Creating or transforming a BLOB output message by using a graphical data map

When you create a new map, the BLOB message is available under the "IBM® supplied message models" category in the map input and output selection tree. If you select a BLOB message as the map output, the output domain in the output message assembly is automatically set to BLOB. For more information about creating a new map, see Creating a message map from a Mapping node.

To populate the data of a BLOB message, you must wire a transform that will provide hexBinary formatted data to the child 'value' element of the message. You can use the built-in function iib:hexBinaryValue($<var>) in a Custom XPath transform, to format data into the required hex binary string.

When you transform a BLOB message, you must wire the value element of the input BLOB message into a transform that accepts an xsd:hexBinary type. For example, you could use a Move transform to set the BLOB binary data into an XML output message element that has either an xsd:hexBinary or xsd:base64Binary type.

If you are transforming only the Message Assembly headers and folders (for example, Properties and Transport headers), you can pass the message body data through unmodified by using the BLOB domain and a Move transform from the BLOB input message to the BLOB output message.