HardwareDevice schemas

Type-specific details of hardware devices in the shared catalog.

Table of contents

1. How to use this family
2. Quick type map
3. Data acquisition
   1. Amplifier
   2. Camera
   3. Data acquisition system
   4. Electroencephalography system (EEG)
   5. Electromyography machine
   6. Ephys rig
   7. Fiber photometry system
   8. Force plate
   9. Humidity sensor
   10. Light sensor
   11. Magnetic resonance imaging (MRI) system
   12. Magnetoencephalography (MEG) system
   13. Magnetometer
   14. Microphone
   15. Miniscope
   16. Motion tracking system
   17. Ophys rig
   18. Optical Coherence Tomography (OCT)
   19. Oscilloscope
   20. Photodetector
   21. Signal processing unit
   22. Single-photon emission computed tomography (SPECT)
   23. Temperature sensor
   24. Ultrasound imaging system
4. Behavioral and stimulation tools
   1. Behavior rig
   2. Floating air platform
   3. Iontophoresis stimulator
   4. Laser
   5. LED driver
   6. Light emitter
   7. Running wheel
   8. Speaker
   9. Stimulation device
   10. Treadmill
5. Environmental controllers
   1. Anti-vibration table
   2. Humidity controller
   3. Noise isolation chamber
   4. Thermal controller
6. Surgical equipment
   1. Anesthesia system
   2. Injection system
   3. Micromanipulator
   4. Perfusion system
   5. Stereotaxic frame
   6. Surgical power tool
7. Miscellaneous
   1. Biosafety cabinet
   2. Computer
   3. Electronic component
   4. Fume hood
   5. Glass micropipette puller
   6. Microcontroller (e.g., Arduino)
   7. Microscope
   8. Monitor
   9. Single-board computer (e.g., Raspberry Pi)
8. External Identifiers

How to use this family

• hardwaredevice: set type to a type code below and send its properties in type_json.
• hardwaredeviceapproval: type selects the type; each log entry added through the entry actions is validated against it.
• Every version is published at https://www.brainstem.org/schemas/HardwareDevice/<Type>/<version>.json and never changes; https://www.brainstem.org/schemas/HardwareDevice/<Type>.json is the current version and https://www.brainstem.org/schemas/HardwareDevice/<Type>/ lists the versions. See Public schemas.
• Quantities are objects {"value": <number>, "unit": "<code>"}. Property paths with [] are inside a repeatable list of rows. The server sets the schema version field itself.

