Annotations

• An xsd:annotation element describes its parent element.

• A top-level xsd:annotation element describes the entire schema.

• Its xsd:documentation child element describes the schema for human readers.

• Its xsd:appInfo child element describes the schema for computer programs; e.g. stylesheet instructions.

<?xml version="1.0"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">

  <xsd:annotation>
    <xsd:documentation>
      Song schema example for XML Schemas tutorial
      Copyright 2001 Elliotte Rusty Harold. 
    </xsd:documentation>
  </xsd:annotation>
 
  <xsd:element name="SONG" type="SongType"/>

  <xsd:simpleType name="money">
    <xsd:restriction base="xsd:string">             
      <xsd:pattern value="\p{Sc}\p{Nd}+(\.\p{Nd}\p{Nd})?">
        <xsd:annotation>
          <xsd:documentation>
       \p{Sc}             Any Unicode currency indicator; e.g. $, &#xA5, &#xA3, &#A4, etc.
       \p{Nd}             A Unicode decimal digit character
       \p{Nd}+            One or more Unicode decimal digit characters
       \.                 The period character
       (\.\p{Nd}\p{Nd})
       (\.\p{Nd}\p{Nd})?  Zero or one strings of the form .35
       
       This works for any decimalized currency.           
          </xsd:documentation>
        </xsd:annotation>
      </xsd:pattern>
    </xsd:restriction>
  </xsd:simpleType>

  <xsd:complexType name="SongType">
    <xsd:sequence>
      <xsd:element name="TITLE"     type="xsd:string"/>
      <xsd:element name="COMPOSER"  type="xsd:string" 
        maxOccurs="unbounded"/>
      <xsd:element name="PRODUCER"  type="xsd:string" 
        minOccurs="0" maxOccurs="unbounded"/>
      <xsd:element name="PUBLISHER" type="xsd:string" 
        minOccurs="0"/>
      <xsd:element name="YEAR"   type="xsd:gYear"/>
      <xsd:element name="ARTIST" type="xsd:string" 
        maxOccurs="unbounded"/>
      <xsd:element name="PRICE" type="money"/>      
     </xsd:sequence> 
  </xsd:complexType>
  
</xsd:schema>