CWF supports the handling of explicit NULL values within
messages, if the logical nillable property of the element is set.
An explicit null is identified by a specific value that identifies
an element as being null.
The Boolean Null Value can
be specified at the message set level, and applies to the Boolean
elements of all messages that are defined in that message set. The
null value of all other element types can be specified individually
for each element.
CWF supports the representation of null values by using the Encoding Null and Encoding Null Value element properties.
Together, this information controls how null values are handled by
the MRM parser.
The Encoding Null property
can be set to one of four values:
- NullLogicalValue
-
The Encoding Null Value property
is interpreted as a logical value. Therefore, if its value is set
to 0, for example, both 0 and 0.00 are
interpreted as null values.
- NullLiteralValue
-
The Encoding Null Value property
is interpreted as a string value. Therefore, the value of the element
in the bit stream must match exactly the value that is specified to
be interpreted as a null value.
- NullPadFill
-
Used for fixed-length elements. On output, any element with
a null value is padded to the appropriate length with the specified
padding character.
- NullLiteralFill
-
The Encoding Null Value property
is interpreted as a single character string value. Therefore, each
character of the value of the element in the bit stream must match
exactly the character value specified to be interpreted as a null
value.