Character 

a single character, as per section 2.2 of [XML]

Simple Type Information

Used By

Attributes cellhalign/@char, focus/@accesskey, label/@accesskey, legend/@accesskey

Source 

<xs:simpleType name="Character">
  <xs:annotation>
    <xs:documentation>a single character, as per section 2.2 of [XML]</xs:documentation>
  </xs:annotation>
  <xs:restriction base="xs:string">
    <xs:length value="1" fixed="true"/>
  </xs:restriction>
</xs:simpleType>