The sqlNullable modifier is an optional modifier for a parameter in a function declaration. This is the older of the two methods that EGL offers to add a null flag to a variable. The null flag allows you to set a variable to a null value.
EGL maintains this modifier for compatibility with earlier versions. Best practice for new code is to use the "?" type extension character to indicate a nullable variable. For more information, see "Type extension characters."
Note that the sqlNullable modifier works like the isSQLNullable property, and that this behavior is different from that of the "?" type extension character. For details, see isSQLNullable.
function fnctn1( x int inOut sqlNullable ) fnctn2( x ); end function fnctn2( y int? inOut ) y = null; end