:rs | tei:workName | tei:characterName | tei:hi[not(.//tei:gap)] | tei:head | tei:note[not(@type=('thematicCom'))] | tei:placeName | tei:title | tei:seg | tei:item[not(@* or *)]">
                     <report test="normalize-space(.) = ''">
             <name/> has whitespace only content</report>
                 </rule>
             </pattern>
-   <pattern id="schematron-constraint-wegaDocuments-elementStartsWithWhitespace-77">
+   <pattern id="schematron-constraint-wegaDocuments-elementStartsWithWhitespace-78">
                 <rule context="tei:surname | tei:forename | tei:persName[not(@type)] | tei:author | tei:occupation | tei:settlement | tei:country | tei:region | tei:rs | tei:workName | tei:characterName | tei:hi | tei:placeName[not(parent::tei:address or parent::tei:birth or parent::tei:death)]">
                     <report test="matches(.,'^\s') and (node()[1] = text()[1])">whitespace at the beginning of element <name/>
          </report>
                 </rule>
             </pattern>
-   <pattern id="schematron-constraint-wegaDocuments-untrimmedAttributeValues-78">
+   <pattern id="schematron-constraint-wegaDocuments-untrimmedAttributeValues-79">
                 <rule context="*">
                     <report test="some $i in @* satisfies string-length(normalize-unicode(normalize-space(replace($i, ' | | | ', ' ')))) ne string-length($i)">There is some whitespace here at the beginning or end of some attribute value.</report>
                 </rule>
             </pattern>
-   <pattern id="schematron-constraint-wegaDocuments-wegaTargets-79">
+   <pattern id="schematron-constraint-wegaDocuments-wegaTargets-80">
                 <rule context="*[starts-with(@target, 'wega:')]">
                     <assert test="matches(@target, '^wega:A[0-9A-F]{6}(#.+)?(\s+wega:A[0-9A-F]{6}(#.+)?)*$')">"wega"-prefixed URIs must follow the pattern "wega:A002068" (i.e. without any file extension)</assert>
                 </rule>
             </pattern>
-   <pattern id="schematron-constraint-wegaDocuments-emojiCheck-80">
+   <pattern id="schematron-constraint-wegaDocuments-emojiCheck-81">
                 <rule context="*[some $i in text() satisfies normalize-space($i) ne '']">
                     <report test="matches(., '[⌚-⌛]|[⏩-⏬]|[⏰]|[⏳]|[◽-◾]|[☔-☕]|[♈-♓]|[♿]|[⚓]|[⚡]|[⚪-⚫]|[⚽-⚾]|[⛄-⛅]|[⛎]|[⛔]|[⛪]|[⛲-⛳]|[⛵]|[⛺]|[⛽]|[✅]|[✊-✋]|[✨]|[❌]|[❎]|[❓-❕]|[❗]|[➕-➗]|[➰]|[➿]|[⬛-⬜]|[⭐]|[⭕]|[🀄]|[🃏]|[🆎]|[🆑-🆚]|[🇦-🇿]|[🈁]|[🈚]|[🈯]|[🈲-🈶]|[🈸-🈺]|[🉐-🉑]|[🌀-🌠]|[🌭-🌯]|[🌰-🌵]|[🌷-🍼]|[🍾-🍿]|[🎀-🎓]|[🎠-🏄]|[🏅]|[🏆-🏊]|[🏏-🏓]|[🏠-🏰]|[🏴]|[🏸-🏿]|[🐀-🐾]|[👀]|[👂-📷]|[📸]|[📹-📼]|[📿]|[🔀-🔽]|[🕋-🕎]|[🕐-🕧]|[🕺]|[🖕-🖖]|[🖤]|[🗻-🗿]|[😀]|[😁-😐]|[😑]|[😒-😔]|[😕]|[😖]|[😗]|[😘]|[😙]|[😚]|[😛]|[😜-😞]|[😟]|[😠-😥]|[😦-😧]|[😨-😫]|[😬]|[😭]|[😮-😯]|[😰-😳]|[😴]|[😵-🙀]|[🙁-🙂]|[🙃-🙄]|[🙅-🙏]|[🚀-🛅]|[🛌]|[🛐]|[🛑-🛒]|[🛕]|[🛫-🛬]|[🛴-🛶]|[🛷-🛸]|[🛹]|[🛺]|[🟠-🟫]|[🤍-🤏]|[🤐-🤘]|[🤙-🤞]|[🤟]|[🤠-🤧]|[🤨-🤯]|[🤰]|[🤱-🤲]|[🤳-🤺]|[🤼-🤾]|[🤿]|[🥀-🥅]|[🥇-🥋]|[🥌]|[🥍-🥏]|[🥐-🥞]|[🥟-🥫]|[🥬-🥰]|[🥱]|[🥳-🥶]|[🥺]|[🥻]|[🥼-🥿]|[🦀-🦄]|[🦅-🦑]|[🦒-🦗]|[🦘-🦢]|[🦥-🦪]|[🦮-🦯]|[🦰-🦹]|[🦺-🦿]|[🧀]|[🧁-🧂]|[🧃-🧊]|[🧍-🧏]|[🧐-🧦]|[🧧-🧿]|[🩰-🩳]|[🩸-🩺]|[🪀-🪂]|[🪐-🪕]')">Text contains characters with Emoji presentation as default.</report>
                 </rule>
             </pattern>
-   <pattern id="schematron-constraint-wegaDocuments-sourceMustResolve-81">
+   <pattern id="schematron-constraint-wegaDocuments-sourceMustResolve-82">
                 <rule context="*[starts-with(@source, '#')]">
                     <let name="source" value="@source"/>
                     <assert test="id(substring($source,2))">Unable to locate the reference provided by the @source attribute.</assert>
                 </rule>
             </pattern>
-   <pattern id="schematron-constraint-wegaDocuments-att.wega.rend-underline-n-82">
+   <pattern id="schematron-constraint-wegaDocuments-att.wega.rend-underline-n-83">
                     <rule context="*:hi[@n] | *:rend[@n]">
                         <report test="@rend ne 'underline'">The @n-attribute is only supported in combination with @rend='underline'</report>
                     </rule>
diff --git a/schema/de/wegaDocuments.rng b/schema/de/wegaDocuments.rng
index 3e852ea..9f2e08a 100644
--- a/schema/de/wegaDocuments.rng
+++ b/schema/de/wegaDocuments.rng
@@ -5,7 +5,7 @@
          xmlns="http://relaxng.org/ns/structure/1.0"
          datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes"
          ns="http://www.tei-c.org/ns/1.0"><!--
-Schema generated from ODD source 2020-12-17T13:27:37Z. .
