計算機とその周辺: What I Talk About When I Talk About Computers: 4月 2011

2011年4月30日土曜日

[XML VQG] 2. XSLT (6)

First example.


$ cat 02-01.xml
<?xml version="1.0"?>

<?xml-stylesheet type="text/xsl" href="02-03.xsl"?>

<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
         xmlns:v="http://www.w3.org/2006/vcard/ns#">
           
  <v:VCard rdf:about = "http://example.com/me/corky" >
    <v:n>Corky Crystal</v:n>
    <v:fn>Corky Crystal</v:fn>
    <v:sound>
         <rdf:Description>
            <rdf:value>Corky</rdf:value>
            <rdf:type rdf:resource="@@@X-irmc-n@@@"/>
         </rdf:Description>
    </v:sound>
    <v:sort-string>Corky</v:sort-string>
         <v:x-phonetic-first-name>Corky</v:x-phonetic-first-name>
         <v:x-phonetic-last-name>Crystal</v:x-phonetic-last-name>
    <v:tel>
      <rdf:Description>  
        <rdf:value>+61 7 5555 5555</rdf:value>
        <rdf:type rdf:resource="http://www.w3.org/2006/vcard/ns#Home"/>
        <rdf:type rdf:resource="http://www.w3.org/2006/vcard/ns#Voice"/>
      </rdf:Description>  
    </v:tel>
    <v:email rdf:resource="mailto:corky@example.com"/>
    <v:adr>
      <rdf:Description>  
        <v:street-address>111 Lake Drive</v:street-address>
        <v:locality>WonderCity</v:locality>
        <v:postal-code>5555</v:postal-code>
        <v:country-name>Australia</v:country-name>
        <rdf:type rdf:resource="http://www.w3.org/2006/vcard/ns#Home"/>
      </rdf:Description>  
    </v:adr>
  </v:VCard>
</rdf:RDF>


$ cat 02-03.xsl
<?xml version="1.0"?>

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0"
  xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
  xmlns:v="http://www.w3.org/2006/vcard/ns#">

  <xsl:template match="/">
    <html><head><title>Addresses of World VIPs</title></head>
    <body>
      <h1>Addresses of World VIPs</h1>
      <xsl:value-of select="rdf:RDF/v:VCard/v:n"/>
      lives in
      <xsl:value-of select="rdf:RDF/v:VCard/v:adr/rdf:Description/v:street-address"/>,<br/>
      <xsl:value-of select="rdf:RDF/v:VCard/v:adr/rdf:Description/v:locality"/>,<br/>
      <xsl:value-of select="rdf:RDF/v:VCard/v:adr/rdf:Description/v:postal-code"/>,<br/>
      <xsl:value-of select="rdf:RDF/v:VCard/v:adr/rdf:Description/v:country-name"/>.
    </body>
    </html>
  </xsl:template>
</xsl:stylesheet>


$ java -cp ~/Dropbox/java/lib/saxon9he.jar net.sf.saxon.Transform -t -s:02-01.xml -xsl:02-03.xsl
Saxon-HE 9.3.0.4J from Saxonica
Java version 1.6.0_24
Warning: at xsl:stylesheet on line 5 column 46 of 02-03.xsl:
  Running an XSLT 1 stylesheet with an XSLT 2 processor
Stylesheet compilation time: 387 milliseconds
Processing file:/Volumes/Macintosh%20HD2/Dropbox/xml/02-01.xml
Using parser com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser
Building tree for file:/Volumes/Macintosh%20HD2/Dropbox/xml/02-01.xml using class net.sf.saxon.tree.tiny.TinyBuilder
Tree built in 2 milliseconds
Tree size: 70 nodes, 100 characters, 6 attributes
<html xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:v="http://www.w3.org/2006/vcard/ns#">
   <head>
      <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
      <title>Addresses of World VIPs</title>
   </head>
   <body>
      <h1>Addresses of World VIPs</h1>Corky Crystal
      lives in
      111 Lake Drive,<br>WonderCity,<br>5555,<br>Australia.
      
   </body>
</html>Execution time: 52ms
Memory used: 21394744
NamePool contents: 35 entries in 34 chains. 8 prefixes, 8 URIs
$

[XML VQG] 2. XSLT (5)

Let's resume learning XSLT. I should start from clarify the basic terminology of XSLT.

XSL: eXtensible Stylesheet Language

XSL is a specification that provides several methods to format XML documents.
W3C divided XSL into two parts:
- XSLT: XSL Transformations
  
  Typically used when transforming XML documents into another XML documents or HTML documents. Some web browsers are capable of formatting XML files with XSLT.
  
  An XSLT processor transforms an XML document with an XSLT style sheet document.
  
