Hsc 2008 Day 2

Supporting Your Success in Health
1

HealthVault
The Taxonomy and Evolution
of the HealthVault Data Model

Session Topics
Understanding the data model
• Data Types
• Vocabularies
• Transforms
• Versioning
Working with the data model
• Approaches
• Tools & Resources
• Discovery & investigation
• Mapping
– Extending data types
– Creating custom data types
– Request updates


The HealthVault Data Model

4

Data Type Design Principles
• Consumer-centric
– Data that is useful for customers
• Small atomic types
– Easier to create and update
• Interoperable
– Interoperate with industry standards in actual use
• Inclusive
– Support fully structured data and unstructured information
• Just in Time
– Create types as we work with partners fluent in specific domains
• Independent
– Allow expression of connections but never rely on their existence

6

Exploring a data type
• Understanding family-history-person
– Describes a relative
• Inlaws and outlaws (mom, dad, sister, brother, aunt
uncle)
– Stores the following information
• Relative name
• Relationship of relative
• Date of birth
• Date of death
– Used in conjunction with family-history-condition
• Stores information about relative’s conditions


family-health-person Schema

t:person

<element name=quot;relative-namequot; type=quot;t:personquot;>
<annotation>
<documentation>
t:codable-value
<summary>
The name and other information about the relative.
</summary>
</documentation>
</annotation>
</element> d:approx-date

Supporting Your Success in Health d:approx-date

t:person
• Base data types are intended to be
used across multiple thing types
• Examples
– Person
– Dates
– Measurements
– Etc.


.NET Wrappers
PersonItem RelativeName
t:person

CodableValue Relationship
class FamilyHistoryPerson t:codable-
value

ApproximateDate DateOfBirth
d:approx-date

ApproximateDate DateOfDeath

d:approx-date


.NET Wrapper Classes
• Each schema type has an analogous .net class
– Thing types are derived from HealthRecordItem
– Base types are derived from HealthRecordItemData

• Some types predate our naming convention
– t:person base type wrapper is PersonItem
– t:approxDate wrapper is ApproximateDate

• We are considering some wrapper class renaming to fix a few issues in
this area, and will be asking for your feedback


Codable Value
PersonItem RelativeName
t:person

CodableValue Relationship
class FamilyHistoryPerson t:codable-
value

ApproximateDate DateOfBirth
d:approx-date

ApproximateDate DateOfDeath

d:approx-date


Codable Value

• Many fields have two uses
• A user-entered string
• An application-understandable code
• Often tied to a specific vocabulary
• Example
• Medication codes
• Aerobic exercise types
• CodableValue combines both uses


Codable Value

Family History Person Relationship

Text: Grandmother

Code Vocabulary
GMt personal-relationship personal-relationship vocabulary
GMt-M
Key Display Text
Bro Brother
GMt Grandmother
Csn Cousin
Mth Mother


Data Transforms
• Platform-implemented transforms from thing xml to a
different format
• mtt – summarize instance values
• stt – important columns from the instance

• These transforms are used by the
HealthRecordItemDataGrid


Form transform
• Html version of the data

• Not supported for all types – changes coming in the future

Updating data types… Health Record

.NET SDK V2 Encounter
V2
Encounter
Application Instance
V2
(new fields)

Missing New
require fields
d fields
.NET SDK V1

Application Encounter
V1 Encounter
V1
Instance


With Versioning… Health Record

.NET SDK V2 Encounter
V2
Encounter
Application Instance
V2
(new fields) Encounter Transfor
V2 m
XML

Encounter Transfor
.NET SDK V1 V1 m
XML
Application Encounter
V1 Encounter
V1
Instance


Versioning details
• Limitations
– Can’t perform updates across versions
– Only works instance to instance
• Can’t transform to multiple instances

• Will be released in PB6
– Some recent types hand-versioned
• Encounter / EncounterOld
• These will become one type after versioning is
deployed


Big types vs multiple small types
• Big types:
– More likely to require modifications
– Modifications require versioning
– Harder to understand

• Multiple small types
– Less likely to require versioning
– Modify through adding new types

• Multiple smaller types are better
– How do you relate them together?


Related Items

Weight Aerobic Session

Key = <X> Key =<Y>
<Y>

Related Items Blood Pressure
Key =<Z>
<Z>

• Applications must follow the links themselves
• Referential integrity is not enforced
– Applications must deal with links to items that don’t
exist
• Links are one-way


Working with the HealthVault
data model

Where to start?
Should I start by understanding everything about things?
HealthVault? , I though t they were
CD Item Types
g as a C
e verythin
st store
Ca n’t we ju We already
database s have a MTT se
o can we ju ems lik
st e an ea
I’m alre give you o sy way
ady usi ur structure to start…
ng indu ?
should stry sta
I start th ndards,
ere?
Maybe I’ll w
an ait to start a
t fter the next
ust inser version of th
ould I j e data…
Here’s our suggested approach…
C
STT and
be d on
e?

