Transcript What Are Mappings?

What Are Mappings?
A set of Mappings is a precise statement
of the equivalence between
two data structures or class models
A set of Semantic Mappings is a precise statement
of how a data structure
conveys the information in a class model
Data structure = XML, RDBMS
Types of Mapping
S2S
Structure 1
Structure 2
S2M
ITS 1
Class
Model 1
ITS 2
M2M
Class
Model 2
Mappings are the Only Basis for
Interoperability
• Before you write software to interface
between two data structures or models,
you must understand the equivalence
between them.
• That is the specification of the interface
software (and the basis for testing it)
• So write it down.
What do Semantic Mappings Look
Like?
They say:
This node (XPath, field) in the an instance of the data structure
represents this feature (object, property, link) in an instance
of the class model.
Demo 1: Making V2-V3 Mappings
See Notes page for this slide.
Demo 2: Running a Translation
Test
See Notes page for this slide.
The Use Case for V2-V3 Mapping
V2
V2 – V3 Mapping
V3 XML
V3 ITS
Homebrew 1
Mappings
V3
RMIM
System interfaces can use their own homebrew XML,
and then inter-operate freely with both V2 and V3.
Summary
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Mappings are the essential basis for interoperability
They should be written down
You could do this with Excel
Or you can use a tool which:
– Captures the models and structures you are mapping between
(so makes mapping easy)
– Validates the mappings
– Generates and runs translations from the mappings
– Does automated self-test of the translations and mappings
• Download the tool from the HL7 Homebase:
http://hl7projects.hl7.nscee.edu/
• Send feedback to [email protected]