  The XSLT style sheet contains templates that define instructions on how to transform nodes in the XML document.
- XSL-FO: XSL Formatting Objects
  
  Typically used when transforming XML files into PDF files directly. No browser can deal with XSL-FO, so it needs dedicated application.

2011年4月24日日曜日

[XML VQG] 2. XSLT (4)

Most important thing is always data.

I consuleted VIP ADDRESS to create following RDF vCard example.


<?xml version="1.0"?>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
         xmlns:v="http://www.w3.org/2006/vcard/ns#">
           
  <v:VCard rdf:about = "http://example.com/me/corky" >
    <v:n>Corky Crystal</v:n>
    <v:fn>Corky Crystal</v:fn>
    <v:sound>
         <rdf:Description>
            <rdf:value>Corky</rdf:value>
            <rdf:type rdf:resource="@@@X-irmc-n@@@"/>
         </rdf:Description>
    </v:sound>
    <v:sort-string>Corky</v:sort-string>
         <v:x-phonetic-first-name>Corky</v:x-phonetic-first-name>
         <v:x-phonetic-last-name>Crystal</v:x-phonetic-last-name>
    <v:tel>
      <rdf:Description>  
        <rdf:value>+61 7 5555 5555</rdf:value>
        <rdf:type rdf:resource="http://www.w3.org/2006/vcard/ns#Home"/>
        <rdf:type rdf:resource="http://www.w3.org/2006/vcard/ns#Voice"/>
      </rdf:Description>  
    </v:tel>
    <v:email rdf:resource="mailto:corky@example.com"/>
    <v:adr>
      <rdf:Description>  
        <v:street-address>111 Lake Drive</v:street-address>
        <v:locality>WonderCity</v:locality>
        <v:postal-code>5555</v:postal-code>
        <v:country-name>Australia</v:country-name>
        <rdf:type rdf:resource="http://www.w3.org/2006/vcard/ns#Home"/>
      </rdf:Description>  
    </v:adr>
  </v:VCard>
  <v:VCard rdf:about = "http://example.com/me/al" >
    <v:n>Al Pacino</v:n>
    <v:fn>Al Pacino</v:fn>
    <v:sound>
         <rdf:Description>
            <rdf:value>Al</rdf:value>
            <rdf:type rdf:resource="@@@X-irmc-n@@@"/>
         </rdf:Description>
    </v:sound>
    <v:sort-string>Al</v:sort-string>
         <v:x-phonetic-first-name>Al</v:x-phonetic-first-name>
         <v:x-phonetic-last-name>Pacino</v:x-phonetic-last-name>
    <v:tel>
      <rdf:Description>  
        <rdf:value>+61 7 6666 6666</rdf:value>
        <rdf:type rdf:resource="http://www.w3.org/2006/vcard/ns#Home"/>
        <rdf:type rdf:resource="http://www.w3.org/2006/vcard/ns#Voice"/>
      </rdf:Description>  
    </v:tel>
    <v:email rdf:resource="mailto:al@example.com"/>
    <v:adr>
      <rdf:Description>  
        <v:street-address>301 West 57th Street, 16C</v:street-address>
        <v:locality>New York</v:locality>
        <v:region>New York</v:region>
        <v:postal-code>10017</v:postal-code>
        <v:country-name>USA</v:country-name>
        <rdf:type rdf:resource="http://www.w3.org/2006/vcard/ns#Home"/>
      </rdf:Description>  
    </v:adr>
  </v:VCard>
  <v:VCard rdf:about = "http://example.com/me/ethan" >
    <v:n>Ethan Hawke</v:n>
    <v:fn>Ethan Hawke</v:fn>
    <v:sound>
         <rdf:Description>
            <rdf:value>Ethan</rdf:value>
            <rdf:type rdf:resource="@@@X-irmc-n@@@"/>
         </rdf:Description>
    </v:sound>
    <v:sort-string>Al</v:sort-string>
         <v:x-phonetic-first-name>Ethan</v:x-phonetic-first-name>
         <v:x-phonetic-last-name>Hawke</v:x-phonetic-last-name>
    <v:tel>
      <rdf:Description>  
        <rdf:value>+61 7 7777 7777</rdf:value>
        <rdf:type rdf:resource="http://www.w3.org/2006/vcard/ns#Home"/>
        <rdf:type rdf:resource="http://www.w3.org/2006/vcard/ns#Voice"/>
      </rdf:Description>  
    </v:tel>
    <v:email rdf:resource="mailto:ethan@example.com"/>
    <v:adr>
      <rdf:Description>  
        <v:street-address>c/o 1775 Broadway 701</v:street-address>
        <v:locality>New York</v:locality>
        <v:region>New York</v:region>
        <v:postal-code>10019</v:postal-code>
        <v:country-name>USA</v:country-name>
        <rdf:type rdf:resource="http://www.w3.org/2006/vcard/ns#Home"/>
      </rdf:Description>  
    </v:adr>
  </v:VCard>
  <v:VCard rdf:about = "http://example.com/me/brad" >
    <v:n>Brad Pitt</v:n>
    <v:fn>Brad Pitt</v:fn>
    <v:sound>
         <rdf:Description>
            <rdf:value>Brad</rdf:value>
            <rdf:type rdf:resource="@@@X-irmc-n@@@"/>
         </rdf:Description>
    </v:sound>
    <v:sort-string>Al</v:sort-string>
         <v:x-phonetic-first-name>Brad</v:x-phonetic-first-name>
         <v:x-phonetic-last-name>Pitt</v:x-phonetic-last-name>
    <v:tel>
      <rdf:Description>  
        <rdf:value>+61 7 8888 8888</rdf:value>
        <rdf:type rdf:resource="http://www.w3.org/2006/vcard/ns#Home"/>
        <rdf:type rdf:resource="http://www.w3.org/2006/vcard/ns#Voice"/>
      </rdf:Description>  
    </v:tel>
    <v:email rdf:resource="mailto:brad@example.com"/>
    <v:adr>
      <rdf:Description>  
        <v:street-address>9150 Wilshire Boulevard Suite 350</v:street-address>
        <v:locality>Beverly Hills</v:locality>
        <v:region>California</v:region>
        <v:postal-code>90212</v:postal-code>
        <v:country-name>USA</v:country-name>
        <rdf:type rdf:resource="http://www.w3.org/2006/vcard/ns#Home"/>
      </rdf:Description>  
    </v:adr>
  </v:VCard>
</rdf:RDF>

