anchor.diff:  
   Can't place this concept - synonym Woodwardia aspera (R.Br.) Mett. is part of accepted concept
   Doodia aspera R.Br.CHAH (2014), Australian Plant Census
  +
  +== Fixup edits
  +
  +We need to be able to edit past annotations and possibly synonomy that have been erroneously entered. These minor edits
  +are considered errata to a published tree (see https://www.anbg.gov.au/25jira/browse/NSL-2550[NSL-2550]).
  +
  +.From NSL-2550 Kirsten Kowley
  +----
  +    We would like the following to be included in "minor edits":
  +    1. deletion or edit of distribution
  +    2. deletion or edit of comment
  +    3. addition of a basionym
  +    4. addition of autonyms
  +    5. addition of orthographic variants
  +    6. addition of isonyms
  +
  +    We do not consider any of these to be a change of concept and therefore do not need a new instance.
  +
  +    We like the idea of having to provide a reason for the change and would like to suggest the following:
  +    1. Change in distribution
  +    2. Comment deleted
  +    3. Comment edited
  +    4. Basionym added
  +    5. Autonym added
  +    6. Orthographic variant added
  +    7. Isonym added
  +----
  +
  +Presenting the User Interface for making a fix like these needs to be consistent across the types of change and obvious
  +that you are changing the historical data.
  +
  +Accessing the historical data such as the Distribution and Comment data in the editor will potentially be a challenge as
  +they may be stored in older versions. We currently only edit the current version and a draft. It would be logical to use
  +previously used instances as the vector to the previous versions in the editor, as that works in a similar way to the
  +previous use of Instance Notes to provide this information.
  +
  +icon:question-circle[2x, role='yellow'] | Not an immediate problem, but: How do we handle other attributes people may need to edit for different trees?
  
positive.code: = Tree Placement Rules
  v1.0, March 2018
  :imagesdir: resources/images/
  :toc: left
  
negative.code: 
  === Check name validity (warning only)
  
  ACTION: Warn that you are placing an invalid name.
  
  The creates a warning if the name is *nom Illeg* or *nom Inval*. It does not stop you from adding the name.
  
  === Check the rank of the name is below it's parent
  
  ACTION: Prevents the taxon being placed.
  
  You can't place a lower rank above a higher one in the tree.
  
  === Check a polynomial name is below it's parent name
  
  ACTION: Prevents the taxon being placed.
  
  e.g. Doodia aspera must be placed below Doodia not Woodwardia because the name is *Doodia* aspera not *Woodwardia* aspera.
  
  === Check if the instance is already on the tree
  
  ACTION: Prevents the taxon being placed.
  
  Checks if the instance of the taxon is already placed on the tree. It will prevent the taxon being
  placed. In general you can replace an instance, but not with itself, so you would have to remove the existing instance
  first before placing it again, but this is almost always not what you want to do... [because??]
  
  === check Name Is Not On The Tree
  
  ACTION: Prevents the taxon being placed.
  
  Checks if the name of the taxon is already placed on the tree. You need to replace the accepted taxon.
  In general this shouldn't happen because the editor prevents it.
  
  === check Name Not An Existing Synonym
  
  ACTION: Prevents the taxon being placed.
  
  Checks if the name of the taxon is a synonym of name already placed on the tree. You need to replace
  or modify the accepted taxon.
  
  === check Synonyms Of Name Not On The Tree
  
  ACTION: Prevents the taxon being placed.
  
  This checks if any of the synonyms of the taxon you are placing is a name already placed on the tree. You need
  to replace or modify the accepted taxon.
  
  === check Synonyms Are Not Synonyms On The Tree
  
  ACTION: Prevents the taxon being placed.
  
  This checks if any of the synonyms of the taxon you are placing are a synonym of any name already placed on the tree.
  You need to replace or modify the accepted taxon.
  
  == Synonym errors
  
  