<attList>

<attList> (attribute list) contains documentation for all the attributes associated with this element, as a series of attDef elements. [23.5 Element Specifications 23.6 Class Specifications]
Module tagdocs — Documentation Elements
Attributes
org⚓︎ (organization) specifies whether only one (choice) or all (group) of the attributes in the list are available.
Status Optional
Datatype teidata.enumerated
Legal values are:
group
grouped [Default]
choice
alternated
Contained by
tagdocs: attList classSpec elementSpec
May contain
tagdocs: attDef attList attRef
Example
<attList>
 <attDef ident="type" usage="opt">
  <desc>type of schema</desc>
  <datatype>
   <dataRef key="teidata.enumerated"/>
  </datatype>
 </attDef>
</attList>
Example
<attList org="choice">
 <attDef ident="active">
  <desc versionDate="2005-07-24"
   xml:lang="en">identifies the <soCalled>active</soCalled> participants in a non-mutual relationship, or all the participants in a mutual one.</desc>
  <datatype maxOccurs="unbounded">
   <dataRef key="teidata.pointer"/>
  </datatype>
 </attDef>
 <attDef ident="mutual" usage="opt">
  <desc versionDate="2005-07-24"
   xml:lang="en">supplies a list
     of participants amongst all of whom the relationship holds
     equally.</desc>
  <datatype maxOccurs="unbounded">
   <dataRef key="teidata.pointer"/>
  </datatype>
 </attDef>
</attList>
Schematron Because it is illegal in XML to have two attributes with the same name on the same element instance, it is illegal in TEI to have two attDef elements with the same values of ns and ident in a single attList, unless the parent attList has an org of choice. This applies regardless of the mode of each attDef.

<sch:rule context="tei:attList[ not( ancestor::tei:attList ) ]">

<sch:let name="notanamespace" value="'☮🄯'"/>

<sch:let name="defs"
 value="descendant::tei:attDef"/>

<sch:let name="nsidents"
 value="for $ad in $defs return if ( $ad[ parent::tei:attList[ @org eq 'choice'] and preceding-sibling::tei:attDef[ @ident eq $ad/@ident and ( @ns, $notanamespace )[1] eq ( $ad/@ns, $notanamespace )[1] ] ] ) then '' else normalize-space( if ($ad/@ns) then 'Q{'||$ad/@ns||'}'||$ad/@ident else $ad/@ident ) "/>

<sch:let name="dups"
 value="for $a in $nsidents return ( $nsidents[ . eq $a ][2] )"/>

<sch:let name="distinct_dups"
 value="distinct-values( $dups )"/>

<sch:assert test="count( $distinct_dups[ . ne ''] ) eq 0"> Within the attribute list defined in <sch:value-of select="ancestor::*[@ident][1]/@ident"/>,
the following attributes have been defined multiple times: <sch:value-of select="$distinct_dups"/>.
</sch:assert>
</sch:rule>
Content model 
<content>
 <alternate minOccurs="1"
  maxOccurs="unbounded">
  <elementRef key="attRef"/>
  <elementRef key="attDef"/>
  <elementRef key="attList"/>
 </alternate>
</content>
Schema Declaration 
<rng:element name="attList">
 <rng:ref name="att.global.attributes"/>
 <rng:ref name="att.global.analytic.attributes"/>
 <rng:ref name="att.global.change.attributes"/>
 <rng:ref name="att.global.facs.attributes"/>
 <rng:ref name="att.global.linking.attributes"/>
 <rng:ref name="att.global.rendition.attributes"/>
 <rng:ref name="att.global.responsibility.attributes"/>
 <rng:ref name="att.global.source.attributes"/>
 <rng:optional>
  <rng:attribute name="org"
   a:defaultValue="group">
   <rng:choice>
    <rng:value>group</rng:value>
    <rng:value>choice</rng:value>
   </rng:choice>
  </rng:attribute>
 </rng:optional>
 <rng:oneOrMore>
  <rng:choice>
   <rng:ref name="attRef"/>
   <rng:ref name="attDef"/>
   <rng:ref name="attList"/>
  </rng:choice>
 </rng:oneOrMore>
</rng:element>
element attList
{
   att.global.attributes,
   att.global.analytic.attributes,
   att.global.change.attributes,
   att.global.facs.attributes,
   att.global.linking.attributes,
   att.global.rendition.attributes,
   att.global.responsibility.attributes,
   att.global.source.attributes,
   attribute org { "group" | "choice" }?,
   ( attRef | attDef | attList )+
}