How would you represent a Marker Tag in JSON format when not used?

Use the Zinc Formats Operation (http://project-haystack.org/doc/Ops) for example. The Receive property in the first row is not used, so it is blank.

ver:"3.0"
mime,receive,send
"text/csv",,M
"text/plain",M,M
"text/zinc",M,M

I understand it would be "m:" for JSON if used. but how would you represent when not used?

A "" would be confusing as you could mistake for empty String Tag when parsing and null would be confused for a Null Tag. I don't think JSON allows for a blank.

It seems like a scenario like this, the Receive and Send properties would be a Boolean Tag so it could be true or false.

Thanks in advance.

You omit the name value pair in the row (or you can use null):

{"meta": {"ver":"3.0"}, 
 "cols":[ {"name":"name"}, {"name":"mime"}, 
          {"name":"receive"}, {"name":"send"} ], 
 "rows":[ 
   {"name":"zinc", "mime":"text/plain", "receive":"m:", "send":"m:"}, 
   {"name":"csv", "mime":"text/csv", "send":"m:"} 
 ] }

Thanks Brian, I will review and update my code.

I have another question based on your example. It appears you added a column for "name". This is not shown as a property/column in the Formats section in documentation. Which one is correct? To include "name" or not include?

Thanks again for the help.

You don't need name - I just copied that from our software and we add a few more columns