Chapter 1 Introduction to XML Basics

The purpose of designing XML is not to replace html. XML is currently used to work with HTML to expand the functions of website pages.

HTML, SGML, and XML will coexist all the time.

Processing Command: <?...?>
For example, document Declaration: <? XML version = "1.0"?>
Note that XML is case sensitive, which is also required by advanced languages.

<! [CDATA [
]>
It indicates that the text is displayed according to the original text. The interpreter does not interpret the text and is mostly used in text containing <,> and other labels.
Note: CDATA can be placed where any character data can appear, that is, it is located in the element content rather than the XML tag.

When you use CSS to display XML data, the style of each XML element name defined in CSS directly corresponds to the display of this element.