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- name clashes.

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>
      <title>Description of gadget</title>
      A gadget contains a big gizmo

Meaning of head and big depends on context!

This complicates things for processors and might even cause ambiguities.

The problem is: one common name-space.