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Markup Languages
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When you think of the Web, you think of HTML, the Hypertext Markup Language. Like a natural language, there are two parts to a markup language: its vocabulary and its grammar. The vocabulary tells you the names of the components that you can use in a document. Those things are Elements like <P> and <A> Attributes like class and href Entities like   and é
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CHAPTER 1 INTRODUCING XML
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The grammar tells you the rules that tie the parts of the vocabulary together. These are rules like the following: An <A> element has an href attribute A <UL> element can contain one or more <LI> elements The <HEAD> element must contain a <TITLE> element Now, you could imagine a different markup language that uses a different vocabulary and grammar. Instead of a <P> element, it might use the name <para>; rather than having <H1> to <H6> for headings, it might use <section> elements with <title> elements inside them, and so on.
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Extending HTML
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Why would you need this other language Well, have a look at the HTML that we re using for our TV guide in Listing 1-1. Listing 1-1. TVGuide.html <HTML> <HEAD> <TITLE>TV Guide</TITLE> <LINK rel="stylesheet" href="TVGuide.css"> <SCRIPT type="text/javascript"> function toggle(element) { if (element.style.display == 'none') { element.style.display = 'block'; } else { element.style.display = 'none'; } } </SCRIPT> </HEAD> <BODY> <H1>TV Guide</H1> <H2><SPAN class="day">Thursday</SPAN> 5 July</H2> <TABLE width="100%"> <TR> <TH width="16%">Channel <TH colspan="6" width="12%">7:00 <TH colspan="6" width="12%">7:30 ... <TR> <TH class="channel">BBC1 <TD colspan="6" class="quiz"> <SPAN class="title">A Question Of Sport</SPAN><BR> <TD colspan="6" class="soap"> <IMG src="flag.gif" alt="[Flagged]" width="20" height="20">
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Mark's health scare forces him to reconsider his future with Lisa, while Jamie is torn between Sonia and Zoe. <SPAN onclick="toggle(EastEndersCast);">[Cast]</SPAN> <DIV id="EastEndersCast" style="display: none;"> <UL class="castlist"> <LI> <SPAN class="character">Zoe Slater</SPAN> <SPAN class="actor">Michelle Ryan</SPAN> <LI> <SPAN class="character">Jamie Mitchell</SPAN> <SPAN class="actor">Jack Ryder</SPAN> <LI> <SPAN class="character">Sonia Jackson</SPAN> <SPAN class="actor">Natalie Cassidy</SPAN> </UL> </DIV> ... </TABLE> </BODY> </HTML> HTML has elements that allow us to say that a particular word or phrase is a link or should be emphasized, but it doesn t let us state that this part of the TV description is the title of the program, that bit its running length, this other section lists its cast, and so on. Identifying those parts is important for two reasons: It affects the way that information looks on the page. The presentation of a piece of content is often tied to its meaning. If we had elements to indicate the meaning of these words and phrases, we would be able to display them in different ways with CSS. It helps other people, and more importantly applications, look at the page and draw some conclusions about the information that it contains. If we used <B> to indicate the program s title and the name of a character, then all an application could tell was that those phrases should be in bold. If we had more descriptive element names, like <title> and <character>, then the application could distinguish between the two and could actually make use of that information.
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Changing CSS Classes to Elements
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We re currently using the class attributes on HTML elements and using <SPAN> and <DIV> elements in our HTML page to indicate the meaning of the parts of the page. This is fine as far as it goes, but it doesn t give us the flexibility and control that an element and attributes would. For example, currently the TVGuide.html HTML page contains the following structure for cast lists: <UL class="castlist"> <LI> <SPAN class="character">Zoe Slater</SPAN> <SPAN class="actor">Michelle Ryan</SPAN>
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CHAPTER 1 INTRODUCING XML
<LI> <SPAN <SPAN <LI> <SPAN <SPAN </UL>
class="character">Jamie Mitchell</SPAN> class="actor">Jack Ryder</SPAN> class="character">Sonia Jackson</SPAN> class="actor">Natalie Cassidy</SPAN>
In this structure the cast list contains a number of character-actor pairs, but there s nothing in the grammar of HTML that determines this it s just a rule that we know about. We assume that this rule holds true in the CSS that we use to present the cast list. Instead, we could design a markup language that uses elements to mark up the cast list as shown in Listing 1-2. Listing 1-2. castlist1.xml <castlist> <member> <character>Zoe Slater</character> <actor>Michelle Ryan</actor> </member> <member> <character>Jamie Mitchell</character> <actor>Jack Ryder</actor> </member> <member> <character>Sonia Jackson</character> <actor>Natalie Cassidy</actor> </member> </castlist> Using elements means that it s easy to write the grammar for the cast list: <castlist> elements contain one or more <member> elements. <member> elements contain a <character> element followed by an <actor> element. <character> and <actor> elements contain text. It also means that we can add attributes to these elements if we want to, perhaps indicating the gender of the different characters as we do in Listing 1-3. Listing 1-3. castlist2.xml <castlist> <member> <character gender="female">Zoe Slater</character> <actor>Michelle Ryan</actor> </member>
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