+Schema generated from ODD source 2021-01-13T21:21:04Z. .
 TEI Edition: Version 4.1.0. Last updated on
 	19th August 2020, revision b414ba550
 TEI Edition Location: https://www.tei-c.org/Vault/P5/Version 4.1.0/
@@ -5985,6 +5985,18 @@ Empfohlene Werte sind: 1] label; 2] data</a:documentation>
                </choice>
             </oneOrMore>
          </group>
+         <pattern xmlns="http://purl.oclc.org/dsdl/schematron"
+                  id="wegaDocuments-listWit-only-one-witness-constraint-report-48">
+            <rule context="tei:listWit">
+               <sch:report xmlns:mei="http://www.music-encoding.org/ns/mei"
+                           xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0"
+                           xmlns:s="http://www.ascc.net/xml/schematron"
+                           xmlns:sch="http://purl.oclc.org/dsdl/schematron"
+                           xmlns="http://www.tei-c.org/ns/1.0"
+                           xmlns:rng="http://relaxng.org/ns/structure/1.0"
+                           test="count(tei:witness) le 1">There should always be more than one witness within a listWit element.</sch:report>
+            </rule>
+         </pattern>
       </element>
    </define>
    <define name="witness">
diff --git a/schema/de/wegaLetters.isosch b/schema/de/wegaLetters.isosch
index eedd4cf..b15b0c2 100644
--- a/schema/de/wegaLetters.isosch
+++ b/schema/de/wegaLetters.isosch
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <schema xmlns="http://purl.oclc.org/dsdl/schematron" queryBinding="xslt2">
    <title>ISO Schematron rules</title>
-   <!-- This file generated 2020-12-17T13:21:54Z by 'extract-isosch.xsl'. -->
+   <!-- This file generated 2021-01-13T21:21:05Z by 'extract-isosch.xsl'. -->
 
    <!-- ********************* -->
    <!-- namespaces, declared: -->
@@ -517,52 +517,57 @@ relatedItem element must be empty</report>
                         <assert test="preceding::tei:witness[@xml:id = substring($wit, 2)]">The @wit-attribute must point at some witness element</assert>
                     </rule>
                 </pattern>
-   <pattern id="schematron-constraint-wegaLetters-styleguide-document-node-content-77">
+   <pattern id="schematron-constraint-wegaLetters-listWit-only-one-witness-77">
+      <rule context="tei:listWit">
+                    <report test="count(tei:witness) le 1">There should always be more than one witness within a listWit element.</report>
+                </rule>
+   </pattern>
+   <pattern id="schematron-constraint-wegaLetters-styleguide-document-node-content-78">
                 <rule context="document-node()">
                     <report test="count(processing-instruction()) ne 2">WeGA styleguide error: there should exactly be two processing instructions before the root element</report>
                     <report test="comment()">WeGA styleguide error: there should be no comments outside the root element</report>
                 </rule>
             </pattern>
-   <pattern id="schematron-constraint-wegaLetters-whitespaceOnlyContent-78">
+   <pattern id="schematron-constraint-wegaLetters-whitespaceOnlyContent-79">
                 <rule context="tei:surname | tei:forename | tei:persName | tei:author[not(@sameAs)] | tei:occupation | tei:settlement | tei:country | tei:region | tei:rs | tei:workName | tei:characterName | tei:hi[not(.//tei:gap)] | tei:head | tei:note[not(@type=('thematicCom'))] | tei:placeName | tei:title | tei:seg | tei:item[not(@* or *)]">
                     <report test="normalize-space(.) = ''">
             <name/> has whitespace only content</report>
                 </rule>
             </pattern>
-   <pattern id="schematron-constraint-wegaLetters-elementStartsWithWhitespace-79">
+   <pattern id="schematron-constraint-wegaLetters-elementStartsWithWhitespace-80">
                 <rule context="tei:surname | tei:forename | tei:persName[not(@type)] | tei:author | tei:occupation | tei:settlement | tei:country | tei:region | tei:rs | tei:workName | tei:characterName | tei:hi | tei:placeName[not(parent::tei:address or parent::tei:birth or parent::tei:death)]">
                     <report test="matches(.,'^\s') and (node()[1] = text()[1])">whitespace at the beginning of element <name/>
          </report>
                 </rule>
             </pattern>
-   <pattern id="schematron-constraint-wegaLetters-untrimmedAttributeValues-80">
+   <pattern id="schematron-constraint-wegaLetters-untrimmedAttributeValues-81">
                 <rule context="*">
                     <report test="some $i in @* satisfies string-length(normalize-unicode(normalize-space(replace($i, ' | | | ', ' ')))) ne string-length($i)">There is some whitespace here at the beginning or end of some attribute value.</report>
                 </rule>
             </pattern>
-   <pattern id="schematron-constraint-wegaLetters-wegaTargets-81">
+   <pattern id="schematron-constraint-wegaLetters-wegaTargets-82">
                 <rule context="*[starts-with(@target, 'wega:')]">
                     <assert test="matches(@target, '^wega:A[0-9A-F]{6}(#.+)?(\s+wega:A[0-9A-F]{6}(#.+)?)*$')">"wega"-prefixed URIs must follow the pattern "wega:A002068" (i.e. without any file extension)</assert>
                 </rule>
             </pattern>
-   <pattern id="schematron-constraint-wegaLetters-emojiCheck-82">
+   <pattern id="schematron-constraint-wegaLetters-emojiCheck-83">
                 <rule context="*[some $i in text() satisfies normalize-space($i) ne '']">
