Issue file: dexlib/docs/issues/issues.xml
               Issue:
               RBN-1 by Rob Bodington (05-09-02) minor_technical issue /IGNORE is used inconsistently throughout the capabilities.
According to AP239 annex and dexlib/help/dex/implementor_trans.xml, the following should be used.
In particular optional values should default to '$' and only be set to '/IGNORE' if there is a value assigned.
| 
                   Value  | 
               					
               
                   Description  | 
               				
            
|---|---|
| '' | indicates user data managed by the sending system but not provided for data exchange. | 
| '/NULL' | indicates user data in a mandatory attribute that is not managed by the sending system or currently not known. | 
| '$' | $ is used in the physical file, if an optional attribute is not instantiated. | 
| '/IGNORE' | Attribute values are set to '/IGNORE' when the information that could be held by the attribute is instead assigned to the instance of the entity. | 
Comment: (Rob Bodington 05-09-21)
The proposal is that wherever an attribute should not be used, i.e. it should have been removed from the model as assignment is used instead, it should be populated with /IGNORE, regardless of whether the attribute is used or not. This means that any translator does not have to parse the attributes to determine whether there is an assignment holding the value or not. This should be consistent through out.
Comment: (Sean Barker 06-01-16)
Table revised, but question of whether this is purely for instance diagrams or whether the transferred data could contain $ raised.
               Issue:
               RBN-3 by Rob Bodington (05-09-21) minor_technical issue 
               Issue:
               RBN-4 by Rob Bodington (05-09-21) minor_technical issue 
               Issue:
               RBN-5 by Rob Bodington (05-09-21) minor_technical issue 
               Issue:
               RBN-8 by Rob Bodington (05-09-21) minor_technical issue Comment: (Rob Bodington 05-09-21)
The P28 examples will be very large. We should provide a set of test examples outside of the capabilities. Each DEX should have a full example.
               Issue:
               RBN-9 by Rob Bodington (05-09-21) minor_technical issue 
               Issue:
               RBN-10 by Rob Bodington (05-09-21) minor_technical issue 
               Issue:
               RBN-11 by Rob Bodington (05-09-21) minor_technical issue 
               Issue:
               RBN-12 by Rob Bodington (05-09-21) minor_technical issue 
               Issue:
               GYL-1 by Leif Gyllstrom (05-10-04) minor_technical issue 
               Issue:
               GYL-2 by Leif Gyllstrom (05-11-07) minor_technical issue 
               Issue:
               GYL-3 by Leif Gyllstrom (05-12-09) minor_technical issue 
               Issue:
               RBN-2 by Rob Bodington (05-09-05) minor_technical issue Comment: (Rob Bodington 05-09-21)
We should use ISO 10303-239 PLCS.
               Issue:
               RBN-6 by Rob Bodington (05-09-21) minor_technical issue Comment: (Leif Gyllstrom 05-10-04)
Added. However, the name of the Template has been changed to assigning_business_specific_reference_data.
               Issue:
               RBN-7 by Rob Bodington (05-09-21) minor_technical issue Comment: (Rob Bodington 05-09-21)
Agreed.