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Xiaobian to share with you what the role of XML, I believe most people do not know how, so share this article for everyone's reference, I hope you read this article after a lot of gains, let's go to understand it!

overview

XML: Extensible Markup Language (XML) is an acronym used to define other languages, its predecessor is SGML(Standard Generalized Markup Language). It has no tag set and no grammatical rules, but it does have syntax rules. Any XML document must be well-formed for any type of application and correct parsing, i.e., every open tag must have a matching closing tag, must not contain tags out of order, and should conform to technical specifications in sentence formation. XML documents can be valid, but they do not have to be valid. A valid document is one that conforms to its Document Type Definition (DTD). A document is "schema valid" if it conforms to the specifications of a schema.

XML is a markup language, much like HTML ,XML is designed to transmit data, not display it,XML tags are not predefined. You need to define your own label. XML is designed to be self-descriptive. XML is a W3C Recommendation

XML is used to create new Internet languages

Many of the new Internet languages were created using XML:

Examples include:

XHTML -latest HTML version,WSDL -for describing available web services,WAP and WML -markup language for handheld devices,RSS -language for RSS feeds,

RDF and OWL -used to describe resources and ontologies,SMIL -used to describe multimedia for the web

Here's a common example:

Everyday Italian Giada De Laurentiis 2005 30.00 Harry Potter J K. Rowling 2005 29.99 Learning XML Erik T. Ray 2003 39.95

This can be explained as follows:

entity reference

In XML, some characters have special meanings.

If you take the character "

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