                     <report test="matches(., '[⌚-⌛]|[⏩-⏬]|[⏰]|[⏳]|[◽-◾]|[☔-☕]|[♈-♓]|[♿]|[⚓]|[⚡]|[⚪-⚫]|[⚽-⚾]|[⛄-⛅]|[⛎]|[⛔]|[⛪]|[⛲-⛳]|[⛵]|[⛺]|[⛽]|[✅]|[✊-✋]|[✨]|[❌]|[❎]|[❓-❕]|[❗]|[➕-➗]|[➰]|[➿]|[⬛-⬜]|[⭐]|[⭕]|[🀄]|[🃏]|[🆎]|[🆑-🆚]|[🇦-🇿]|[🈁]|[🈚]|[🈯]|[🈲-🈶]|[🈸-🈺]|[🉐-🉑]|[🌀-🌠]|[🌭-🌯]|[🌰-🌵]|[🌷-🍼]|[🍾-🍿]|[🎀-🎓]|[🎠-🏄]|[🏅]|[🏆-🏊]|[🏏-🏓]|[🏠-🏰]|[🏴]|[🏸-🏿]|[🐀-🐾]|[👀]|[👂-📷]|[📸]|[📹-📼]|[📿]|[🔀-🔽]|[🕋-🕎]|[🕐-🕧]|[🕺]|[🖕-🖖]|[🖤]|[🗻-🗿]|[😀]|[😁-😐]|[😑]|[😒-😔]|[😕]|[😖]|[😗]|[😘]|[😙]|[😚]|[😛]|[😜-😞]|[😟]|[😠-😥]|[😦-😧]|[😨-😫]|[😬]|[😭]|[😮-😯]|[😰-😳]|[😴]|[😵-🙀]|[🙁-🙂]|[🙃-🙄]|[🙅-🙏]|[🚀-🛅]|[🛌]|[🛐]|[🛑-🛒]|[🛕]|[🛫-🛬]|[🛴-🛶]|[🛷-🛸]|[🛹]|[🛺]|[🟠-🟫]|[🤍-🤏]|[🤐-🤘]|[🤙-🤞]|[🤟]|[🤠-🤧]|[🤨-🤯]|[🤰]|[🤱-🤲]|[🤳-🤺]|[🤼-🤾]|[🤿]|[🥀-🥅]|[🥇-🥋]|[🥌]|[🥍-🥏]|[🥐-🥞]|[🥟-🥫]|[🥬-🥰]|[🥱]|[🥳-🥶]|[🥺]|[🥻]|[🥼-🥿]|[🦀-🦄]|[🦅-🦑]|[🦒-🦗]|[🦘-🦢]|[🦥-🦪]|[🦮-🦯]|[🦰-🦹]|[🦺-🦿]|[🧀]|[🧁-🧂]|[🧃-🧊]|[🧍-🧏]|[🧐-🧦]|[🧧-🧿]|[🩰-🩳]|[🩸-🩺]|[🪀-🪂]|[🪐-🪕]')">Text contains characters with Emoji presentation as default.</report>
                 </rule>
             </pattern>
-   <pattern id="schematron-constraint-wegaLetters-sourceMustResolve-83">
+   <pattern id="schematron-constraint-wegaLetters-sourceMustResolve-84">
                 <rule context="*[starts-with(@source, '#')]">
                     <let name="source" value="@source"/>
                     <assert test="id(substring($source,2))">Unable to locate the reference provided by the @source attribute.</assert>
                 </rule>
             </pattern>
-   <pattern id="schematron-constraint-wegaLetters-styleguide-document-node-content-84">
+   <pattern id="schematron-constraint-wegaLetters-styleguide-document-node-content-85">
                 <rule context="document-node()">
                     <report test="count(processing-instruction()) ne 2">WeGA styleguide error: there should exactly be two processing instructions before the root element</report>
                     <report test="comment()">WeGA styleguide error: there should be no comments outside the root element</report>
                 </rule>
             </pattern>
-   <pattern id="schematron-constraint-wegaLetters-att.wega.rend-underline-n-85">
+   <pattern id="schematron-constraint-wegaLetters-att.wega.rend-underline-n-86">
                     <rule context="*:hi[@n] | *:rend[@n]">
                         <report test="@rend ne 'underline'">The @n-attribute is only supported in combination with @rend='underline'</report>
                     </rule>
diff --git a/schema/de/wegaLetters.rng b/schema/de/wegaLetters.rng
index 0ab50ff..30bb328 100644
--- a/schema/de/wegaLetters.rng
+++ b/schema/de/wegaLetters.rng
@@ -5,7 +5,7 @@
          xmlns="http://relaxng.org/ns/structure/1.0"
          datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes"
          ns="http://www.tei-c.org/ns/1.0"><!--
-Schema generated from ODD source 2020-12-17T13:27:38Z. .
+Schema generated from ODD source 2021-01-13T21:21:05Z. .
 TEI Edition: Version 4.1.0. Last updated on
 	19th August 2020, revision b414ba550
 TEI Edition Location: https://www.tei-c.org/Vault/P5/Version 4.1.0/
@@ -6560,6 +6560,18 @@ Empfohlene Werte sind: 1] label; 2] data</a:documentation>
                </choice>
             </oneOrMore>
          </group>
+         <pattern xmlns="http://purl.oclc.org/dsdl/schematron"
+                  id="wegaLetters-listWit-only-one-witness-constraint-report-50">
+            <rule context="tei:listWit">
+               <sch:report xmlns:mei="http://www.music-encoding.org/ns/mei"
+                           xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0"
+                           xmlns:s="http://www.ascc.net/xml/schematron"
+                           xmlns:sch="http://purl.oclc.org/dsdl/schematron"
+                           xmlns="http://www.tei-c.org/ns/1.0"
+                           xmlns:rng="http://relaxng.org/ns/structure/1.0"
+                           test="count(tei:witness) le 1">There should always be more than one witness within a listWit element.</sch:report>
+            </rule>
+         </pattern>
       </element>
    </define>
    <define name="witness">
diff --git a/schema/de/wegaWritings.isosch b/schema/de/wegaWritings.isosch
index 4386743..f26eff9 100644
--- a/schema/de/wegaWritings.isosch
+++ b/schema/de/wegaWritings.isosch
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <schema xmlns="http://purl.oclc.org/dsdl/schematron" queryBinding="xslt2">
    <title>ISO Schematron rules</title>
-   <!-- This file generated 2020-12-17T13:21:59Z by 'extract-isosch.xsl'. -->
+   <!-- This file generated 2021-01-13T21:21:11Z by 'extract-isosch.xsl'. -->
 
    <!-- ********************* -->
    <!-- namespaces, declared: -->
@@ -507,52 +507,57 @@ relatedItem element must be empty</report>
                         <assert test="preceding::tei:witness[@xml:id = substring($wit, 2)]">The @wit-attribute must point at some witness element</assert>
                     </rule>
                 </pattern>
-   <pattern id="schematron-constraint-wegaWritings-whitespaceOnlyContent-75">
+   <pattern id="schematron-constraint-wegaWritings-listWit-only-one-witness-75">
+      <rule context="tei:listWit">
+                    <report test="count(tei:witness) le 1">There should always be more than one witness within a listWit element.</report>
+                </rule>
+   </pattern>
+   <pattern id="schematron-constraint-wegaWritings-whitespaceOnlyContent-76">
                 <rule context="tei:surname | tei:forename | tei:persName | tei:author[not(@sameAs)] | tei:occupation | tei:settlement | tei:country | tei:region | tei:rs | tei:workName | tei:characterName | tei:hi[not(.//tei:gap)] | tei:head | tei:note[not(@type=('thematicCom'))] | tei:placeName | tei:title | tei:seg | tei:item[not(@* or *)]">
