XML

Overview

Extensible Markup Language (XML) is a markup language and file format for storing, transmitting, and reconstructing arbitrary data.

An XML document is divided into markup and content. A tag is a markup construct beginning with < and ending with >. An element is a logical document component spanning a start and end tag or consisting of just an empty-element tag.

Namespaces

Namespaces are declared using the reserved xmlns attribute. A declaration is formatted as follows: xmlns[:<prefix>]="<namespace name>". If no prefix is specified, the attribute defines the default namespace.