XML Schema documentation 元素

<documentation
source=URI reference
xml:lang=language>

Any well-formed XML content

</documentation>

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">

<xs:annotation>
  <xs:appinfo>W3CSchool Note</xs:appinfo>
  <xs:documentation xml:lang="en">
  This Schema defines a W3CSchool note!
  </xs:documentation>
</xs:annotation>

.
.
.

</xs:schema>