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CHAPTER 3 WEB VOCABULARIES
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This document is saved as marsxhtm1-1.htm with your resources. As you can see, the XHTML 1.0 strict and XHTML 1.1 documents are almost identical. The major difference is the DOCTYPE declaration that specifies which DTD to use. Although most of the internal reorganization is invisible to you, web browsers can understand the modular structure much more easily. Viewing the document gives almost the same results as shown in Figure 3-1. You could modify the display by changing the stylesheet declarations, exactly as you did with the strict document. The next requirement for XHTML documents is that tags are written in lowercase.
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Unlike HTML, XHTML is a case-sensitive vocabulary. This means that you must write all elements and attributes in lowercase in order to make them valid. Of course, the text within the element and attribute values is not case-sensitive. In HTML, you had to write element names in uppercase. However, this wasn t enforced, so any of the following was allowable: <HTML> <Html> <html> In XHTML, however, the only allowable element construction is <html> Likewise, you must specify attributes using lowercase names. In HTML, any of the following were allowable: <IMG SRC="images/flower.gif"> <img src="images/flower.gif"> <Img Src="images/flower.gif"> In XHTML, all element and attribute names must be lowercase: <img src="images/flower.gif"> XHTML is case-sensitive because it s a requirement in XML. Case sensitivity is a major step in internationalization efforts. Although you can easily convert uppercase English characters to lowercase ones, or lowercase characters to uppercase, it s not so easy in other languages. Often there are no equivalent uppercase or lowercase characters, and some case mapping depends on region. Case sensitivity is important in order to allow the specification to use other languages and character sets.
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In HTML, you didn t need to close some elements, including <img>, <br>, <hr>, and <input>. These elements didn t mark up text, so they didn t have a corresponding closing element. In XML, this type of element, referred to as an empty element, may contain attributes but doesn t mark up text. You must close all elements for an XHTML document to be well formed.
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CHAPTER 3 WEB VOCABULARIES
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In HTML, empty elements appeared like this: <IMG SRC="flower.gif"> In XHTML, empty elements can either appear with an immediate opening and closing tag, such as <img src="flower-.gif"></img> or in the short form, such as <img src="flower.gif"/> In the short form, you add a forward slash (/) before the closing angle bracket (>). This tells the XML or XHTML parser that the element is empty. Although both forms are legal XHTML, very old browsers have problems reading opening and closing tags for elements that are empty. It s much better to use the short form for empty elements. These browsers also may have difficulty with the forward slash character, so, if you re targeting them, it s also good practice to add a space before the character (<br />).
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Attributes
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In addition to using the proper case for attribute names, you also need to make sure that you write them correctly. In HTML, you could write attribute values without quotation marks. For example, the following was legal in HTML: <TD colspan=4> HTML also allowed you to minimize attributes: <OPTION selected>An option</OPTION> Neither of these options is acceptable in XHTML. All attributes must have a value, even if it s blank, and you must enclose all values in matching quotation marks: <td colspan="4"> <option selected='selected'>An option</option> In the preceding <td> element, you add quotation marks around the attribute value 4. In the <option> element, you remove the minimization of the selected attribute and use single quotes around the attribute value. The value for the selected attribute is selected.
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