2008-12-15 Xml, future of the past

2008-12-15 xml-future-of-the-past

# Title: Xml, future of the past
# Author: Mikael Lundin
# Link: http://blog.mikaellundin.name/2008/12/15/xml-future-of-the-past.html

bookstore.dtd

<!ELEMENT bookstore (authors,books)>

<!-- AUTHORS -->
<!ELEMENT authors (author*)>
<!ELEMENT author (firstname,lastname)>
<!ATTLIST author id ID #REQUIRED>

<!ELEMENT firstname (#PCDATA)>
<!ELEMENT lastname (#PCDATA)>

<!-- BOOKS -->
<!ELEMENT books (book*)>
<!ELEMENT book (authors-ref,price,plot)>
<!ATTLIST book isbn ID #REQUIRED>

<!ELEMENT title (#PCDATA)>
<!ELEMENT authors-ref EMPTY>
<!ATTLIST authors-ref values IDREFS #REQUIRED>

<!ELEMENT price EMPTY>
<!ATTLIST price sek CDATA #IMPLIED>
<!ATTLIST price usd CDATA #IMPLIED>
<!ATTLIST price eur CDATA #IMPLIED>

<!ELEMENT plot (#PCDATA)>

bookstore.xml

<?xml version="1.0" encoding="utf-8" standalone="yes" ?> 
<bookstore>
 <authors>
  <author id="janeausten">
   <firstname>Jane</firstname>
   <lastname>Austen</lastname>
  </author>
 </authors>
 <books>
  <book isbn="ISBN-9781853260001">
   <title>Pride and Prejudice</title>
   <authors-ref values="janeausten" />
   <price sek="79" />
   <plot><![CDATA[Pride and Prejudice is the story of Mr and Mrs Bennet (minor gentry), their five daughters, and the various romantic adventures at their Hertfordshire residence of Longbourn....]]></plot>
  </book>
 </books>
</bookstore>

bookstore.xsd

<?xml version="1.0" encoding="utf-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://mint.litemedia.se" targetNamespace="http://mint.litemedia.se" elementFormDefault="qualified">

 <!-- ROOT ELEMENT -->
 <xs:element name="bookstore">
  <xs:complexType>
   <xs:sequence>
    <xs:element name="authors">
     <xs:complexType>
      <xs:sequence>
       <xs:element name="author" type="author" maxOccurs="unbounded">
       </xs:element>       
      </xs:sequence>
     </xs:complexType>
    </xs:element>
    <xs:element name="books">
     <xs:complexType>
      <xs:sequence>
       <xs:element name="book" type="book" maxOccurs="unbounded">
       </xs:element>
      </xs:sequence>
     </xs:complexType>
    </xs:element>
   </xs:sequence>
  </xs:complexType>
  
  <!-- KEYS -->
  <xs:keyref name="author-ref" refer="author-id">
   <xs:selector xpath="books/book/author-ref"/>
   <xs:field xpath="@values"/>
  </xs:keyref>
  
  <xs:unique  name="author-id">
   <xs:selector xpath="authors/author"/>
   <xs:field xpath="@id"/>
  </xs:unique>
  
  <xs:unique name="book-isbn">
   <xs:selector xpath="books/book"/>
   <xs:field xpath="@isbn"/>
  </xs:unique>
 </xs:element>

 <!-- AUTHOR TYPE -->
 <xs:complexType name="author">
  <xs:all>
   <xs:element name="firstname" type="xs:string"/>
   <xs:element name="lastname" type="xs:string"/>
  </xs:all>
  <xs:attribute name="id" type="xs:string" use="required"/>
 </xs:complexType>

 <!-- BOOK TYPE -->
 <xs:complexType name="book">
  <xs:sequence>
   <xs:element name="title" type="xs:string"/>
   <xs:element name="authors-ref">
    <xs:complexType>
     <xs:attribute name="values" type="xs:string"/>
    </xs:complexType>
   </xs:element>
   <xs:element name="price">
    <xs:complexType>
     <xs:attribute name="sek" type="xs:positiveInteger"/>
    </xs:complexType>
   </xs:element>
   <xs:element name="plot">
    <xs:simpleType>
     <xs:restriction base="xs:string">
      <xs:whiteSpace value="preserve"/>
     </xs:restriction>
    </xs:simpleType>
   </xs:element>
  </xs:sequence>
  <xs:attribute name="isbn">
   <xs:simpleType>
    <xs:restriction base="xs:string">
     <xs:pattern value="ISBN-[\d]*"/>
    </xs:restriction>
   </xs:simpleType>
  </xs:attribute>
 </xs:complexType>
</xs:schema>

bookstore.xsl

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="2.0" 
    xmlns:xsl="http://www.w3.org/1999/XSL/Transform" 
    xmlns:fo="http://www.w3.org/1999/XSL/Format" 
    xmlns:xs="http://www.w3.org/2001/XMLSchema" 
    xmlns:fn="http://www.w3.org/2005/xpath-functions" 
    xmlns:mint="http://mint.litemedia.se">
 
 <xsl:output encoding="utf-8" indent="yes" method="xhtml" />
 <xsl:output doctype-system="http://www.w3c.org/tr/html4/strict.dtd"/> 
 <xsl:output doctype-public="-//W3c//DTD HTML 4.01//EN"/> 

 <xsl:template match="/">
  <html>
   <head>
    <title>Bookstore</title>
    <link rel="stylesheet" href="style.css" type="text/css" media="screen" />
   </head>
   <body>
    <h1>Bookstore</h1>
    <ul class="books">
     <xsl:apply-templates select="/mint:bookstore/mint:books/*" />
    </ul>
   </body>
  </html>
 </xsl:template>
 
 <xsl:template match="mint:book">
  <li class="book">
   <h2><xsl:value-of select="mint:title"/></h2>
   <em>by</em><xsl:value-of select="id(mint:authors-ref/@values)" />
   <p>
    Plot: <xsl:value-of select="mint:plot" />
   </p>
  </li>
 </xsl:template>
</xsl:stylesheet>