                     <report test="normalize-space(.) = ''">
             <name/> has whitespace only content</report>
                 </rule>
             </pattern>
-   <pattern id="schematron-constraint-wegaWritings-elementStartsWithWhitespace-76">
+   <pattern id="schematron-constraint-wegaWritings-elementStartsWithWhitespace-77">
                 <rule context="tei:surname | tei:forename | tei:persName[not(@type)] | tei:author | tei:occupation | tei:settlement | tei:country | tei:region | tei:rs | tei:workName | tei:characterName | tei:hi | tei:placeName[not(parent::tei:address or parent::tei:birth or parent::tei:death)]">
                     <report test="matches(.,'^\s') and (node()[1] = text()[1])">whitespace at the beginning of element <name/>
          </report>
                 </rule>
             </pattern>
-   <pattern id="schematron-constraint-wegaWritings-untrimmedAttributeValues-77">
+   <pattern id="schematron-constraint-wegaWritings-untrimmedAttributeValues-78">
                 <rule context="*">
                     <report test="some $i in @* satisfies string-length(normalize-unicode(normalize-space(replace($i, ' | | | ', ' ')))) ne string-length($i)">There is some whitespace here at the beginning or end of some attribute value.</report>
                 </rule>
             </pattern>
-   <pattern id="schematron-constraint-wegaWritings-wegaTargets-78">
+   <pattern id="schematron-constraint-wegaWritings-wegaTargets-79">
                 <rule context="*[starts-with(@target, 'wega:')]">
                     <assert test="matches(@target, '^wega:A[0-9A-F]{6}(#.+)?(\s+wega:A[0-9A-F]{6}(#.+)?)*$')">"wega"-prefixed URIs must follow the pattern "wega:A002068" (i.e. without any file extension)</assert>
                 </rule>
             </pattern>
-   <pattern id="schematron-constraint-wegaWritings-emojiCheck-79">
+   <pattern id="schematron-constraint-wegaWritings-emojiCheck-80">
                 <rule context="*[some $i in text() satisfies normalize-space($i) ne '']">
                     <report test="matches(., '[⌚-⌛]|[⏩-⏬]|[⏰]|[⏳]|[◽-◾]|[☔-☕]|[♈-♓]|[♿]|[⚓]|[⚡]|[⚪-⚫]|[⚽-⚾]|[⛄-⛅]|[⛎]|[⛔]|[⛪]|[⛲-⛳]|[⛵]|[⛺]|[⛽]|[✅]|[✊-✋]|[✨]|[❌]|[❎]|[❓-❕]|[❗]|[➕-➗]|[➰]|[➿]|[⬛-⬜]|[⭐]|[⭕]|[🀄]|[🃏]|[🆎]|[🆑-🆚]|[🇦-🇿]|[🈁]|[🈚]|[🈯]|[🈲-🈶]|[🈸-🈺]|[🉐-🉑]|[🌀-🌠]|[🌭-🌯]|[🌰-🌵]|[🌷-🍼]|[🍾-🍿]|[🎀-🎓]|[🎠-🏄]|[🏅]|[🏆-🏊]|[🏏-🏓]|[🏠-🏰]|[🏴]|[🏸-🏿]|[🐀-🐾]|[👀]|[👂-📷]|[📸]|[📹-📼]|[📿]|[🔀-🔽]|[🕋-🕎]|[🕐-🕧]|[🕺]|[🖕-🖖]|[🖤]|[🗻-🗿]|[😀]|[😁-😐]|[😑]|[😒-😔]|[😕]|[😖]|[😗]|[😘]|[😙]|[😚]|[😛]|[😜-😞]|[😟]|[😠-😥]|[😦-😧]|[😨-😫]|[😬]|[😭]|[😮-😯]|[😰-😳]|[😴]|[😵-🙀]|[🙁-🙂]|[🙃-🙄]|[🙅-🙏]|[🚀-🛅]|[🛌]|[🛐]|[🛑-🛒]|[🛕]|[🛫-🛬]|[🛴-🛶]|[🛷-🛸]|[🛹]|[🛺]|[🟠-🟫]|[🤍-🤏]|[🤐-🤘]|[🤙-🤞]|[🤟]|[🤠-🤧]|[🤨-🤯]|[🤰]|[🤱-🤲]|[🤳-🤺]|[🤼-🤾]|[🤿]|[🥀-🥅]|[🥇-🥋]|[🥌]|[🥍-🥏]|[🥐-🥞]|[🥟-🥫]|[🥬-🥰]|[🥱]|[🥳-🥶]|[🥺]|[🥻]|[🥼-🥿]|[🦀-🦄]|[🦅-🦑]|[🦒-🦗]|[🦘-🦢]|[🦥-🦪]|[🦮-🦯]|[🦰-🦹]|[🦺-🦿]|[🧀]|[🧁-🧂]|[🧃-🧊]|[🧍-🧏]|[🧐-🧦]|[🧧-🧿]|[🩰-🩳]|[🩸-🩺]|[🪀-🪂]|[🪐-🪕]')">Text contains characters with Emoji presentation as default.</report>
                 </rule>
             </pattern>
-   <pattern id="schematron-constraint-wegaWritings-sourceMustResolve-80">
+   <pattern id="schematron-constraint-wegaWritings-sourceMustResolve-81">
                 <rule context="*[starts-with(@source, '#')]">
                     <let name="source" value="@source"/>
                     <assert test="id(substring($source,2))">Unable to locate the reference provided by the @source attribute.</assert>
                 </rule>
             </pattern>
-   <pattern id="schematron-constraint-wegaWritings-styleguide-document-node-content-81">
+   <pattern id="schematron-constraint-wegaWritings-styleguide-document-node-content-82">
                 <rule context="document-node()">
                     <report test="count(processing-instruction()) ne 2">WeGA styleguide error: there should exactly be two processing instructions before the root element</report>
                     <report test="comment()">WeGA styleguide error: there should be no comments outside the root element</report>
                 </rule>
             </pattern>
-   <pattern id="schematron-constraint-wegaWritings-styleguide-document-node-content-82">
+   <pattern id="schematron-constraint-wegaWritings-styleguide-document-node-content-83">
                 <rule context="document-node()">
                     <report test="count(processing-instruction()) ne 2">WeGA styleguide error: there should exactly be two processing instructions before the root element</report>
                     <report test="comment()">WeGA styleguide error: there should be no comments outside the root element</report>
                 </rule>
             </pattern>
-   <pattern id="schematron-constraint-wegaWritings-att.wega.rend-underline-n-83">
+   <pattern id="schematron-constraint-wegaWritings-att.wega.rend-underline-n-84">
                     <rule context="*:hi[@n] | *:rend[@n]">
                         <report test="@rend ne 'underline'">The @n-attribute is only supported in combination with @rend='underline'</report>
                     </rule>
diff --git a/schema/de/wegaWritings.rng b/schema/de/wegaWritings.rng
index b607e68..16c227f 100644
--- a/schema/de/wegaWritings.rng
+++ b/schema/de/wegaWritings.rng
@@ -5,7 +5,7 @@
          xmlns="http://relaxng.org/ns/structure/1.0"
          datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes"
          ns="http://www.tei-c.org/ns/1.0"><!--
-Schema generated from ODD source 2020-12-17T13:27:43Z. .
