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hData is a set of specifications that have been developed with ease-of-implementation in mind. This page is a placeholder for a more comprehensive introduction to hData and its relationship to Micro ITS and greenCDA.

HData Specification Suite.png

hData requires strong separation of the technical representation and transport technology on the one side, and the clinical content of an electronic health record on the other side. To this end, hData has the concept of hData Content Profiles (HCP), which define what kind of content is represented and transport through hData.

Micro ITS and hData are complimentary. Conceptually, Micro ITS provides a generalized mechanism for defining Domain Specific Markup Languages (DSML) to represent RIM content models. The following diagram illustrates the integration pattern:

HData-HL7 Layer Cake.png


Strawman Draft Specifications

Requirements Document

Structured Document Template Design Pilot

hData is part of the Structured Document Template Design Pilot, progress can be tracked on the HData Template Sub Project page.

Presentation Material


Project hData was started by MITRE and is currently hosted on


Sample code and XML schemas capturing the HITSP/C32 profile of the HL7 CCD can be found on