## UnitDefinition

typecode = SBML_UNIT_DEFINITION

## SBML Level 1

Version 1 | Version 2
Fieldname | Type
--- | ---
`typecode` | as above
`notes` | string
`annotation` | string
`name` | string
unit | array of structures
Fieldname | Type
--- | ---
`typecode` | as above
`notes` | string
`annotation` | string
`name` | string
unit | array of structures

## SBML Level 2

Version 1 | Version 2
Fieldname | Type
--- | ---
`typecode` | as above
`metaid` | string
`notes` | string
`annotation` | string
`name` | string
`id` | string
unit | array of structures
Fieldname | Type
--- | ---
`typecode` | as above
`metaid` | string
`notes` | string
`annotation` | string
`name` | string
`id` | string
unit | array of structures

Version 3 | Version 4
Fieldname | Type
--- | ---
`typecode` | as above
`metaid` | string
`notes` | string
`annotation` | string
`sboTerm` | integer
`name` | string
`id` | string
unit | array of structures
Fieldname | Type
--- | ---
`typecode` | as above
`metaid` | string
`notes` | string
`annotation` | string
`sboTerm` | integer
`name` | string
`id` | string
unit | array of structures

## SBML Level 3

Version 1
Fieldname | Type
--- | ---
`typecode` | as above
`metaid` | string
`notes` | string
`annotation` | string
`sboTerm` | integer
`name` | string
`id` | string
unit | array of structures