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TIBCO Rendezvous® 8.7.0

# Self-Describing Data

Self-describing data is data that has been annotated by the producer, so all consumers can interpret and use the data properly. Every message and every message field consists of self-describing data. Self-Describing Data presents the annotations that augment data so it is self-describing.

Self-Describing Data

Element | Description
Field Annotations
type | Producers must designate the type of every message field. Rendezvous software uses a set of wire-format datatype designations to characterize data by type and size. For example, the type `TIBRVMSG_I32ARRAY` denotes an array of 32-bit integers.
count (number of elements) | Producers must specify the length of all array data—that is, the number of elements in an array.
field name | Producers can label the fields of a message with names. Consumers use field names to select specific fields from messages.
field identifier | Producers can label the fields of a message with numeric identifiers. Consumers can use field identifiers to select specific fields from messages. All field identifiers in a message must be unique within that message.
Message Annotations
subject name | Producers must label every outbound message with a send subject name (also called the send subject name), which describes its content and destination set.
reply subject name | Producers can label an outbound message with a reply subject name, to which consumers can send reply messages.

## See Also

Data

Subject Names

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