sending multiple record types in a request - how?

Let's say that I want to send a couple different kinds of
object/record types in a single request. e.g. a new customer and a
couple purchase orders for it.

Assume each record type can be handled like a flat array of name-value
pairs.

How best to do that?

I think of an 'array' as a single-column list of values. A 'struct' as
a flat table (each 'member' being a row); actually,  more like single
record, which each 'member' being a name-value pair (field-name and
its value). So if I'm passing multiple flat records, that would be an
array of structs?

So if I want to send a couple different types of records, with
multiple instances of 1 of those types, I might have...

* an array to represent passing multiple object types

 * a value for each type

  * a single struct for the single record of one type

  * an array of structs for multiple records of a single type

Does this make sense? I've read a fair number of documents, but
they're all rather simple in structure. Is the next level of data
model complexity documented anywhere with some decent explanations
and/or examples?




 
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