2011年4月23日土曜日

[XML VQG] 2. XSLT (3)

I've finished creating my example related to vCard and RDF.

Original vCard


BEGIN:VCARD
VERSION:3.0
N:Corky Crystal
FN:Corky Crystal
SOUND;X-IRMC-N:Corky;
SORT-STRING:Corky
X-PHONETIC-FIRST-NAME:Corky
X-PHONETIC-LAST-NAME:Crystal
TEL;HOME;VOIDE:+61 7 5555 5555
EMAIL:corky@example.com
ADR;HOME:;;111 Lake Drive;WonderCity;;5555;Australia
END:VCARD

RDF vCard


<?xml version="1.0"?>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
         xmlns:v="http://www.w3.org/2006/vcard/ns#">
           
  <v:VCard rdf:about = "http://example.com/me/corky" >
    <v:n>Corky Crystal</v:n>
    <v:fn>Corky Crystal</v:fn>
    <v:sound>
         <rdf:Description>
            <rdf:value>Corky</rdf:value>
            <rdf:type rdf:resource="@@@X-irmc-n@@@"/>
         </rdf:Description>
    </v:sound>
    <v:sort-string>Corky</v:sort-string>
         <v:x-phonetic-first-name>Corky</v:x-phonetic-first-name>
         <v:x-phonetic-last-name>Crystal</v:x-phonetic-last-name>
    <v:tel>
      <rdf:Description>  
        <rdf:value>+61 7 5555 5555</rdf:value>
        <rdf:type rdf:resource="http://www.w3.org/2006/vcard/ns#Home"/>
        <rdf:type rdf:resource="http://www.w3.org/2006/vcard/ns#Voice"/>
      </rdf:Description>  
    </v:tel>
    <v:email rdf:resource="mailto:corky@example.com"/>
    <v:adr>
      <rdf:Description>  
        <v:street-address>111 Lake Drive</v:street-address>
        <v:locality>WonderCity</v:locality>
        <v:postal-code>5555</v:postal-code>
        <v:country-name>Australia</v:country-name>
        <rdf:type rdf:resource="http://www.w3.org/2006/vcard/ns#Home"/>
      </rdf:Description>  
    </v:adr>
  </v:VCard>
</rdf:RDF>

2011年4月12日火曜日

I was a bit disappointed at realizing that Google Chrome can't handle xml files with xsl. Safari can handle them.
And emacs seems to lack XML related tools, because there are no good elisps to deal with even XSLT.

Here, how to use Saxon on cui to run the examples in the book.


bash-3.2$ java -cp ~/Dropbox/java/lib/saxon9he.jar net.sf.saxon.Transform -t -s:02-01.xml -xsl:02-03.xsl
Saxon-HE 9.3.0.4J from Saxonica
Java version 1.6.0_24
Warning: at xsl:stylesheet on line 2 column 80 of 02-03.xsl:
  Running an XSLT 1 stylesheet with an XSLT 2 processor
Stylesheet compilation time: 3222 milliseconds
Processing file:/Volumes/Macintosh%20HD2/Dropbox/programming/xml-visual-quickstart-guide/Chapter_02_examples/02-01.xml
Using parser com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser
Building tree for file:/Volumes/Macintosh%20HD2/Dropbox/programming/xml-visual-quickstart-guide/Chapter_02_examples/02-01.xml using class net.sf.saxon.tree.tiny.TinyBuilder
Tree built in 1 milliseconds
Tree size: 16 nodes, 32 characters, 1 attributes
<html>
   <head>
      <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
      <title>Wonders of the World</title>
   </head>
   <body>
      <h1>Wonders of the World</h1>
      
      
      
      The Colossus of Rhodes
      is located in Rhodes, Greece.
      
