Hi Thomas,
This is an excellent description and is inline with our implementation.


From: 30032744440n behalf of
Sent: Monday, November 26, 2018 11:43 pm
To: Openehr-Technical
Subject: Better definition of 'system_id' attribute in openEHR sytems

Following SPECPR-99<https://openehr.atlassian.net/browse/SPECPR-99> andthis 
 from 2014, the imminent RM 1.0.4 release will include 
SPECRM-80<https://openehr.atlassian.net/browse/SPECRM-80>, which improves the 
documentation about system_id, which is recorded in the EHR and also in 
AUDIT_DETAILS, i.e. on each committed version.

In response to this, I have added the following documentation to the 
Architecture Overview, and will also add further text and hot links to the 
specific locations in the EHR and Common parts of the RM. It would be useful to 
know if this agrees with the understanding of openEHR system implementers and 


6.1. The EHR System

The notion of a logical EHR system is central to the openEHR architecture. In 
openEHR, a system is understood as a distinct logical repository corresponding 
to an organisational entity that islegally responsible for the management and 
governance of the healthcare data contained within. This may be a regional 
health service that serves multiple provider enterprises or a single provider 
enterprise such as a larger hospital. The 'system' is therefore in general 
distinct from specific applications and also from provider organisations, even 
if in some cases it happens to be owned by a single provider. It is also 
distinct from any underlying virtualisation infrastructure or cloud computing 
facility, which may house multiple logical EHR systems in a multi-tenant 
fashion. This is clear by comparing the legal responsibilities of the 
infrastructure provider, which are forgeneric IT service management to a 
procurer, which may be a healthcare data management entity. It is the latter 
that undertakes legal responsibility for the content, on behalf of one or more 
healthcare provider organisations.

The technical criterion for identifying an EHR system is that it is the entity 
that assigns version identifiers within a repository.

6.1.1. System Identity

Within the openEHR architecture, a system_id attribute is recorded both within 
each patient EHR (EHR class), and also within the audit created with each 
commit of data to an EHR (AUDIT_DETAILS class). This identifier identifies the 
logical EHR system as described above, and may be of any form. Common forms 
include the reverse domain name and plain and structured string identifiers. 
The system identifier isnot assumed to be directly processable, but may instead 
be used as a key, for example in a service maintaining location information.
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