netcdf tmp_jsonconvention {
dimensions:
	d1 = 1 ;
variables:
	int v(d1) ;
		v:varconvention = "{\n\"key1\": [1,2,3], \"key2\": {\"key3\": \"abc\"}}" ;

// global attributes:
		:grpconvention = "{\"key1\": [1,2,3], \n\"key2\": {\"key3\": \"abc\"}}" ;
data:

 v = _ ;
}