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Extensible Markup Language
Markup Components
Document Declaration
Comment
Namespace
xml lang
xml base
XLink
XPointer
XInclude
XPath
Data Types
Path Expressions
Sequence Flow Control and Typing
Node Functions
Numeric Functions
Math Functions
String Functions
URI Functions
Datetime Functions
Sequence Functions
File Functions
String Parsing Functions
Higher order Functions
Error Functions
Custom Functions
Schema Languages
DTD
XSD
Relax NG
Relax NG Compact
Schematron
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xml lang
This special attribute declares the formal language for the content of the tag. It can be overridden.