anchor.diff:  
   image::annotation_pos.jpg[align="center"]
   
  -link:http://en.wikipedia.org/wiki/Coreference[Co-reference] annotation can be made over several tokens within one sentence. A single token sequence have several co-ref spans simultaneously.
  +link:http://en.wikipedia.org/wiki/Coreference[Co-reference] annotation can be made over several tokens within one sentence. A single token sequence has several co-ref spans simultaneously.
   
   ==== Relations
   
  
positive.code: Depending on the layer behavior configuration, relation annotations can stack, can cross each other,
  cross sentence boundaries. 
  
  NOTE: Currently, there can be at most one relation layer per span layer and relation between spans
        of different layers are not supported.
  
  NOTE: A special behavior for the built-in *Dependency* layer is the handling of the dependency 
        root. To mark a token as the *ROOT* of the dependency tree, create a dependency relation from
        the POS tag a to itself (a circle). This behavior is not active for custom relation layers!
  
  NOTE: Not all arcs displayed in the annotation view are belonging to chain or relation layers. Some
        are induced by <<sect_annotation_link_features>>.
  
negative.code: 
  A click on the *Help* button displays the Guidelines for the tool and *The Annotator's Guide to NER-Annotation*.
  When you are finished with annotating or curating a document, please click on the *Done*
  button, so that the document may be further processed. If the button above the *Done* is a cross symbol, it means the documents have already been finished. If the symbol has a tick, it is still open.
  
  image::annotation4.jpg[align="center"]
  
  