Backend DevelopmentXML/RSS TutorialXML development basics-detailed code explanation of XML attributes
XML elements can contain the attribute in the opening tag, similar to HTML.
Attributes provide additional information about the element.
XML Attributes
From HTML, you will recall this: 
. The "src" attribute provides additional information about the element.
In HTML (and in XML), attributes provide additional information about an element:
<img src="/static/imghwm/default1.png" data-src="computer.gif" class="lazy" alt="XML development basics-detailed code explanation of XML attributes" > <a href="demo.asp">
Attributes often provide information that is not part of the data. In the following example, the file type is irrelevant to the data, but is important to the software that needs to process this element:
<file type="gif">computer.gif</file>
XML attributes must be quoted
Attribute values must be surrounded by quotes , but both single and double quotes can be used. For example, for a person's gender, the person tag can be written like this:
<person sex="female">
or this way:
<person sex='female'>
Note: If the attribute value itself contains double quotes, it is necessary Surround it with single quotes, like this example:
<gangster name='George "Shotgun" Ziegler'>
Or you can use entity to quote :
<gangster name="George "Shotgun" Ziegler">
XML Elements vs. Attributes
See These examples:
<person sex="female">Anna Smith female Anna Smith
In the first example, sex is an attribute. In the second example, sex is a child element. Both examples provide the same information.
There are no rules that tell us when to use attributes and when to use subelements. My experience is that in HTML, attributes are very convenient to use, but in XML, you should try to avoid using attributes. If the information feels a lot like data, use child elements.
My favorite way
The following three XML documents contain the exact same information:
The first example uses the date attribute :
<note date="08/08/2008"> <to>George</to> <from>John</from> <heading>Reminder</heading> <body>Don't forget the meeting this weekend!</body> </note>
The second example uses the date element:
<note> <date>08/08/2008</date> <to>George</to> <from>John</from> <heading>Reminder</heading> <body>Don't forget the meeting this weekend!</body> </note>
The third example uses the extended date element (this is my favorite):
<note> <date> <day>08</day> <month>08</month> <year>2008</year> </date> <to>George</to> <from>John</from> <heading>Reminder</heading> <body>Don't forget the meeting this weekend!</body> </note>
Avoid XML attributes?
Some problems caused by using attributes:
Attributes cannot contain multiple values (subelements can)
Attributes cannot describe the tree structure (subelements can)
Attributes are not easy to extend (for future changes)
Attributes are difficult to read and maintain
Please try to use elements to describe data. Instead, just use attributes to provide data-independent information.
Don't do something stupid like this (this is not the way XML should be used):
<note day="08" month="08" year="2008" to="George" from="John" heading="Reminder" body="Don't forget the meeting this weekend!"> </note>
XML attributes for metadata
Sometimes ID references are assigned to elements. These ID indexes can be used to identify XML elements in the same way as the ID attribute in HTML. This example demonstrates this to us:
<messages> <note id="501"> <to>George</to> <from>John</from> <heading>Reminder</heading> <body>Don't forget the meeting this weekend!</body> </note> <note id="502"> <to>John</to> <from>George</from> <heading>Re: Reminder</heading> <body>I will not</body> </note> </messages>
The ID above is just an identifier, used to identify different notes. It is not part of the note data.
The idea we are trying to convey to you here is that metadata (data about data) should be stored as attributes, and the data itself should be stored as elements.
The above is the detailed content of XML development basics-detailed code explanation of XML attributes. For more information, please follow other related articles on the PHP Chinese website!
Scaling XML/RSS Processing: Performance Optimization TechniquesApr 27, 2025 am 12:28 AMWhen processing XML and RSS data, you can optimize performance through the following steps: 1) Use efficient parsers such as lxml to improve parsing speed; 2) Use SAX parsers to reduce memory usage; 3) Use XPath expressions to improve data extraction efficiency; 4) implement multi-process parallel processing to improve processing speed.
RSS Document Formats: Exploring RSS 2.0 and BeyondApr 26, 2025 am 12:22 AMRSS2.0 is an open standard that allows content publishers to distribute content in a structured way. It contains rich metadata such as titles, links, descriptions, release dates, etc., allowing subscribers to quickly browse and access content. The advantages of RSS2.0 are its simplicity and scalability. For example, it allows custom elements, which means developers can add additional information based on their needs, such as authors, categories, etc.
Understanding RSS: An XML PerspectiveApr 25, 2025 am 12:14 AMRSS is an XML-based format used to publish frequently updated content. 1. RSSfeed organizes information through XML structure, including title, link, description, etc. 2. Creating RSSfeed requires writing in XML structure, adding metadata such as language and release date. 3. Advanced usage can include multimedia files and classified information. 4. Use XML verification tools during debugging to ensure that the required elements exist and are encoded correctly. 5. Optimizing RSSfeed can be achieved by paging, caching and keeping the structure simple. By understanding and applying this knowledge, content can be effectively managed and distributed.
RSS in XML: Decoding Tags, Attributes, and StructureApr 24, 2025 am 12:09 AMRSS is an XML-based format used to publish and subscribe to content. The XML structure of an RSS file includes a root element, an element, and multiple elements, each representing a content entry. Read and parse RSS files through XML parser, and users can subscribe and get the latest content.
XML's Advantages in RSS: A Technical Deep DiveApr 23, 2025 am 12:02 AMXML has the advantages of structured data, scalability, cross-platform compatibility and parsing verification in RSS. 1) Structured data ensures consistency and reliability of content; 2) Scalability allows the addition of custom tags to suit content needs; 3) Cross-platform compatibility makes it work seamlessly on different devices; 4) Analytical and verification tools ensure the quality and integrity of the feed.
RSS in XML: Unveiling the Core of Content SyndicationApr 22, 2025 am 12:08 AMThe implementation of RSS in XML is to organize content through a structured XML format. 1) RSS uses XML as the data exchange format, including elements such as channel information and project list. 2) When generating RSS files, content must be organized according to specifications and published to the server for subscription. 3) RSS files can be subscribed through a reader or plug-in to automatically update the content.
Beyond the Basics: Advanced RSS Document FeaturesApr 21, 2025 am 12:03 AMAdvanced features of RSS include content namespaces, extension modules, and conditional subscriptions. 1) Content namespace extends RSS functionality, 2) Extended modules such as DublinCore or iTunes to add metadata, 3) Conditional subscription filters entries based on specific conditions. These functions are implemented by adding XML elements and attributes to improve information acquisition efficiency.
The XML Backbone: How RSS Feeds are StructuredApr 20, 2025 am 12:02 AMRSSfeedsuseXMLtostructurecontentupdates.1)XMLprovidesahierarchicalstructurefordata.2)Theelementdefinesthefeed'sidentityandcontainselements.3)elementsrepresentindividualcontentpieces.4)RSSisextensible,allowingcustomelements.5)Bestpracticesincludeusing
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool
mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),
MinGW - Minimalist GNU for Windows
This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.
MantisBT
Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.
EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function
