xsl:char 

A string containing exactly one character.

Simple Type Information

Used By

Attributes xsl:decimal-format/@decimal-separator, xsl:decimal-format/@digit, xsl:decimal-format/@grouping-separator, xsl:decimal-format/@minus-sign, xsl:decimal-format/@pattern-separator, xsl:decimal-format/@per-mille, xsl:decimal-format/@percent, xsl:decimal-format/@zero-digit, xsl:output-character/@character

Source 

<xs:simpleType name="char">
  <xs:annotation>
    <xs:documentation>A string containing exactly one character.</xs:documentation>
  </xs:annotation>
  <xs:restriction base="xs:string">
    <xs:length value="1"/>
  </xs:restriction>
</xs:simpleType>