What is
?
XML, Extensible Markup Language
, extensible markup language. The suffix of the file is: .xml. Just like HTML is for displaying data, XML is for transmitting and storing data.
It is said that java is a professional language for operating XML.
What is it used for?
In order to facilitate data sharing and communication between different applications and different platforms.
The specific functions are:
(1) It can be used as a simple database to store and retrieve data;
( 2) Transmit files in the agreed format;
(3) Make software configuration files. [Configuration file: a file that saves software settings]
XML’s older brother——HTML
XML was born to improve the flaws and limitations of HTML.
The differences in usage are as follows:
XML’s best friend——JSON
JSON, Javascript Object Notation
, js object notation. The function is also to store and exchange text information.
Comparison of the two: JSON is smaller, faster, easier to parse, so, and more popular than XML.
The scope of both: JSON is suitable for simple value transfer, and XML is suitable for a wider range.
XML data structure - tree structure
How it is implemented specifically, readers can refer to the code in the example below to understand at a glance.
It is worth noting that just like a book has only one root, XML can only have one root element.
Mind Map
##ExampleCode in the
.xml file:
<?xml version="1.0" encoding="UTF-8"?> <email xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="email.xsd"> <to>liuwei8809@163.com</to> <form>hellokitty@163.com</form> <title>about loving</title> <body>I love you forever!</body> <date>2008-11-12</date> </email>
Code in the .xsd file:
<?xml version="1.0" encoding="UTF-8"?> <schema xmlns:xs="http://www.w3.org/2001/XMLSchema"> <xs:element name="email"> <xs:complexType> <xs:sequence> <xs:element name="to" type="xs:string"></xs:element> <xs:element name="from" type="xs:string"></xs:element> <xs:element name="title" type="xs:string"></xs:element> <xs:element name="body" type="xs:string"></xs:element> <xs:element name="date" type="xs:date"></xs:element> </xs:sequence> </xs:complexType> </xs:element> </schema>
Achieved effect:
For more related questions, please visit the PHP Chinese website: XML Video Tutorial
The above is the detailed content of Do you know XML? What is it used for?. For more information, please follow other related articles on the PHP Chinese website!

RSS documents work by publishing content updates through XML files, and users subscribe and receive notifications through RSS readers. 1. Content publisher creates and updates RSS documents. 2. The RSS reader regularly accesses and parses XML files. 3. Users browse and read updated content. Example of usage: Subscribe to TechCrunch's RSS feed, just copy the link to the RSS reader.

The steps to build an RSSfeed using XML are as follows: 1. Create the root element and set the version; 2. Add the channel element and its basic information; 3. Add the entry element, including the title, link and description; 4. Convert the XML structure to a string and output it. With these steps, you can create a valid RSSfeed from scratch and enhance its functionality by adding additional elements such as release date and author information.

The steps to create an RSS document are as follows: 1. Write in XML format, with the root element, including the elements. 2. Add, etc. elements to describe channel information. 3. Add elements, each representing a content entry, including,,,,,,,,,,,. 4. Optionally add and elements to enrich the content. 5. Ensure the XML format is correct, use online tools to verify, optimize performance and keep content updated.

The core role of XML in RSS is to provide a standardized and flexible data format. 1. The structure and markup language characteristics of XML make it suitable for data exchange and storage. 2. RSS uses XML to create a standardized format to facilitate content sharing. 3. The application of XML in RSS includes elements that define feed content, such as title and release date. 4. Advantages include standardization and scalability, and challenges include document verbose and strict syntax requirements. 5. Best practices include validating XML validity, keeping it simple, using CDATA, and regularly updating.

RSSfeedsareXMLdocumentsusedforcontentaggregationanddistribution.Totransformthemintoreadablecontent:1)ParsetheXMLusinglibrarieslikefeedparserinPython.2)HandledifferentRSSversionsandpotentialparsingerrors.3)Transformthedataintouser-friendlyformatsliket

JSONFeed is a JSON-based RSS alternative that has its advantages simplicity and ease of use. 1) JSONFeed uses JSON format, which is easy to generate and parse. 2) It supports dynamic generation and is suitable for modern web development. 3) Using JSONFeed can improve content management efficiency and user experience.

How to build, validate and publish RSSfeeds? 1. Build: Use Python scripts to generate RSSfeed, including title, link, description and release date. 2. Verification: Use FeedValidator.org or Python script to check whether RSSfeed complies with RSS2.0 standards. 3. Publish: Upload RSS files to the server, or use Flask to generate and publish RSSfeed dynamically. Through these steps, you can effectively manage and share content.

Methods to ensure the security of XML/RSSfeeds include: 1. Data verification, 2. Encrypted transmission, 3. Access control, 4. Logs and monitoring. These measures protect the integrity and confidentiality of data through network security protocols, data encryption algorithms and access control mechanisms.


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