With HostBridge, how and when are field names “bound” to values?
The binding between field names and values occurs during a one-time, preparatory step. It occurs (automatically) when the map is reassembled using the BMS map generation utility in CICS TS. The map generation utility creates a binding between a field name in the map and a field value in the ADS. This binding is expressed in a new data structure called the ADS Descriptor (ADSD). The ADSD contains a list of field names and offsets — the offsets indicate where within the ADS the data for a particular field can be found. The ADSD is stored in the same load module that contains the machine-readable version of the BMS map. As you can see, HostBridge is actually uninvolved in the binding between field names and values. This occurs in a one-time process performed before HostBridge ever enters the picture. Furthermore, the binding between field names and values is not based upon row/column coordinates specified by the user. Rather, the binding is created by CICS based on the actual field name
