[Jackrabbit Wiki] Update of "mix:referenceable" by KarianneBerg

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The following page has been changed by KarianneBerg:
http://wiki.apache.org/jackrabbit/mix%3areferenceable

The comment on the change is:
Added info on how to retrieve a node by it's UUID

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  The only standard way for an application to explicitly set the UUID of a created node is to use the XML import feature in JCR level 2.
  
+ By setting this mixin type, it also becomes possible to retrieve a node by it's UUID, regardless of which path it has. This is done by calling session.getNodeByUUID(<the UUID of the node as a String>)
+ 
  == Related node types ==
  
   * The ["mix:versionable"] mixin type extends ["mix:referenceable"]