+Schema generated from ODD source 2021-01-13T21:21:10Z. .
 TEI Edition: Version 4.1.0. Last updated on
 	19th August 2020, revision b414ba550
 TEI Edition Location: https://www.tei-c.org/Vault/P5/Version 4.1.0/
@@ -5967,6 +5967,18 @@ Empfohlene Werte sind: 1] label; 2] data</a:documentation>
                </choice>
             </oneOrMore>
          </group>
+         <pattern xmlns="http://purl.oclc.org/dsdl/schematron"
+                  id="wegaWritings-listWit-only-one-witness-constraint-report-48">
+            <rule context="tei:listWit">
+               <sch:report xmlns:mei="http://www.music-encoding.org/ns/mei"
+                           xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0"
+                           xmlns:s="http://www.ascc.net/xml/schematron"
+                           xmlns:sch="http://purl.oclc.org/dsdl/schematron"
+                           xmlns="http://www.tei-c.org/ns/1.0"
+                           xmlns:rng="http://relaxng.org/ns/structure/1.0"
+                           test="count(tei:witness) le 1">There should always be more than one witness within a listWit element.</sch:report>
+            </rule>
+         </pattern>
       </element>
    </define>
    <define name="witness">
diff --git a/schema/de/wega_all.isosch b/schema/de/wega_all.isosch
index 24777e8..e4d8663 100644
--- a/schema/de/wega_all.isosch
+++ b/schema/de/wega_all.isosch
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <schema xmlns="http://purl.oclc.org/dsdl/schematron" queryBinding="xslt2">
    <title>ISO Schematron rules</title>
-   <!-- This file generated 2020-12-17T13:21:59Z by 'extract-isosch.xsl'. -->
+   <!-- This file generated 2021-01-13T21:21:10Z by 'extract-isosch.xsl'. -->
 
    <!-- ********************* -->
    <!-- namespaces, declared: -->
@@ -478,99 +478,104 @@ On <name/>, either the @marks attribute should be used, or a paragraph of descri
                         <assert test="preceding::tei:witness[@xml:id = substring($wit, 2)]">The @wit-attribute must point at some witness element</assert>
                     </rule>
                 </pattern>
+   <pattern id="schematron-constraint-wega_all-listWit-only-one-witness-68">
+      <rule context="tei:listWit">
+                    <report test="count(tei:witness) le 1">There should always be more than one witness within a listWit element.</report>
+                </rule>
+   </pattern>
       
       
     
       
-    <pattern id="schematron-constraint-wega_all-div-abstractModel-structure-l-70">
+    <pattern id="schematron-constraint-wega_all-div-abstractModel-structure-l-71">
       <rule context="tei:div">
          <report test="ancestor::tei:l">
         Abstract model violation: Lines may not contain higher-level structural elements such as div.
       </report>
       </rule>
    </pattern>
-   <pattern id="schematron-constraint-wega_all-div-abstractModel-structure-p-71">
+   <pattern id="schematron-constraint-wega_all-div-abstractModel-structure-p-72">
       <rule context="tei:div">
          <report test="ancestor::tei:p or ancestor::tei:ab and not(ancestor::tei:floatingText)">
         Abstract model violation: p and ab may not contain higher-level structural elements such as div.
