JavaScript's Ajax-3 XML syntax (XML overview, basic syntax)

I. Overview of XML

XML overview

-XML is Extensible Markup Language (extensible Markup Language)

-XML is a markup language, similar to HTML

-XML is designed to transmit data, not real data

-XML tags are not predefined and need to be defined by themselves

-XML is a recommended standard for the consortium

XML use

-XML is applied to many aspects of web development and is often used to simplify the storage and sharing of data

-XML can separate data from HTML

-XML can simplify data sharing

-XML can simplify data transfer

Second, basic grammar

XML declaration

-The XML declaration must start with <?xml and end with?>

-the declaration must start at the 0-row 0-column position of the document

-declaration has only three attributes:

-Version: Specifies the XML document version. Must attribute, because we will not choose 1.1, will only choose 1.0

-Encoding: Specifies the encoding of the current document. Optional attribute, default value is Utf-8

-Standalone: Specifies document independence. The optional attribute, the default value of Yes, indicates that the current document is a stand-alone document. If no indicates that the current document is not a separate document, it depends on the external file

XML syntax

-XML is made up of tags, but all XML elements must have a close tag

-<p>this is a XML target</p>

-<p>this is a XML target (error)

-XML tags are case sensitive and must be written and closed using the same casing

-<Message></Message>

-<message></Message> (Error)

-XML must be nested correctly

-<b><i>this a XML target</i></b>

-<b><i>this a XML targetc</b></i>

-XML must have a root element

-an XML document must have an element that is the parent element of another element

-Attribute values for XML must be quoted

XML element

-XML Element concept

-The XML element refers to the part from (and including) the start tag until (and includes) the end tag

-elements can contain other elements, text, and so on. Element can have properties

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XML Properties

-XML Properties Overview

-XML elements can include attributes in the start tag, like HTML

-Property provides additional (additional) information about the element, or is used to modify the element

-attribute values must be enclosed in quotation marks, both single and double quotes can be used

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Summary: This chapter focuses on XML syntax (XML overview, basic syntax)

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JavaScript's Ajax-3 XML syntax (XML overview, basic syntax)