Data Mapping Utility (DMU)

DDE Application Programming Interfaces (APIs)

The ENTITY (#1.5) file and DDE application programming interfaces (APIs) were originally developed as a Representational State Transfer (REST) service interface to VistA. DDE provides callable routines to support the REST GET action, using the Entity as a template to retrieve data from VistA as XML or JSON.

NOTE: To date, the REST verbs PUT, POST, and DELETE have not yet been implemented.

There are two DDE supported application programming interfaces (APIs):

• GET^DDE—Used for processing an Entity to retrieve multiple records.
• $$GET1^DDE—Used for processing an Entity to retrieve a single record.

NOTE: The PUT, POST, and DEL APIs are not supported.

Reviewed/Updated: May 2026