      
   </body>
</html>Execution time: 320ms
Memory used: 21579320
NamePool contents: 19 entries in 19 chains. 6 prefixes, 6 URIs
bash-3.2$

Hum, XSLT files are in the end XML files, and it must be well-formed. That kind of restriction must be not adequate as a template language.

As the content of sample xml files, ancient wonders are boring. So I'd better create my examples.

I've thought about which kind of data I should deal with as my own examples, and I realized that the address data would be fine with me. I'll adopt vCard objects in RDF as the xml vocabulary. [Representing vCard Objects in RDF]
And you can also check what the vCard data in the wild are in my wiki entry. [aka:アドレス帳]

2011年4月9日土曜日

[XML VQG] 2. XSLT (1)

In this chapter, I should build xslt processing environment on my computer. I always prefer emacs as my kitchen sink, and found an minor-mode that interfaces with java xslt processors. [XSLT-process]

XSLT-process seems a frontend and it needs at least an xslt processor as its backend. I chose saxon as my xslt processor. [installation note]

2011年4月6日水曜日

[XML VQG] 1. Writing XML

On writing previous entry, I felt that taking-a-note style was not appropriate for this tiny but well-written book. Because my entry looks containing too much original content and I can't help feeling sorry to the authors... Well, I'd like to change the style of writing, so that my entries contain only what I myself felt or thought about the topics that comes from the book.

BTW, Part 1 'XML' contains only one chapter 'Writing XML', and it's well written for real beginners. Expressions, explanations and orders of material seems well considered. But I've got no new knowledge from this part.

2011年4月5日火曜日

[XML VQG] (Introductory sections)

Introduction
- HTML is the first language of the web, and XML is the second language.
- "HTML was designed to display information, XML was designed to manage it."
What is XML?
- XML is a specification for;
  - storing information,
  - describing the structure of the information.
- Here, the author try to explain these two points with a tiny example of XML documents. I felt something not so comfortable with the author's attitude, i.e. the author didn't mention explicitly the fact that the meaning of the tag or the information completely depends on the vocabulary of English (as a natural language).
- In the end, XML is a set of rules for defining new markup languages whatever you like. This reminds me of FOL.
The Power of XML
- XML suits for storing and carrying information, more that HTML do.
- XML is easily extended and adapted, as compared with HTML.
- XML document is simply a text file.
- XML is open standard.
Extending XML
- XML tags have no inherent formatting.
- We have to define how to display it using other facility like XML (eXtensible Stylesheet Language).
- XSL is composed of three parts;
  - XSLT
  - XPath
  - XSL-FO
- There are also several ways to define the structures of XML document. DTD, XML Schema language and so on. We can use XML Namespace to extend XML Schema.
XML in Practice
- RSS and Ajax are the good examples on how to use XML in practice.
About This Book
- A Guided Tour
- XML2e Companion Web Site (http://www.kehogo.com/xml2e)
- From 2001 to 2008
What This Book is Not
- This book is not exhaustive but introductory.

Oops. Learning something related to programming made me happy.

[XML VQG] Learning again?

I've been quite busy to learn English and doing many activities in international businesses.
In the mean time, I've always felt that I'd like to learn programming at the same time, but I couldn't.

Now I want to try again to learn it.

I selected XML as the subject for this trial. I'm still not sure I could continue to learn something regarding programming in my current situation, because my skill of English is not yet sufficient and needs a lot of time to improve it.

Any way, I'll try.

This time, my text book is "XML VISUAL QUICKSTART GUIDE". XML is a good old friend to me. I already know much about it. But I thought clarifying its basic notions would help me a lot at this timing.

That's all for prologue. Let's get started.

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計算機とその周辺: What I Talk About When I Talk About Computers

2011年4月30日土曜日

[XML VQG] 2. XSLT (6)

[XML VQG] 2. XSLT (5)

2011年4月24日日曜日

[XML VQG] 2. XSLT (4)

2011年4月23日土曜日

[XML VQG] 2. XSLT (3)

2011年4月12日火曜日

[XML VQG] 2. XSLT (2)

2011年4月9日土曜日

[XML VQG] 2. XSLT (1)

2011年4月6日水曜日

[XML VQG] 1. Writing XML

2011年4月5日火曜日

[XML VQG] (Introductory sections)

[XML VQG] Learning again?

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