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dretblog.xmlXML in used in a wide variety of application scenarios, resulting in a wide variety of requirements. This lecture introduces the application example used in this course, which is the representation of blog data in XML. Blogs are a good example for XML, because of their mix of structured data (blog post metadata) and textual data (the actual blog post), the requirement to derive different views (such as weekly and monthly summaries) from the same set of data, and the requirement to make the data available in various output formats (such as HTML and RSS).
dretblog.xml<?xml version="1.0" encoding="UTF-8"?> <blogxml> <post date="2007-05-15"> <title>Half Dome</title> <text>The trip to half dome is a long one, but very beautiful and with a spectacular final climb.</text> <image src="half-dome">Me on top of half dome.</image> </post> <post date="2007-05-20"> <title>Fifth Lake</title> <text>The seven lakes loop offers views of (surprise!) seven lakes settled in a remote valley.</text> <image src="fifth-lake">Still a lot of ice on fifth lake.</image> </post> <post date="2007-05-22"> <title>Golden Canyon</title> <text>Golden Canyon leads to the famous Zabriskie Point overlook.</text> <image src="golden-canyon">A maze of erosion patterns carved in sediment.</image> </post> </blogxml>
<!ELEMENT blogxml (post+) > <!ELEMENT post (title, text, image) > <!ELEMENT title (#PCDATA) > <!ELEMENT text (#PCDATA) > <!ATTLIST post date CDATA #REQUIRED > <!ELEMENT image (#PCDATA) > <!ATTLIST image src CDATA #REQUIRED >
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name="blogxml">
<xs:complexType>
<xs:sequence>
<xs:element name="post" maxOccurs="unbounded">
<xs:complexType>
<xs:sequence>
<xs:element name="title" type="xs:string"/>
<xs:element name="text" type="xs:string"/>
<xs:element name="image">
<xs:complexType>
<xs:simpleContent>
<xs:extension base="xs:string">
<xs:attribute name="src" type="xs:anyURI"/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
</xs:element>
</xs:sequence>
<xs:attribute name="date" type="xs:date"/>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>
count(//post)
//post[2]/title
for $i in //post return days-from-duration(xs:date($i/@date) - xs:date($i/preceding-sibling::post[1]/@date))
for $i in //post return days-from-duration(xs:date(//post[last()]/@date) - xs:date($i/@date))
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="/">
<html>
<body>
<table border="1" cellpadding="20">
<xsl:for-each select="//post">
<tr>
<td><a href="../img/{image/@src}.jpg"><img src="../img/{image/@src}-small.jpg"/></a></td>
<td>
<h2><xsl:value-of select="format-date(@date, '[F] [MNn] [D], [Y]')"/>: <xsl:value-of select="title"/></h2>
<p><xsl:value-of select="text"/></p>
</td>
</tr>
</xsl:for-each>
</table>
</body>
</html>
</xsl:template>
</xsl:stylesheet><html>
<body>
<table border="1" cellpadding="20">
<tr>
<td><a href="../img/half-dome.jpg"><img src="../img/half-dome-small.jpg"></a></td>
<td>
<h2>Tuesday May 15, 2007: Half Dome</h2>
<p>The trip to half dome is a long one, but very beautiful and with a spectacular final climb.</p>
</td>
</tr><?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="/">
<html>
<body>
<h1>dretblog</h1>
<xsl:for-each select="//post">
<p><a href="{@date}"><xsl:value-of select="concat(format-date(@date, '[F] [MNn] [D], [Y]'), ': ', title)"/></a></p>
</xsl:for-each>
</body>
</html>
<xsl:for-each select="//post">
<xsl:result-document href="{@date}.html">
