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The html Output Method
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Under the html output method, elements are serialized according to HTML rules the XSLT processor recognizes certain elements and attributes as being serialized without end tags, for example, and generates output accordingly. For example, taking the same result tree as we used for the xml output method, the html output method creates a section in a document that looks something like this: <p> This paragraph contains a line break,<br> & characters that must be escaped in XML and HTML, & a boolean attribute in the following: <input name="answer" value="OK" type="checkbox" checked> </p> Both the <br> and the <input> element nodes are serialized without end tags and without the special empty element syntax that s used by XML. The ampersand character is escaped with a character entity reference, as with XML, but the Boolean attribute (checked) isn t given a name. The html output method does various other special things during output: It usually adds a <meta> element to the <head> element, specifying the content type of the document, unless you tell it not to by setting the include-content-type attribute on the output definition to no. It usually ensures that URLs, in the href attribute of <a> elements, for example, are escaped correctly, unless you tell it not to by setting the escape-uri-attributes attribute on the output definition to no. It doesn t escape the special XML characters (for example, less-than signs or ampersands) when they appear within <script> or <style> elements. It uses character entity references, such as  , to output those non-ASCII characters for which names are defined in HTML. All these steps ensure that the output that you generate using the html output method adheres to the syntax rules of HTML.
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The xhtml Output Method
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The xhtml output method is very similar to the xml output method, except that the result is serialized in such a way that normal HTML browsers should display the result as they would the equivalent HTML. Taking the result document snippet in Figure 8-15, the xhtml output method creates something like the following:
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CHAPTER 8 RESULT TREES
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<p> This paragraph contains a line break,<br /> & characters that must be escaped in XML and HTML, & a boolean attribute in the following: <input name="answer" value="OK" type="checkbox" checked="checked" /> </p> As you can see, this is almost exactly the same as the result from the xml output method; the only difference is that in the empty element tags for the <br> and <input> elements, there s a space before the final "/>". This helps to make sure that HTML browsers display the XHTML correctly. Like the html output method, the xhtml output method does various other extra things to the output: It usually adds a <meta> element to the <head> element, specifying the content type of the document, unless you tell it not to by setting the include-content-type attribute on the output definition to no. It usually ensures that URLs, in the href attribute of <a> elements, for example, are escaped correctly, unless you tell it not to by setting the escape-uri-attributes attribute on the output definition to no. The XHTML namespace is declared as the default namespace, rather than with a prefix. If an element isn t defined as an empty element in XHTML, it s always serialized with a start and end tag. These tweaks help make sure that, while the result document is serialized as legal XML, it s also possible to view it in an HTML browser, as HTML.
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The text Output Method
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You can use the xml, html, or xhtml output methods to generate a document that holds only text if the result tree that you generate doesn t contain anything other than text nodes. However, as we ve seen, if you use these methods the values of the text nodes are escaped less-than signs become < and ampersands become &. The text method is therefore essential when you re generating plain text, such as comma-separated files, Java code, or SQL queries, as it prevents the five special XML characters from being escaped with their built-in entity references during serialization. When you output a result tree using the text method, all nodes aside from text nodes are completely ignored. If we take the tree shown in Figure 8-15 as before, the text output method would create the following lines of text: This paragraph contains a line break, & characters that must be escaped in XML and HTML, & a boolean attribute in the following: As you can see, the elements are ignored, and the ampersand isn t escaped at all.
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