# Data Transformation

Substation ES effectively transforms data from different mainframe sources to TIBCO messaging applications and vice versa.

The following figure shows the message flow for data transformation:

1. A client application (1) reads records from a database or files and publishes each record to Substation ES as an opaque message. The structure of the record need not be known to the application at this point.
2. ESB Interface (4) receives the record, performs no data conversion on the input, and simply hands it to Substation ES Administration Interface (5).
3. Substation ES Administration Interface (5) hands the record back to ESB Interface (4), where an outbound conversion occurs, depending on the configuration specified.
4. The record, now converted as a Rendezvous or Enterprise Message Service message, can be published to a subscribing TIBCO messaging application (2).

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