<html>
<body>
<h1><xsl:value-of select="title"/></h1>
<h2><xsl:value-of select="format-date(@date, '[F] [MNn] [D], [Y]')"/></h2>
<a href="../img/{image/@src}.jpg" title="{image}"><img src="../img/{image/@src}-small.jpg"/></a>
<p><xsl:value-of select="text"/></p>
<p>
<xsl:if test="exists(preceding-sibling::post)"><a href="{preceding-sibling::post[1]/@date}">← </a></xsl:if>
<a href="dretblog2">Home</a>
<xsl:if test="exists(following-sibling::post)"><a href="{following-sibling::post[1]/@date}"> →</a></xsl:if>
</p>
</body>
</html>
</xsl:result-document>
</xsl:for-each>
</xsl:template>
</xsl:stylesheet><html>
<body>
<p><a href="2007-05-15">Tuesday May 15, 2007: Half Dome</a></p>
<p><a href="2007-05-20">Sunday May 20, 2007: Fifth Lake</a></p>
<p><a href="2007-05-22">Tuesday May 22, 2007: Golden Canyon</a></p>
</body>
</html><html>
<body>
<h1>Half Dome</h1>
<h2>Tuesday May 15, 2007</h2>
<a href="../img/half-dome.jpg" title="Me on top of half dome."><img src="../img/half-dome-small.jpg"></a>
<p>The trip to half dome is a long one, but very beautiful and with a spectacular final climb.</p>
<p><a href="dretblog2">Home</a><a href="2007-05-20"> →</a></p>
</body>
</html><?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="/">
<feed xmlns="http://www.w3.org/2005/Atom" xml:base="http://dret.net/lectures/xml-fall07/src/dretblog.atom">
<title>dretblog</title>
<id>http://dret.net/lectures/xml-fall07/src/dretblog.atom</id>
<link rel="self" href=""/>
<updated><xsl:value-of select="current-dateTime()"/></updated>
<author><name>Erik Wilde</name></author>
<xsl:for-each select="//post">
<entry xml:base="http://dret.net/lectures/xml-fall07/src/{@date}">
<title><xsl:value-of select="title"/></title>
<link href="http://dret.net/lectures/xml-fall07/src/{@date}"/>
<id><xsl:value-of select="concat('http://dret.net/lectures/xml-fall07/src/', @date)"/></id>
<published><xsl:value-of select="@date"/>T00:00:00Z</published>
<updated><xsl:value-of select="current-dateTime()"/></updated>
<content type="xhtml">
<div xmlns="http://www.w3.org/1999/xhtml">
<h1><xsl:value-of select="title"/></h1>
<h2><xsl:value-of select="format-date(@date, '[F] [MNn] [D], [Y]')"/></h2>
<a href="http://dret.net/lectures/xml-fall07/img/{image/@src}.jpg" title="{image}"><img src="http://dret.net/lectures/xml-fall07/img/{image/@src}-small.jpg"/></a>
<p><xsl:value-of select="text"/></p>
</div>
</content>
</entry>
</xsl:for-each>
</feed>
</xsl:template>
</xsl:stylesheet><feed xmlns="http://www.w3.org/2005/Atom" xml:base="http://dret.net/lectures/xml-fall07/src/dretblog.atom">
<title>dretblog</title>
<id>http://dret.net/lectures/xml-fall07/src/dretblog.atom</id>
<link rel="self" href=""/>
<updated>2007-08-27T15:34:31.359-07:00</updated>
<author>
<name>Erik Wilde</name>
</author>
<entry xml:base="http://dret.net/lectures/xml-fall07/src/2007-05-15">
<title>Half Dome</title>
<link href="http://dret.net/lectures/xml-fall07/src/2007-05-15"/>
<id>http://dret.net/lectures/xml-fall07/src/2007-05-15</id>
<published>2007-05-15T00:00:00Z</published>
<updated>2007-08-27T15:34:31.359-07:00</updated>
<content type="xhtml">
<div xmlns="http://www.w3.org/1999/xhtml">
<h1>Half Dome</h1>
<h2>Tuesday May 15, 2007</h2>
<a href="http://dret.net/lectures/xml-fall07/img/half-dome.jpg" title="Me on top of half dome.">
<img src="http://dret.net/lectures/xml-fall07/img/half-dome-small.jpg"/>
</a>
<p>The trip to half dome is a long one, but very beautiful and with a spectacular final climb.</p>
</div>
</content>
</entry>