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    • Change Description:
      Hide
      The following changes are made:
      - new classes OBJECT_VERSION_ID and VERSION_TREE_ID is added to
        support.identification - used to support distributed version
        identification
      - New class LOCTABLE_REF is added to support.identification
        to the common.change_control package - this type is the logical
        correspondent to DV_EHR_URI
      - the attribute VERSION.version_id is renamed to version_tree_id
        and its type changed to VERSION_TREE_ID
      - a new creating_system_id attribute is added to the VERSION class,
        of type OBJECT_ID
      - the function VERSION.uid is changed so that it returns an OBJECT_VERSION_ID.
      - the explanation is improved to describe the new semantics of version
        identification, copying and moving.
      - in the class REVISION_HISTORY_ITEM, rename the attribute revision to "version" for
        consistency and change its type to OBJECT_VERSION_ID
      - move the "version" function defined on the class OBJECT_ID in the support IM to only
        the subtypes that want it; currently it is incompatible with versioning as defined
        in this CR, and is actually incorrect. The reason is that a single OBJECT_ID (e.g
        a GUID or ISO Oid always identifies a particular instance; if the instance in question
        happens to be a version of something that is changing in time, then the OBJECT_ID is
        an identifier for a single version. What this CR provides is a more structured and
        computable way of identifying versions.
      - rename the attributes of HIER_OBJECT_ID to be the same as the HL7 II class - there is
        no point being different.
      - add another descendant class of UID, called INTERNET_ID, defined as a reverse
        internet domain id, to support system identification
      - in the demographic model, correct PARTY.reverse_relationships to be a Set of
        LOCTABLE_REF
      - also in the demographic model, correct ACTOR.roles to be a Set of HIER_OBJECT_ID
        and ROLE.performer to be a HIER_OBJECT_ID
      - in the EHR IM, correct EHR.ehr_id and system_id to both be of type HIER_OBJECT_ID
      Show
      The following changes are made: - new classes OBJECT_VERSION_ID and VERSION_TREE_ID is added to   support.identification - used to support distributed version   identification - New class LOCTABLE_REF is added to support.identification   to the common.change_control package - this type is the logical   correspondent to DV_EHR_URI - the attribute VERSION.version_id is renamed to version_tree_id   and its type changed to VERSION_TREE_ID - a new creating_system_id attribute is added to the VERSION class,   of type OBJECT_ID - the function VERSION.uid is changed so that it returns an OBJECT_VERSION_ID. - the explanation is improved to describe the new semantics of version   identification, copying and moving. - in the class REVISION_HISTORY_ITEM, rename the attribute revision to "version" for   consistency and change its type to OBJECT_VERSION_ID - move the "version" function defined on the class OBJECT_ID in the support IM to only   the subtypes that want it; currently it is incompatible with versioning as defined   in this CR, and is actually incorrect. The reason is that a single OBJECT_ID (e.g   a GUID or ISO Oid always identifies a particular instance; if the instance in question   happens to be a version of something that is changing in time, then the OBJECT_ID is   an identifier for a single version. What this CR provides is a more structured and   computable way of identifying versions. - rename the attributes of HIER_OBJECT_ID to be the same as the HL7 II class - there is   no point being different. - add another descendant class of UID, called INTERNET_ID, defined as a reverse   internet domain id, to support system identification - in the demographic model, correct PARTY.reverse_relationships to be a Set of   LOCTABLE_REF - also in the demographic model, correct ACTOR.roles to be a Set of HIER_OBJECT_ID   and ROLE.performer to be a HIER_OBJECT_ID - in the EHR IM, correct EHR.ehr_id and system_id to both be of type HIER_OBJECT_ID
    • Approved By:
      ARB

      Description

      Currently the openEHR Common model supports Contributions whose
      contents may be Compositions from other systems. However, it does
      not cleanly support the synchronisation of Contributions from one
      system to another, such that the source systems and Contributions
      can be identified (there no problem in applying the content of a
      remote Contribution to a target system, just in identifying the
      originating Contribution).

      In a distributed, caching EHR computing environment, these semantics
      would be needed, in a similar way to synchronisation of change-sets
      between instances of software configuration management software such
      as Subversion or BitKeeper.

      A version identification system is also needed to support globally
      unique identification of versions in such a way that clashes are
      avoided when copies, moves and merges are made.

      Various anomalies in the existing models can be fixed by a proper
      version identification scheme:
      - demographic model - PARTY.reverse_relationships cannot just be
        a uid
      - referencing of CONTRIBUTION from VERSION and vice-versa
      - how a DV_EHR_URI relates to the various identifiers

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            • Assignee:
              OLDthomasbeale OLDthomasbeale
              Reporter:
              OLDthomasbeale OLDthomasbeale
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              • Created:
                Updated:
                Resolved: