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You can place anything in a conditional section that you would normally place in a DTD If the keyword is INCLUDE, the text in the conditional section is included in the DTD If the keyword is IGNORE, the text is ignored Here's an example of a conditional section: the included sections are parsed, and the ignored sections are not: <![IGNORE[

<![INCLUDE[

<!ELEMENT researchPaper (comments*,

<![INCLUDE[

Using conditional sections, you can tailor a DTD the way you want it to match different versions of your document, switching between versions easily by simply having the parser include or ignore sections as you like You can use entities, but only parameter entities, in a conditional section, like the following (Note that we declare the entities with a % symbol to make them parameter entities) <!ENTITY % proposed 'IGNORE' >

<![%proposed;[

<![%reviewed;[

<!ELEMENT researchPaper (comments*,

<![%reviewed;[

Summary

That's it for conditional sections, and that's it for this chapter In this chapter, we've examined the DTD in depth, seeing how to declare elements, attributes and attribute lists, entities, notations, and conditional sections We've finished our coverage of Part I of the XML specification In the next chapter, we'll continue our exploration of XML when we build XML browsers

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1 An XML document must contain all elements declared in the DTD a True b False 2 #PCDATA refers to a Parsed charter data b Program character data c Parsed character data d None of the above 3 A question mark following the name of a child name in the declaration of a parent element means a The child element is required b The child element is optional c The name of the child element is unknown d One occurrence of the child element is required

In this chapter, we'll see how to create XML browsers, which we'll use to read and interpret XML tags in XML documents XML is a free-form language, which means that we design it ourselves, so you can't expect a pre-written browser to know how we want to handle the markup correctly For example, let's say we had a document whose text could appear colored either red or blue, and that we set up a <RED> tag and a <BLUE> tag to indicate the text colorings we wanted in this XML document: < XML VERSION = "10" >

<!DOCTYPE COLORDOCUMENT [

If you opened this document in a commercial HTML browser, that browser would have no idea what to do with the <RED> and <BLUE> tags (and would probably display them as text) We'll have to interpret tags like <RED> and <BLUE> ourselves, making use of them in Java applications and coloring the text ourselves And that's what our XML browsers will be[md]Java applications that use the MSXML parser to read in and parse XML documents, making use of the tags in that document as we have designed them to In this chapter, then, we'll see how to create XML browser applications This will involve some detailed work in dissecting XML document trees using recursion[md]process we've had a little experience with in the last chapter We'll create a number of examples in this chapter[md]a tree example that will display the tree structure of an XML document; an example named browser that displays the character data of an XML document; an example named indenter that lets you use two tags: <INDENT> and <INDENTDOUBLE> to format text, and an example named caps that lets you display text in lower or upper case with the tags <LOWER> and <UPPER> Let's start now with the tree example

Our first XML browser will display the tree structure of an XML document For example, we might pass this XML document to the tree application: < XML version = "10" >

<!DOCTYPE DOCUMENT [

The tree application will take the above document and display the element tree of that document like

this, displaying the start tag and end tag structure of the document and indenting it properly: <DOCUMENT>

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