The <?xml ...?> Processing Instruction

This section describes the 'xml' processing instruction, which is required at the top of XML files. 'xml' processing instruction must have the 'version' attribute.

Every XML file must contain one "xml" processing instruction at the beginning of the file to declare that this file is an XML file.

There is one required attribute for the "xml" processing instruction: version="n", indicating the version number of the XML standard.

Valid attributes of the "xml" processing instruction are:

Here is an example XML file that has all 3 attributes included in the "xml" processing instruction:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<p>Hello world!</p>

In this tutorial book, we are learning XML version 1.0.

Table of Contents

 About This Book

 Introduction of XML (eXtensible Markup Language)

XML File Syntax

 Types of Information in XML Files

 XML File Syntax Rules

The <?xml ...?> Processing Instruction

 dictionary.xml - A Simple XML Sample File

 XML File Browsers

 DOM (Document Object Model) Programming Interface

 SAX (Simple API for XML) Programming Interface

 DTD (Document Type Definition) Introduction

 Syntaxes of DTD Statements

 Validating an XML Document against the Specified DTD Document Type

 XSD (XML Schema Definition) Introduction

 Syntaxes of XSD Statements

 Validating XML Documents Against Specified XML Schemas

 XSL (Extensible Stylesheet Language) Introduction

 XSLT (XSL Transformations) Introduction

 Java Implementation of XSLT

 XPath (XML Path) Language

 XSLT Elements as Programming Statements

 Control and Generate XML Element in the Result

 XML Notepad - XML Editor

 XML Tools Plugin for Notepad++

 XML 1.1 Changes and Parsing Examples

 Outdated Tutorials

 References

 PDF Printing Version