attributeName	attributeDefinition	class	unit	dateTimeFormatString	missingValueCode	missingValueCodeExplanation
observation_ancillary_id	Identifier of the observation ancillary information.	character			NA	Not available
observation_id	A reference to an observation. References the observation_id field of the observation table.	character			NA	Not available
variable_name	Name of the measured variable.	categorical			NA	Not available
value	Value of the measured variable.	character			NA	Not available
unit	Unit of the measured variable.	character			NA	Not available
