Student Name's Web Page </head> <body style="li {margin:5pt}"> <H1>Page with XML Errors in It</H1> <p>This page is designed to show some of the problems that can arise and the associated error messages that <a href="http://validator.w3.org/"> the validator</a> throws up. Note that the page renders well in most browsers even though it is invalid in so many ways. <p>The error messages and their meaning will be listed below.</p> <img src = "w3c.png" height = 60> <p>Can you see the three errors on the previous line?</p> <hr> <h3>The Program</h3> <pre> 1 <?xml version="1.0" encoding="UTF-8"?><br /> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><br /> 2 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"><br /> 3 <head><br /> 4 <title>Student Name's Web Page<br /> 5 </head><br /> 6 <body style="li {margin:5pt}"><br /> 7 <H1>Page with XML Errors in It</H1><br /> 8 <p>This page is designed to show some of the problems that can arise and the associated error messages that<br /> 9 <a href="http://validator.w3.org/"> the validator</a> throws up. Note that the page renders well in most <br /> 10 browsers even though it is invalid in so many ways.<br /> 11 <p>The error messages and their meaning will be listed below.</p><br /> 12 <img src = "w3c.png" height = 60><br /> 13 <p>Can you see the three errors on the previous line?</p><br /> 14 <hr><br /> 15 </body><br /> 16 </html> </pre> <hr> <h3>The Errors</h3> <ol> <li style="border:5pt"><strong>End tag omitted for <title></strong> <ul> <li><strong>Message</strong></li> <li><em>Line 6, Column 6</em>: end tag for "title" omitted, but OMITTAG NO was specified.</li> <li><strong>Explanation</strong></li> <li>You may have neglected to close an element, or perhaps you meant to "self-close" an element, that is, ending it with "/>" instead of ">".</li> <li><strong>Real Location</strong></li> <li><em>Line 5, Column 0</em>: start tag was here.</li> </ul> </li> <li style="margin:5pt"><strong>Not using upper case tags</strong> <ul> <li><strong>Message</strong></li> <li><em>Line 8, Column 3</em>: element "H1" undefined.</li> <li><strong>Explanation</strong></li> <li><p> You have used the element named above in your document, but the document type you are using does not define an element of that name. This error is often caused by: </p> <ul> <li>incorrect use of the "Strict" document type with a document that uses frames (e.g. you must use the "Frameset" document type to get the "<frameset>" element),</li> <li>by using vendor proprietary extensions such as "<spacer>" or "<marquee>" (this is usually fixed by using CSS to achieve the desired effect instead).</li> <li>by using upper-case tags in XHTML (in XHTML attributes and elements must be all lower-case).</li> </ul></li> </ul> </li> <li style="margin:5pt"><strong>Omitting closing paragraph tag - "</p>" </strong> <ul> <li><strong>Message</strong></li> <li><em>Line 12, Column 2</em>: document type does not allow element "p" here; missing one of "object", "ins", "del", "map", "button" start-tag</li> <li><strong>Explanation</strong></li> <li><p> The mentioned element is not allowed to appear in the context in which you've placed it; the other mentioned elements are the only ones that are both allowed there <em>and</em> can contain the element mentioned. This might mean that you need a containing element, or <strong>possibly that you've forgotten to close a previous element.</strong> </p> <p> One possible cause for this message is that you have attempted to put a block-level element (such as "<p>" or "<table>") inside an inline element (such as "<a>", "<span>", or "<font>"). </p></li> </ul> </li> <li style="margin:5pt"><strong>Leaving out the quotes around attributes</strong> <ul> <li><strong>Message</strong></li> <li><em>Line 13, Column 30</em>: an attribute value specification must be an attribute value literal unless SHORTTAG YES is specified</li> <li><strong>Explanation</strong></li> <li>An <em>attribute value literal</em> is a value for the attribute that must be in quotes.</li> </ul> </li> <li style="margin:5pt"><strong>Leaving out required attributes</strong> <ul> <li><strong>Message</strong></li> <li><em>Line 13, Column 32</em>: required attribute "alt" not specified</li> <li><strong>Explanation</strong></li> <li>The attribute given above is required for an element that you've used, but you have omitted it. </li> </ul> </li> <li style="margin:5pt"><strong>Not closing empty elements</strong> <ul> <li><strong>Message</strong></li> <li><em>Line 13, Column 33</em>: end tag for "img" omitted, but OMITTAG NO was specified.</li> <li><strong>Explanation</strong></li> <li>You may have neglected to close an element, or perhaps you meant to "self-close" an element, that is, ending it with "/>" instead of ">".</li> </ul> </li> <li style="margin:5pt"><strong>Not closing empty elements</strong> <ul> <li><strong>Message</strong></li> <li><em>Line 17, Column 7</em>: XML Parsing Error: Premature end of data in tag head line 4.</li> <li><strong>Explanation</strong></li> <li>This is a re-iteration of error 1 - it has reached the end of the file and never found a an end tag for title. This will disappear if you add the end tag.</li> </ul> </li> </ol> </body> </html>