[Note]inconsistent Boolean usage in model

In the newly uploaded model draft,there is a problem in using BooleanType 
on FE model schema:we define the BooleanType to be an enumeration only 
allowing "0" and "1",but when we use that to define port group attribute,we 
use "yes" and "no",so there is an inconsistency problem.I suppose the 
following solvements:
1 delete the BooleanType and use the built-in boolean.
2 keep the BooleanType and define the BooleanType as follows:(joes's 
suggestion)
 1) Change group="no"/"yes" to group="0"/"1". 
 2) Change booleanType to only allow "no" and "yes". 
 3) Change booleanType to "false" and "true", and find all uses and fix 
them to "false/"true" as well. 
 4) change boolean type to allow "0", "1" and "no", "yes", and "true", 
"false". 
 if we keep the definition,I suppose we use one of the above 
presentation,such as 2) or 3).
Any suggestion?
Yours,Fenggen

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