 What is NCNAME (used for laben, from and to) ?

ATTRIBUTES
==========
role		URI (absolute)
arcrole		URI (absolute)
title		STRING (human readable)

label		NCName
from 		NCName
to 		NCName

href		URI (any)

TYPED-ELEMENTS
==============
extended
simple
locator
resource
arc
title

IMPORTANT STUFF
===============
* locator-type elements address the remote resources participating in the link 
* arc-type elements provide traversal rules among the link's participating resources 
* title-type elements provide human-readable labels for the link 
* resource-type elements supply local resources that participate in the link

* a local resource is specified "by value," and a remote resource is specified "by reference."


Hierarchie
==========

extendet
  locator *
  resource *
  arc *