       </report>
       </rule>
    </pattern>
-   <pattern id="schematron-constraint-wega_all-facsimile-graphicOrSameAs-72">
+   <pattern id="schematron-constraint-wega_all-facsimile-graphicOrSameAs-73">
       <rule context="tei:facsimile">
                     <assert test="@sameAs or tei:graphic">A facsimile element must have (at least) a nested graphic element or a @sameAs attribute</assert>
                 </rule>
    </pattern>
-   <pattern id="schematron-constraint-wega_all-facsimile-sourceNwitness-73">
+   <pattern id="schematron-constraint-wega_all-facsimile-sourceNwitness-74">
                     <rule context="tei:facsimile[preceding::tei:witness or preceding::tei:msFrag or preceding-sibling::tei:facsimile or following-sibling::tei:facsimile]">
                         <let name="source" value="@source"/>
                         <assert test="@source and preceding::tei:sourceDesc//tei:*[concat('#',@xml:id) = $source]">A facsimile element must have a @source attribute pointing at the respective element in the sourceDesc</assert>
                     </rule>
                 </pattern>
-   <pattern id="schematron-constraint-wega_all-facsimile-sourcePattern-74">
+   <pattern id="schematron-constraint-wega_all-facsimile-sourcePattern-75">
                     <rule context="tei:facsimile[@source]">
                         <let name="source" value="@source"/>
                         <assert test="matches(@source, '^https?|#')">The source attribute must be a local reference (starting with '#') or a pointer to an online resource (starting with http)</assert>
                     </rule>
                 </pattern>
-   <pattern id="schematron-constraint-wega_all-addSpan-spanTo-75">
+   <pattern id="schematron-constraint-wega_all-addSpan-spanTo-76">
       <rule context="tei:addSpan">
          <assert test="@spanTo">The @spanTo attribute of <name/> is required.</assert>
       </rule>
    </pattern>
-   <pattern id="schematron-constraint-wega_all-addSpan-spanTo-spanTo-7-77">
+   <pattern id="schematron-constraint-wega_all-addSpan-spanTo-spanTo-7-78">
                             <rule context="tei:*[@spanTo]">
                                 <assert test="id(substring(@spanTo,2)) and following::*[@xml:id=substring(current()/@spanTo,2)]">
                                     The element indicated by @spanTo (<value-of select="@spanTo"/>) must follow the current element <name/>
                                 </assert>
                             </rule>
                         </pattern>
-   <pattern id="schematron-constraint-wega_all-subst-substContents1-78">
+   <pattern id="schematron-constraint-wega_all-subst-substContents1-79">
       <rule context="tei:subst">
          <assert test="child::tei:add and (child::tei:del or child::tei:surplus)">
             <name/> must have at least one child add and at least one child del or surplus</assert>
       </rule>
    </pattern>
-   <pattern id="schematron-constraint-wega_all-styleguide-document-node-content-79">
+   <pattern id="schematron-constraint-wega_all-styleguide-document-node-content-80">
                 <rule context="document-node()">
                     <report test="count(processing-instruction()) ne 2">WeGA styleguide error: there should exactly be two processing instructions before the root element</report>
                     <report test="comment()">WeGA styleguide error: there should be no comments outside the root element</report>
                 </rule>
             </pattern>
-   <pattern id="schematron-constraint-wega_all-whitespaceOnlyContent-80">
+   <pattern id="schematron-constraint-wega_all-whitespaceOnlyContent-81">
                 <rule context="tei:surname | tei:forename | tei:persName | tei:author[not(@sameAs)] | tei:occupation | tei:settlement | tei:country | tei:region | tei:rs | tei:workName | tei:characterName | tei:hi[not(.//tei:gap)] | tei:head | tei:note[not(@type=('thematicCom'))] | tei:placeName | tei:title | tei:seg | tei:item[not(@* or *)]">
                     <report test="normalize-space(.) = ''">
             <name/> has whitespace only content</report>
                 </rule>
             </pattern>
-   <pattern id="schematron-constraint-wega_all-elementStartsWithWhitespace-81">
+   <pattern id="schematron-constraint-wega_all-elementStartsWithWhitespace-82">
                 <rule context="tei:surname | tei:forename | tei:persName[not(@type)] | tei:author | tei:occupation | tei:settlement | tei:country | tei:region | tei:rs | tei:workName | tei:characterName | tei:hi | tei:placeName[not(parent::tei:address or parent::tei:birth or parent::tei:death)]">
                     <report test="matches(.,'^\s') and (node()[1] = text()[1])">whitespace at the beginning of element <name/>
          </report>
                 </rule>
             </pattern>
-   <pattern id="schematron-constraint-wega_all-untrimmedAttributeValues-82">
+   <pattern id="schematron-constraint-wega_all-untrimmedAttributeValues-83">
                 <rule context="*">
                     <report test="some $i in @* satisfies string-length(normalize-unicode(normalize-space(replace($i, ' | | | ', ' ')))) ne string-length($i)">There is some whitespace here at the beginning or end of some attribute value.</report>
                 </rule>
             </pattern>
-   <pattern id="schematron-constraint-wega_all-wegaTargets-83">
+   <pattern id="schematron-constraint-wega_all-wegaTargets-84">
                 <rule context="*[starts-with(@target, 'wega:')]">
                     <assert test="matches(@target, '^wega:A[0-9A-F]{6}(#.+)?(\s+wega:A[0-9A-F]{6}(#.+)?)*$')">"wega"-prefixed URIs must follow the pattern "wega:A002068" (i.e. without any file extension)</assert>
                 </rule>
             </pattern>
-   <pattern id="schematron-constraint-wega_all-emojiCheck-84">
+   <pattern id="schematron-constraint-wega_all-emojiCheck-85">
                 <rule context="*[some $i in text() satisfies normalize-space($i) ne '']">
                     <report test="matches(., '[⌚-⌛]|[⏩-⏬]|[⏰]|[⏳]|[◽-◾]|[☔-☕]|[♈-♓]|[♿]|[⚓]|[⚡]|[⚪-⚫]|[⚽-⚾]|[⛄-⛅]|[⛎]|[⛔]|[⛪]|[⛲-⛳]|[⛵]|[⛺]|[⛽]|[✅]|[✊-✋]|[✨]|[❌]|[❎]|[❓-❕]|[❗]|[➕-➗]|[➰]|[➿]|[⬛-⬜]|[⭐]|[⭕]|[🀄]|[🃏]|[🆎]|[🆑-🆚]|[🇦-🇿]|[🈁]|[🈚]|[🈯]|[🈲-🈶]|[🈸-🈺]|[🉐-🉑]|[🌀-🌠]|[🌭-🌯]|[🌰-🌵]|[🌷-🍼]|[🍾-🍿]|[🎀-🎓]|[🎠-🏄]|[🏅]|[🏆-🏊]|[🏏-🏓]|[🏠-🏰]|[🏴]|[🏸-🏿]|[🐀-🐾]|[👀]|[👂-📷]|[📸]|[📹-📼]|[📿]|[🔀-🔽]|[🕋-🕎]|[🕐-🕧]|[🕺]|[🖕-🖖]|[🖤]|[🗻-🗿]|[😀]|[😁-😐]|[😑]|[😒-😔]|[😕]|[😖]|[😗]|[😘]|[😙]|[😚]|[😛]|[😜-😞]|[😟]|[😠-😥]|[😦-😧]|[😨-😫]|[😬]|[😭]|[😮-😯]|[😰-😳]|[😴]|[😵-🙀]|[🙁-🙂]|[🙃-🙄]|[🙅-🙏]|[🚀-🛅]|[🛌]|[🛐]|[🛑-🛒]|[🛕]|[🛫-🛬]|[🛴-🛶]|[🛷-🛸]|[🛹]|[🛺]|[🟠-🟫]|[🤍-🤏]|[🤐-🤘]|[🤙-🤞]|[🤟]|[🤠-🤧]|[🤨-🤯]|[🤰]|[🤱-🤲]|[🤳-🤺]|[🤼-🤾]|[🤿]|[🥀-🥅]|[🥇-🥋]|[🥌]|[🥍-🥏]|[🥐-🥞]|[🥟-🥫]|[🥬-🥰]|[🥱]|[🥳-🥶]|[🥺]|[🥻]|[🥼-🥿]|[🦀-🦄]|[🦅-🦑]|[🦒-🦗]|[🦘-🦢]|[🦥-🦪]|[🦮-🦯]|[🦰-🦹]|[🦺-🦿]|[🧀]|[🧁-🧂]|[🧃-🧊]|[🧍-🧏]|[🧐-🧦]|[🧧-🧿]|[🩰-🩳]|[🩸-🩺]|[🪀-🪂]|[🪐-🪕]')">Text contains characters with Emoji presentation as default.</report>
                 </rule>
             </pattern>
-   <pattern id="schematron-constraint-wega_all-sourceMustResolve-85">
+   <pattern id="schematron-constraint-wega_all-sourceMustResolve-86">
                 <rule context="*[starts-with(@source, '#')]">
                     <let name="source" value="@source"/>
                     <assert test="id(substring($source,2))">Unable to locate the reference provided by the @source attribute.</assert>
                 </rule>
             </pattern>
-   <pattern id="schematron-constraint-wega_all-att.wega.rend-underline-n-86">
+   <pattern id="schematron-constraint-wega_all-att.wega.rend-underline-n-87">
                     <rule context="*:hi[@n] | *:rend[@n]">
                         <report test="@rend ne 'underline'">The @n-attribute is only supported in combination with @rend='underline'</report>
                     </rule>
diff --git a/schema/de/wega_all.rng b/schema/de/wega_all.rng
index ea0160c..608551f 100644
--- a/schema/de/wega_all.rng
+++ b/schema/de/wega_all.rng
@@ -5,7 +5,7 @@
          xmlns="http://relaxng.org/ns/structure/1.0"
          datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes"
          ns="http://www.tei-c.org/ns/1.0"><!--
-Schema generated from ODD source 2020-12-17T13:27:42Z. .
