Input/Output expressions

I/O expressions are used to process multiple input or output documents in a single map.

I/O expressions can be used to:

Read from and write to multiple data sources.
Specify the location from which the data should be read or to which it should be written.
Switch to a different representation within a map.

These expressions are only allowed in elements that inherit from other structures.

The following examples illustrate some use cases for these expressions.

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