I a lr e Easy, Where should I go to see all the
ady d the an
Healt o swer m HealthVault vocabularies?
hVau CCR out ust be
to star
lt d o p
the r ut, can t with
the XM
est? L…

Wouldn’t it be best to st Wait, now what was that base thing
art
with building a list of al type again?
l
related data?

in st the
data aga You menti
dating my oned trans
forms, is th
rt by vali data? ere already
I kno w, I’ll sta one for my
XSD…


Start with a Data Inventory

Integrating an existing application?
Make a list of what you have now

Creating a new application?
Make a list of what you plan to have
Blood Pressure Readings
Is it appropriate to store in HealthVault?
As a general rule, if it provides value to the Medications
consumer’s health record, it’s appropriate
Patient Information
to store in HealthVault. It becomes even
more valuable when it can be reused Bank Account Info
across systems.
Extended Health Info

Super-Secret Company Info


Discover the HealthVault Data Types

Now that you have your data inventory…
Time to learn about the HealthVault data
types

Tools to make this easier:
MSDN
Online Library
Data Type Reference
Blogs
Community Forum
Utilities

.NET SDK


Discover where data type matches exist

You’ve done your data inventory and reviewed the HealthVault data type.
Now it’s time to map your data between the systems
Start by identifying the set of matching data types

Condition
Body Composition
Medication
Demographics Medication
Condition
Personal Demographic Information
Basic Demographic Information


Map fields across data types
You have the set of matched data types.
Next step is to see how each field compares between the systems

Example 1 - the 100% match


Mapping fields across multiple data types
What to do when there isn’t a 100% match to a single data type
Look across other similar data types

Example 2 - the 100% match across multiple data types


What to do when there are missing fields
Some fields may not map to any fields in HealthVault
Determine if they should be part of HealthVault or if they are proprietary

Example 3 - the partial match with some new and proprietary fields

What about these?


What to do when there are missing fields
Some fields may not map to any fields in HealthVault
Determine if they should be part of HealthVault or if they are proprietary

Example 3 - the partial match with some new and proprietary fields

These are calculated values or measurements and
are excellent candidates for HealthVault additions

These two provide value to the consumer’s health
record but may not be easily shared across
applications.


HealthVault Data Type Updates



Requesting an update
Requesting an update

Please include:
Please include:
What you’re trying to accomplish
What you’re trying to accomplish
Consumer and system use of the data
Consumer and system use of the data
Samples of existing data
Samples of existing data

What we do:
What we do:
–Review the request
–Review the request
–Post a Request for Interest to the blog
–Post a Request for Interest to the blog

What we ask of you:
What we ask of you:
Unblock your development
Unblock your development
–Use a data type extension
–Use a data type extension
–Use a custom data type
–Use a custom data type



Research & Design
Research & Design

What we do:
What we do:
Review all collected materials
Review all collected materials
–Is it right for HealthVault
–Is it right for HealthVault
–Are there other types that would satisfy?
–Are there other types that would satisfy?
–Should this be a new data type?
–Should this be a new data type?
–Ask a lot of questions
–Ask a lot of questions
Pull in domain experts as needed
Pull in domain experts as needed
Find similarities across existing data types
Find similarities across existing data types
Document standards and vocabularies
Document standards and vocabularies
Create the draft design
Create the draft design



Reviewing the draft design
Reviewing the draft design

What we do:
What we do:
Post a Request for Review on the blog
Post a Request for Review on the blog
–Design write-up
–Design write-up
–May include a graphical representation
–May include a graphical representation
Hold internal reviews
Hold internal reviews

What we ask of you:
What we ask of you:
Review the design
Review the design
Provide comments
Provide comments



Releasing the update
Releasing the update

What we do:
What we do:
Review and incorporate all feedback
Review and incorporate all feedback
Create appropriate transforms
Create appropriate transforms
Create .NET SDK
Create .NET SDK
Deploy to platform and MSDN
Deploy to platform and MSDN

What we ask of you:
What we ask of you:
Download new SDK
Download new SDK
Update applications to use new data types
Update applications to use new data types


Learn More About The HealthVault Data Model
HealthVault Developer Center on MSDN
http://msdn.microsoft.com/healthvault
– Getting Started Guide
– Online Libraries
– Go-Live Guide
– HealthVault SDK & DDK
– Blogs & Forum

HealthVault Data Types blog
http://blogs.msdn.com/healthvaultdatatypes/default.aspx
– Latest data type information available


Need Help?
These companies have built HealthVault-compatible applications or device drivers
and are eager to help you:


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