Messages : Data Type Conversion

Data Type Conversion
Table 7 summarizes legal datatype conversions. The symbol X in Table 7 indicates that a value written into a message as the row type can be extracted as the column type. This table applies to all message values—including map pairs, headers and properties—except as noted below.
Notes
Values written as strings can be extracted as a numeric or boolean type only when it is possible to parse the string as a number of that type.