+Schema generated from ODD source 2021-01-13T21:21:10Z. .
 TEI Edition: Version 4.1.0. Last updated on
 	19th August 2020, revision b414ba550
 TEI Edition Location: https://www.tei-c.org/Vault/P5/Version 4.1.0/
@@ -7100,6 +7100,18 @@ Beispielwerte sind etwa: 1] explicit; 2] implicit</a:documentation>
                </choice>
             </oneOrMore>
          </group>
+         <pattern xmlns="http://purl.oclc.org/dsdl/schematron"
+                  id="wega_all-listWit-only-one-witness-constraint-report-51">
+            <rule context="tei:listWit">
+               <sch:report xmlns:mei="http://www.music-encoding.org/ns/mei"
+                           xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0"
+                           xmlns:s="http://www.ascc.net/xml/schematron"
+                           xmlns:sch="http://purl.oclc.org/dsdl/schematron"
+                           xmlns="http://www.tei-c.org/ns/1.0"
+                           xmlns:rng="http://relaxng.org/ns/structure/1.0"
+                           test="count(tei:witness) le 1">There should always be more than one witness within a listWit element.</sch:report>
+            </rule>
+         </pattern>
       </element>
    </define>
    <define name="witness">
@@ -7472,7 +7484,7 @@ Beispielwerte sind etwa: 1] explicit; 2] implicit</a:documentation>
             </optional>
          </group>
          <pattern xmlns="http://purl.oclc.org/dsdl/schematron"
-                  id="wega_all-div-abstractModel-structure-l-constraint-report-51">
+                  id="wega_all-div-abstractModel-structure-l-constraint-report-52">
             <rule context="tei:div">
                <report xmlns:sch="http://purl.oclc.org/dsdl/schematron"
                        xmlns:rng="http://relaxng.org/ns/structure/1.0"
@@ -7482,7 +7494,7 @@ Beispielwerte sind etwa: 1] explicit; 2] implicit</a:documentation>
             </rule>
          </pattern>
          <pattern xmlns="http://purl.oclc.org/dsdl/schematron"
-                  id="wega_all-div-abstractModel-structure-p-constraint-report-52">
+                  id="wega_all-div-abstractModel-structure-p-constraint-report-53">
             <rule context="tei:div">
                <report xmlns:sch="http://purl.oclc.org/dsdl/schematron"
                        xmlns:rng="http://relaxng.org/ns/structure/1.0"
diff --git a/schema/en/wegaDocuments.rng b/schema/en/wegaDocuments.rng
index 3dccdb3..7a5bfc1 100644
--- a/schema/en/wegaDocuments.rng
+++ b/schema/en/wegaDocuments.rng
@@ -5,7 +5,7 @@
          xmlns="http://relaxng.org/ns/structure/1.0"
          datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes"
          ns="http://www.tei-c.org/ns/1.0"><!--
-Schema generated from ODD source 2020-12-17T13:27:47Z. .
+Schema generated from ODD source 2021-01-13T21:38:55Z. .
 TEI Edition: Version 4.1.0. Last updated on
 	19th August 2020, revision b414ba550
 TEI Edition Location: https://www.tei-c.org/Vault/P5/Version 4.1.0/
@@ -5985,6 +5985,18 @@ Suggested values include: 1] label; 2] data</a:documentation>
                </choice>
             </oneOrMore>
          </group>
+         <pattern xmlns="http://purl.oclc.org/dsdl/schematron"
+                  id="wegaDocuments-listWit-only-one-witness-constraint-report-48">
+            <rule context="tei:listWit">
+               <sch:report xmlns:mei="http://www.music-encoding.org/ns/mei"
+                           xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0"
+                           xmlns:s="http://www.ascc.net/xml/schematron"
+                           xmlns:sch="http://purl.oclc.org/dsdl/schematron"
+                           xmlns="http://www.tei-c.org/ns/1.0"
+                           xmlns:rng="http://relaxng.org/ns/structure/1.0"
+                           test="count(tei:witness) le 1">There should always be more than one witness within a listWit element.</sch:report>
+            </rule>
+         </pattern>
       </element>
    </define>
    <define name="witness">
diff --git a/schema/en/wegaLetters.rng b/schema/en/wegaLetters.rng
index 1138771..c982cc2 100644
--- a/schema/en/wegaLetters.rng
+++ b/schema/en/wegaLetters.rng
@@ -5,7 +5,7 @@
          xmlns="http://relaxng.org/ns/structure/1.0"
          datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes"
          ns="http://www.tei-c.org/ns/1.0"><!--
-Schema generated from ODD source 2020-12-17T13:27:48Z. .
+Schema generated from ODD source 2021-01-13T21:38:56Z. .
