Structured Data TypeUnofficial Content

Structured Data Type (SDT)

Largely known as Record, Struct or Structure in most programming languages, it is the GeneXus object which allows defining complex data structures. An SDT represents data whose structure is made up of several elements like a Customer struct.

The SDT makes it easy to transfer parameters (more specifically, they allow providing/using structured information when using web services), it simplifies XML automatic reading and writing and makes it possible to manage variable-length lists of elements. 

More information:

Structured Data Type Object
Structured Data Type Properties
SDT Item properties
Samples KB 

More information in previous version (in Spanish)