HL7 Infobutton Standard

The HL7 Context-Aware Knowledge Retrieval Standard provides a standard mechanism for EHR systems and knowledge resources to communicate, implementing infobutton capabilities. The Infobutton Standard consists of the following specifications (links to download the specifications at the HL7 Web site are provided below):
The Infobutton Standard is being continuously improved and expanded. Conference calls are held every other Tuesday at 4pm ET and are open to the public. Minutes, slide decks, and draft specifications are posted to the HL7 Clinical Decision Support Work Group site.  

In addition to the specifications above, the following resources provide a good overview for those who are getting started:

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