 TEI Edition: Version 4.1.0. Last updated on
 	19th August 2020, revision b414ba550
 TEI Edition Location: https://www.tei-c.org/Vault/P5/Version 4.1.0/
@@ -6560,6 +6560,18 @@ Suggested values include: 1] label; 2] data</a:documentation>
                </choice>
             </oneOrMore>
          </group>
+         <pattern xmlns="http://purl.oclc.org/dsdl/schematron"
+                  id="wegaLetters-listWit-only-one-witness-constraint-report-50">
+            <rule context="tei:listWit">
+               <sch:report xmlns:mei="http://www.music-encoding.org/ns/mei"
+                           xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0"
+                           xmlns:s="http://www.ascc.net/xml/schematron"
+                           xmlns:sch="http://purl.oclc.org/dsdl/schematron"
+                           xmlns="http://www.tei-c.org/ns/1.0"
+                           xmlns:rng="http://relaxng.org/ns/structure/1.0"
+                           test="count(tei:witness) le 1">There should always be more than one witness within a listWit element.</sch:report>
+            </rule>
+         </pattern>
       </element>
    </define>
    <define name="witness">
diff --git a/schema/en/wegaWritings.rng b/schema/en/wegaWritings.rng
index c4fdd38..99322cf 100644
--- a/schema/en/wegaWritings.rng
+++ b/schema/en/wegaWritings.rng
@@ -5,7 +5,7 @@
          xmlns="http://relaxng.org/ns/structure/1.0"
          datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes"
          ns="http://www.tei-c.org/ns/1.0"><!--
-Schema generated from ODD source 2020-12-17T13:27:53Z. .
+Schema generated from ODD source 2021-01-13T21:39:02Z. .
 TEI Edition: Version 4.1.0. Last updated on
 	19th August 2020, revision b414ba550
 TEI Edition Location: https://www.tei-c.org/Vault/P5/Version 4.1.0/
@@ -5967,6 +5967,18 @@ Suggested values include: 1] label; 2] data</a:documentation>
                </choice>
             </oneOrMore>
          </group>
+         <pattern xmlns="http://purl.oclc.org/dsdl/schematron"
+                  id="wegaWritings-listWit-only-one-witness-constraint-report-48">
+            <rule context="tei:listWit">
+               <sch:report xmlns:mei="http://www.music-encoding.org/ns/mei"
+                           xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0"
+                           xmlns:s="http://www.ascc.net/xml/schematron"
+                           xmlns:sch="http://purl.oclc.org/dsdl/schematron"
+                           xmlns="http://www.tei-c.org/ns/1.0"
+                           xmlns:rng="http://relaxng.org/ns/structure/1.0"
+                           test="count(tei:witness) le 1">There should always be more than one witness within a listWit element.</sch:report>
+            </rule>
+         </pattern>
       </element>
    </define>
    <define name="witness">
diff --git a/schema/en/wega_all.rng b/schema/en/wega_all.rng
index ccee816..68ca46e 100644
--- a/schema/en/wega_all.rng
+++ b/schema/en/wega_all.rng
@@ -5,7 +5,7 @@
          xmlns="http://relaxng.org/ns/structure/1.0"
          datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes"
          ns="http://www.tei-c.org/ns/1.0"><!--
-Schema generated from ODD source 2020-12-17T13:27:53Z. .
+Schema generated from ODD source 2021-01-13T21:39:01Z. .
 TEI Edition: Version 4.1.0. Last updated on
 	19th August 2020, revision b414ba550
 TEI Edition Location: https://www.tei-c.org/Vault/P5/Version 4.1.0/
@@ -7100,6 +7100,18 @@ Sample values include: 1] explicit; 2] implicit</a:documentation>
                </choice>
             </oneOrMore>
          </group>
+         <pattern xmlns="http://purl.oclc.org/dsdl/schematron"
+                  id="wega_all-listWit-only-one-witness-constraint-report-51">
+            <rule context="tei:listWit">
+               <sch:report xmlns:mei="http://www.music-encoding.org/ns/mei"
+                           xmlns:a="http://relaxng.org/ns/compatibility/annotations/1.0"
+                           xmlns:s="http://www.ascc.net/xml/schematron"
+                           xmlns:sch="http://purl.oclc.org/dsdl/schematron"
+                           xmlns="http://www.tei-c.org/ns/1.0"
+                           xmlns:rng="http://relaxng.org/ns/structure/1.0"
+                           test="count(tei:witness) le 1">There should always be more than one witness within a listWit element.</sch:report>
+            </rule>
+         </pattern>
       </element>
    </define>
    <define name="witness">
@@ -7472,7 +7484,7 @@ Sample values include: 1] explicit; 2] implicit</a:documentation>
             </optional>
          </group>
          <pattern xmlns="http://purl.oclc.org/dsdl/schematron"
-                  id="wega_all-div-abstractModel-structure-l-constraint-report-51">
+                  id="wega_all-div-abstractModel-structure-l-constraint-report-52">
             <rule context="tei:div">
                <report xmlns:sch="http://purl.oclc.org/dsdl/schematron"
                        xmlns:rng="http://relaxng.org/ns/structure/1.0"
@@ -7482,7 +7494,7 @@ Sample values include: 1] explicit; 2] implicit</a:documentation>
             </rule>
          </pattern>
          <pattern xmlns="http://purl.oclc.org/dsdl/schematron"
-                  id="wega_all-div-abstractModel-structure-p-constraint-report-52">
+                  id="wega_all-div-abstractModel-structure-p-constraint-report-53">
             <rule context="tei:div">
                <report xmlns:sch="http://purl.oclc.org/dsdl/schematron"
                        xmlns:rng="http://relaxng.org/ns/structure/1.0"
diff --git a/src/Specs/common-specs.odd.xml b/src/Specs/common-specs.odd.xml
index f957bd0..3a4715b 100644
--- a/src/Specs/common-specs.odd.xml
+++ b/src/Specs/common-specs.odd.xml
@@ -3405,6 +3405,11 @@
                 <memberOf key="att.global" mode="delete"/>
                 <memberOf key="att.sortable" mode="delete"/>
             </classes>
+            <constraintSpec scheme="schematron" ident="only-one-witness">
+                <constraint>
+                    <sch:report test="count(tei:witness) le 1">There should always be more than one witness within a listWit element.</sch:report>
+                </constraint>
+            </constraintSpec>
         </elementSpec>
         
         <elementSpec ident="witness" mode="change" module="textcrit">