THE XML REVOLUTION - TECHNOLOGIES FOR THE FUTURE WEB

Mixing XML languages

Consider an XML language WidgetML which uses XHTML as a sublanguage for help messages:

<widget type="gadget"> <head size="medium"/> <big><subwidget ref="gizmo"/></big> <info> <head> <title>Description of gadget</title> </head> <body> <h1>Gadget</h1> A gadget contains a big gizmo </body> </info> </widget>

`<widget type="gadget"> <head size="medium"/> <big><subwidget ref="gizmo"/></big> <info> <head> <title>Description of gadget</title> </head> <body> <h1>Gadget</h1> A gadget contains a big gizmo </body> </info> </widget>`

A problem: the meaning of head and big depends on the context!

This complicates things for processors and might even cause ambiguities.

The root of the problem is: one common name space.