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Creating or transforming a BLOB output message using a graphical data map
Use the Graphical Data Mapping editor to create or transform a WebSphere® Message Broker message using the BLOB message domain.
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 graphical data map file from a Mapping node.
The BLOB message provides a single element value of type xsd:hexBinary. When you create a BLOB message output, you must wire a transform to the value element in the BLOB message, which sets the hexBinary data that you require in the BLOB message.
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.