XML file explanation: what is XML, XML configuration file, XML data file, XML file parsing tutorial

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1、 Introduction Overview XML, Why use XML（ remember ）

1. XML Designed to transmit and store data .
2. XML The data from HTML Separate
3. XML Simplify data sharing
4. XML Simplify data transfer
5. XML Simplify data transfer
6. XML Make your data more useful

  summary ：XML Is the file used to store data , We can extract the data we want after parsing .

1、 Such as ： The data to be configured is stored in the configuration file ;2、 Data files store the data we need to use ;

 

2、 Write XML The syntax of the file needs attention , Remember, there will be no problem

1. XML The document must have a root element

2. XML Optional parts of the declaration file ,<?xml version="1.0" encoding="utf-8"?>

3. be-all XML Element must have a close tag

4. XML Tags are case sensitive

5. XML Must nest... Correctly

6. XML Attribute values must be quoted

7. XML The comments in ,<!-- This is a comment -->

8. stay XML in , Spaces will be reserved

3、 Start writing your own XML Data files 、XML The configuration file

~ Data file instance ：

 Define a bookstore Data files , Store the data you need 
<bookstore>
    <book category="COOKING">
        <title lang="en">Everyday Italian</title>
        <author>Giada De Laurentiis</author>
        <year>2005</year>
        <price>30.00</price>
    </book>
    <book category="CHILDREN">
        <title lang="en">Harry Potter</title>
        <author>J K. Rowling</author>
        <year>2005</year>
        <price>29.99</price>
    </book>
    <book category="WEB">
        <title lang="en">Learning XML</title>
        <author>Erik T. Ray</author>
        <year>2003</year>
        <price>39.95</price>
    </book>
</bookstore>

~ Example project configuration file

<?xml version="1.0" encoding="utf-8" ?>
<-- Project name apache_client , The variables that need to be configured for the project are service_connects、status_change 、data_upload>
<apache_client   
	service_connects="times" 
	status_change="time1" 
	data_upload="time2">
<-- The data volume of the project server can be configured 、 The data of the server is name、host\port>
  <ftp_server_list>
	<ftp_server name="01" host="1.1.1.1" port="21" />
	<ftp_server name="02" host="ftp.advantech.com" port="21" />
	<ftp_server name="03" host="" port="" />
  </ftp_server_list>
  
</apache_client>

I believe I read the above XML The file is introduced , Yes XML The document has a deeper understanding , Later we will explain XML Analytical way ,

If you have any questions, you can enter the group for consultation , Communication and learning , Bao Jiaobao understands .

 

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