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Simple vs. Extended links

- for compatibility and simplicity

Two kinds of links:

  • extended - the general ones we have seen so far
  • simple - a restricted version of extended links: only for two-ended outbound links (enough for HTML-style links)
Convenient shorthand notation for simple links: 

  <mylink xlink:type="simple" xlink:href="..." xlink:show="..." .../>

is equivalent to: 

  <mylink xlink:type="extended">
    <myresource xlink:type="resource" 
                xlink:role="local"/>
    <myresource xlink:type="locator" 
                xlink:role="remote" xlink:href="..."/>
    <myarc xlink:type="arc" 
           xlink:from="local" xlink:to="remote" xlink:show="..." .../>
  </mylink>

Many XLink properties (e.g. xlink:type and xlink:show) can conveniently be specified as defaults in the schema definition!

When should I use XLink? Tim Berners-Lee: only for hypertext linking (Not everybody agree...)

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