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RepresentationCodeSourceEnum
ISO 11783 - DDI
ISO 11783 - SPN
J1939 - SPN
ADAPT
Proprietary

Representation
Id	CompoundIdentifier	1	Defined somewhere for ADAPT
Code	String	1	Code is a unique representation code that corresponds to the representation's ID in our reference data API / XML file.
Description	String	1
LongDescription	String	0..1
CodeSource	RepresentationCodeSourceEnum	0..1	The source for the reference id listed in the enumeration below

StringRepresentation
MinCharacters	Integer	0..1
MaxCharacters	Integer	0..1

NumericRepresentation
DecimalDigits	Integer	0..1
MinValue	NumericValue	0..1
MaxValue	NumericValue	0..1
Dimension	UnitOfMeasureDimensionEnum	1

EnumeratedRepresentation
EnumerationMembers	EnumerationMember	1..*
RepresentationGroupId	Integer	1

UnitType
Id	String	1
Name		1
CompondUnitOfMeasures	CompondUnitOfMeasure	1..n	List of support unit of measures
BaseUnitOfMeasure	CompondUnitOfMeasure	1	The base unit which will be used for conversion

CompoundUnitOfMeasure
Components	UnitOfMeasureComponent	1..n
Name	String	1
Symbol	String	1

UnitOfMeasureComponent
UnitOfMeasure	UnitOfMeasure	1
Power	Integer	1

UnitOfMeasure
Code	String	1	This is a string, according to the composite Deere scheme. e.g., m2
Name	String	1	e.g., "meter squared"
Symbol	String	1	e.g., "m^2"
UNRec20Code	String	1	e.g., "MTK"
ConversionScale	Double	1	e.g., 1
UnitType	UnitType	1	e.g. "area"

Examples

NumericRepresentation
Id	1001
Name	YieldWetMass
UnitType	MassType
RecordedValues	Array of double
RecordedUnitOfMeasure	kg

NumericRepresentation
Id	1002
Name	ApplicationRate
UnitType	VolumeAreaType
RecordedValues	Array of double
RecordedUnitOfMeasure	litres/ac
EnteredValues	Array of double
EnteredUnitOfMeasure	gallon/ac

NumericRepresentation
Id	1020
Name	SectionWidth
UnitType	LengthType
RecordedValue	10
RecordedUnitOfMeasure	in
EnteredValue	254
EnteredUnitOfMeasure	mm

CompoundUnitOfMeasure
Components	lb;ac-1
Symbol	lb/ac

UnitOfMeasure
Id	lb
Name	pounds
Conversion scale	1
UnitType	MassType

EnumeratedRepresentation
Id	2001
Name	HitchType
DefinedTypes	ThreePoint, RearTwoPoint, DrawBar, RearPivotWagonHitch, FrontRigidThreePoint
SelectedDefinedType	ThreePoint

EnumeratedRepresentation
Id	2002
Name	InlineOffsetType
DefinedTypes	InlineFront, InlineCenter, InlineRear
SelectedDefinedType	InlineFront

Note: SPADE and PAIL DDI would be listed as part of the ADAPT representation system.

Any DDI we do not understand should simply be passed through as-is
Use existing DDI's, or references to them, to represent well-known data representations
- Use ReferenceId if there is a corresponding ISO DDI
- Use CompoundIdentifier to track id, possibly domain specific id
- Consider migration path to promote agreed-upon data representations to ISO
UOM's and business rules: Should we be able to assign a unit to a RepresentationNumber that is not supported by its Representation?
Do we always need a Representation, or are there times we only need a number and UOM?
- Maybe only logged data meters need a representation
- Added UnitNumber so we can have a number and UOM without a representation.
Will need helper method to get value in particular unit or unit system
UN Rec20 - Excel sheet

ISO DDI has:

Numeric entity id
String "Definition"
List of Device Classes
- Do we need a DeviceClass enumeration? (Planters, Fertilizer, Sprayers, Irrigation, etc)
Unit
Resolution (What is this? Some kind of scaling factor?)
Range
Submit by / date / company
Revision Number
Current Status (ISO-Published)
DateTime Status Date
Status Comments
Attachments