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Annotations

Schemas can be annotated with human or machine readable documentation and other information: 

<xsd:element name="author">
  <xsd:annotation>
    <xsd:documentation xmlns:xhtml="http://www.w3.org/1999/xhtml">
       the author of the recipe, 
       see <xhtml:a href="authors.xml">this list</xhtml:a> of authors
    </xsd:documentation>
    <xsd:appinfo xmlns:fp="http://foodprocessor.org">
       <fp:process type="117"/>
    </xsd:appinfo>
  </xsd:annotation>
  ...
</xsd:element>

Note that annotations can be structured, as opposed to simple <!-- ... --> XML comments.

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