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Difference between revisions of "CDA R3 Right Hand Side of Model Analysis"
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** Administrative and Financial Data needs to be addressed | ** Administrative and Financial Data needs to be addressed | ||
** Consideration of Common product Model, Public health Model. | ** Consideration of Common product Model, Public health Model. | ||
+ | ** Adopt existing extensions | ||
* Consistency: | * Consistency: | ||
Line 61: | Line 62: | ||
*** Principles Support | *** Principles Support | ||
*** Wire format | *** Wire format | ||
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− | |||
− | |||
− | |||
− | |||
* Implementation: | * Implementation: | ||
** Enter into the architecture at varying degrees of sophistication (levels of CDA) | ** Enter into the architecture at varying degrees of sophistication (levels of CDA) | ||
** Simplicity for implementers | ** Simplicity for implementers | ||
+ | *** May differ for different implementers (e.g. folks with single purpose vs. those with broader use case) | ||
** Limited/Fixed set of CDA -Schemas- Instance formats for implementers | ** Limited/Fixed set of CDA -Schemas- Instance formats for implementers | ||
** Explicit schema validation support for RIM based extensions | ** Explicit schema validation support for RIM based extensions | ||
Line 84: | Line 81: | ||
= Potential Solution Notes = | = Potential Solution Notes = | ||
− | * | + | * Take the SDA Approach, build one model that has four choice boxes [one for each backbone class]... |
+ | * Calvin's idea: for those RIM portions that aren't clearly in scope, provide an extension mechanism such that they validate against the CDA R3 schema. | ||
* Ensure that use of components is invariant (e.g., C-METS) for some period of time based on review. | * Ensure that use of components is invariant (e.g., C-METS) for some period of time based on review. |
Revision as of 22:57, 3 November 2009
SDWG page.
Contents
CDA R2 Design Principles
The goals of the CDA are:
- Give priority to delivery of patient care.
- Allow cost effective implementation across as wide a spectrum of systems as possible.
- Support exchange of human-readable documents between users, including those with different levels of technical sophistication.
- Promote longevity of all information encoded according to this architecture.
- Enable a wide range of post-exchange processing applications.
- Be compatible with a wide range of document creation applications.
- Promote exchange that is independent of the underlying transfer or storage mechanism.
- Prepare the design reasonably quickly.
- Enable policy-makers to control their own information requirements without extension to this specification.
A number of design principles follow from consideration of the above goals:
- This architecture must be compatible with XML and the HL7 RIM.
- This architecture must be compatible with representations of clinical information arising from other HL7 committees.
- Technical barriers to use of the architecture should be minimized.
- The architecture specifies the representation of instances required for exchange.
- The architecture should impose minimal constraints or requirements on document structure and content required for exchange.
- The architecture must be scalable to accommodate fine-grained markup such as highly structured text and coded data.
- Document specifications based on this architecture should accommodate such constraints and requirements as supplied by appropriate professional, commercial, and regulatory agencies.
- Document specifications for document creation and processing, if intended for exchange, should map to this exchange architecture.
- CDA documents must be human readable using widely-available and commonly-deployed XML-aware browsers and print drivers and a generic CDA style sheet written in a standard style sheet language.
- Use open standards.
CDA R3 scope statement
- CDA R2 scope
- common clinical documents generated at point of care
- public health reporting
- ... (Liora, Grahame preparing a draft) ...
CDA R3 requirements for right side of model
- Scope:
- All CDA R2 requirements continue to be in scope.
- Approved formal proposals and those proposals already assigned to workplan.
- CDA R3 project scope statement approved by TSC.
- Support for those domain models from other committees that are within CDA R3 scope.
- Support for that portion of the RIM that is within CDA R3 scope.
- Administrative and Financial Data needs to be addressed
- Consideration of Common product Model, Public health Model.
- Adopt existing extensions
- Consistency:
- Consistency types
- Between CDA R3 and V3 messages (limited by degree of consistency between message models)
- Between different CDA R3 implementation guides
- Between CDA R2 and CDA R3
- Semantic consistency (at level of RIM class, attribute, relationships, vocab, etc).
- A machineable back and forth translation between CDA R3 and (in scope portion of) message model for a given domain.
- Does not imply use of identical XML element names.
- Support for domain (analysis) models from other committees
- Internal consistency across domains
- Clear forwards migration path from CDA R2
- Principles Support
- Wire format
- Consistency types
- Implementation:
- Enter into the architecture at varying degrees of sophistication (levels of CDA)
- Simplicity for implementers
- May differ for different implementers (e.g. folks with single purpose vs. those with broader use case)
- Limited/Fixed set of CDA -Schemas- Instance formats for implementers
- Explicit schema validation support for RIM based extensions
- Support for schema tooling (e.g., binding, API creation, et cetera). (GG: support how?)
- Identical XML between HL7 V3 standards:
- May want to consider a different ITS
Potential Metrics for decision making
- How much work required on HL7's part to produce?
- Expressivity
Potential Solution Notes
- Take the SDA Approach, build one model that has four choice boxes [one for each backbone class]...
- Calvin's idea: for those RIM portions that aren't clearly in scope, provide an extension mechanism such that they validate against the CDA R3 schema.
- Ensure that use of components is invariant (e.g., C-METS) for some period of time based on review.