- Emiley J.
The first line is the XML declaration; it specifies the XML version and the XML file encoding. Notice that the line starts with . This combination of characters can cause a problem if you use this file as a PHP script. If you have the PHP setting short open tags enabled (the default), PHP sees the tag as the opening tag of a PHP section. If you work with XML in combination with PHP, change the short_open_tag setting in the php.ini file to Off.
XHTML is a W3C Recommendation that represents the future of HTML. Based on HTML 4.0, XHTML is designed to be compatible with existing web browsers while complying fully with XML. This means that a properly written XHTML document is always a well-formed XML document. Furthermore, XHTML documents must adhere to one or more of the XHTML DTDs, therefore XHTML pages can be validated using today's XML parsers such as Apache's Crimson.
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