What is included in the abstract message definition?

The abstract message definition encompasses various elements essential for understanding how messages are structured and function within HL7 standards. This includes the data fields sent within a message, which represent the core pieces of information being communicated. By specifying these data fields, the abstract message definition clarifies what information can be expected in a message and how it should be formatted.

In addition to data fields, valid response messages are also part of the definition. This component ensures that the system can appropriately interpret and respond to messages, maintaining the integrity of communication between different healthcare systems and applications.

Application level error treatments are included as well, as they address how to handle errors that may occur during the processing of messages. This aspect is crucial for maintaining the reliability and robustness of data exchange within healthcare IT systems.

Including all these elements in the abstract message definition provides a comprehensive framework for message creation and interaction, ensuring that all parties involved understand the structure and expectations of the messages being exchanged. Therefore, the complete inclusion of data fields, valid responses, and error treatments justifies the selection of the option indicating that all of the components are part of the abstract message definition.