XML syntax [focus]

I. Introduction & Overview

Why talk about XML: In order to use the program more professional profile

XML called the Extensible Markup Language, which means Extensible Markup Language.

Java programming language: the first compiler implementation

XML markup language: the language of the label consisting of

effect:

save data

Save the program configuration information (which applets to run, run after which the applet)

Getting two cases: quickly create XML file

XML in the src helpful information

XML project under the root directory of the lack of help

III. Documentation statement

All first line of the XML document is a document declaration:

Documentation must be declared in the first line of the document;

IV. Elements (tags)

XML is a markup language: composed by a label

Label format:

E.g:

Elements of the case, must be paired general (must start with end)
Between the start and end tags: ① ② sub-content body text label (sub-element)

3. Empty elements: empty element tag is only the beginning, but no end tag, but the elements must own closed

Empty elements: no body text content, there is no sub-elements

note:

Naming elements:

a) strictly case-sensitive (IDEA automatically synchronized)

b) no spaces

Schema will be used later to explain the constraints: C) is not recommended at present use a colon

d) it is not recommended to start with XML, xml, Xml

e) does not recommend the use of Chinese

2. Format good XML document must have only one root element.

The root element: the root tag, wrap all the other label content in XML

A document must have only one root tag.

V. attribute (Java member variables)

Attribute format:

<1 start tag attribute name = "attribute value 1" 2 attribute name = "attribute value 2"> </ tag end>

Precautions:

The same tag, the property can not be duplicate names

2. The property name can not use spaces, colon and other special characters, and must start with a letter

3, pay attention to Chinese em space when defining attribute

<?xml version="1.0" encoding="UTF-8" ?>
<plist>
    <person name="小田田" sex="男" age="28"></person> <person name="小关关" sex="男" age="23"></person> <person name="小润润" sex="男" age="23"/> </plist>

VI. Notes

Note: to the programmer, the description information

XML comments:

Format: <-! XML comment ->

Comment out the first line on XML

Join / Uncomment shortcuts: ctrl + /

VII. Escape character

In XML, some characters are XML syntax as a structure to use.

<?xml version="1.0" encoding="UTF-8" ?>
<beans>
    1&lt;2
    2&gt;1
    &quot;
    &apos;
    &amp;
</beans>

Eight. CDATA area

Help me avoid checking XML, CDATA area can put plain text.

<?xml version="1.0" encoding="UTF-8" ?>
<exam>
    <question> 1、问题1：以下哪个符号是大于号？ A.&gt; B.&lt; C.! D.!= </question> <question> <![CDATA[ 1、问题1：以下哪个符号是大于号？ A.> B.< C.! D.!= ]]> </question> </exam>

Shortcuts: CD

Read data from XML with Java programs

Write data to the XML in the Java programming

CDATA data operation is troublesome area

Please give their efforts a point like oh!

A little progress every day ~~~~~ `

Source: http://www.1994july.club/

java object-oriented programming 3 (5) XML syntax [focus]