Quick type map

Type code	Title	Group	Version	Required properties	Schema
Amplifier	Amplifier	Data acquisition	1.0.0	none	1.0.0.json
AnesthesiaSystem	Anesthesia system	Surgical equipment	1.0.0	none	1.0.0.json
AntiVibrationTable	Anti-vibration table	Environmental controllers	1.0.0	none	1.0.0.json
BehaviorRig	Behavior rig	Behavioral and stimulation tools	1.0.0	none	1.0.0.json
BiosafetyCabinet	Biosafety cabinet	Miscellaneous	1.0.0	none	1.0.0.json
Camera	Camera	Data acquisition	1.0.0	none	1.0.0.json
Computer	Computer	Miscellaneous	1.0.0	none	1.0.0.json
DataAcquisitionSystem	Data acquisition system	Data acquisition	1.0.0	none	1.0.0.json
ElectroencephalographySystem	Electroencephalography system (EEG)	Data acquisition	1.0.0	none	1.0.0.json
ElectromyographyMachine	Electromyography machine	Data acquisition	1.0.0	none	1.0.0.json
ElectronicComponent	Electronic component	Miscellaneous	1.0.0	none	1.0.0.json
EphysRig	Ephys rig	Data acquisition	1.0.0	none	1.0.0.json
ExternalIdentifiers	External Identifiers (form only)		1.0.0	source, id	1.0.0.json
FiberPhotometrySystem	Fiber photometry system	Data acquisition	1.0.0	none	1.0.0.json
FloatingAirPlatform	Floating air platform	Behavioral and stimulation tools	1.0.0	none	1.0.0.json
ForcePlate	Force plate	Data acquisition	1.0.0	none	1.0.0.json
FumeHood	Fume hood	Miscellaneous	1.0.0	none	1.0.0.json
GlassMicropipettePuller	Glass micropipette puller	Miscellaneous	1.0.0	none	1.0.0.json
HumidityController	Humidity controller	Environmental controllers	1.0.0	none	1.0.0.json
HumiditySensor	Humidity sensor	Data acquisition	1.0.0	none	1.0.0.json
InjectionSystem	Injection system	Surgical equipment	1.0.0	none	1.0.0.json
IontophoresisStimulator	Iontophoresis stimulator	Behavioral and stimulation tools	1.0.0	none	1.0.0.json
Laser	Laser	Behavioral and stimulation tools	1.0.0	none	1.0.0.json
LedDriver	LED driver	Behavioral and stimulation tools	1.0.0	none	1.0.0.json
LightEmitter	Light emitter	Behavioral and stimulation tools	1.0.0	none	1.0.0.json
LightSensor	Light sensor	Data acquisition	1.0.0	none	1.0.0.json
MagneticResonanceImagingSystem	Magnetic resonance imaging (MRI) system	Data acquisition	1.0.0	none	1.0.0.json
MagnetoencephalographySystem	Magnetoencephalography (MEG) system	Data acquisition	1.0.0	none	1.0.0.json
Magnetometer	Magnetometer	Data acquisition	1.0.0	none	1.0.0.json
Microcontroller	Microcontroller (e.g., Arduino)	Miscellaneous	1.0.0	none	1.0.0.json
Micromanipulator	Micromanipulator	Surgical equipment	1.0.0	none	1.0.0.json
Microphone	Microphone	Data acquisition	1.0.0	none	1.0.0.json
Microscope	Microscope	Miscellaneous	1.0.0	none	1.0.0.json
Miniscope	Miniscope	Data acquisition	1.0.0	none	1.0.0.json
Monitor	Monitor	Miscellaneous	1.0.0	none	1.0.0.json
MotionTrackingSystem	Motion tracking system	Data acquisition	1.0.0	none	1.0.0.json
NoiseIsolationChamber	Noise isolation chamber	Environmental controllers	1.0.0	none	1.0.0.json
OphysRig	Ophys rig	Data acquisition	1.0.0	none	1.0.0.json
OpticalCoherenceTomography	Optical Coherence Tomography (OCT)	Data acquisition	1.0.0	none	1.0.0.json
Oscilloscope	Oscilloscope	Data acquisition	1.0.0	none	1.0.0.json
PerfusionSystem	Perfusion system	Surgical equipment	1.0.0	none	1.0.0.json
Photodetector	Photodetector	Data acquisition	1.0.0	none	1.0.0.json
RunningWheel	Running wheel	Behavioral and stimulation tools	1.0.0	none	1.0.0.json
SignalProcessingUnit	Signal processing unit	Data acquisition	1.0.0	none	1.0.0.json
SingleBoardComputer	Single-board computer (e.g., Raspberry Pi)	Miscellaneous	1.0.0	none	1.0.0.json
SinglePhotonEmissionComputedTomography	Single-photon emission computed tomography (SPECT)	Data acquisition	1.0.0	none	1.0.0.json
Speaker	Speaker	Behavioral and stimulation tools	1.0.0	none	1.0.0.json
StereotaxicFrame	Stereotaxic frame	Surgical equipment	1.0.0	none	1.0.0.json
StimulationDevice	Stimulation device	Behavioral and stimulation tools	1.0.0	none	1.0.0.json
SurgicalPowerTool	Surgical power tool	Surgical equipment	1.0.0	none	1.0.0.json
TemperatureSensor	Temperature sensor	Data acquisition	1.0.0	none	1.0.0.json
ThermalController	Thermal controller	Environmental controllers	1.0.0	none	1.0.0.json
Treadmill	Treadmill	Behavioral and stimulation tools	1.0.0	none	1.0.0.json
UltrasoundImagingSystem	Ultrasound imaging system	Data acquisition	1.0.0	none	1.0.0.json

Data acquisition

Amplifier

• type code Amplifier · version 1.0.0 · schema

An amplifier product for electrophysiological signals, described by its nominal specifications such as channel count, gain range, bandwidth, input impedance and noise level. Individual units in a lab’s setups are documented as equipment that refers to this entry.

Property	Title	Shape	Required	Allowed values	Meaning
productId	Product ID	text			A unique product identifier for the amplifier as defined by the supplier.
nChannels	Number of Channels	number		≥ 1	Number of input channels supported by the amplifier.
gain	Gain Range	text			Amplification gain range (e.g., ‘1x - 10,000x’, ‘1000x’).
bandwidth	Bandwidth	text			Frequency bandwidth of the amplifier (e.g., ‘DC - 10 kHz’, ‘0.1 Hz - 7.5 kHz’).
inputImpedance	Input Impedance	text			Input impedance specification (e.g., ‘>10 GΩ’, ‘1 MΩ’).
noiseLevel	Noise Level	text			Noise level specification (e.g., ‘<3 µV RMS’, ‘2.4 µV RMS’).
powerSupply	Power Supply	text			Power supply requirements (e.g., ‘+/- 15V’, ‘5V USB’, ‘Battery’).

Illustrative payload:

{
    "productId": "text",
    "nChannels": 1.0
}

Camera

• type code Camera · version 1.0.0 · schema

A camera product used for behavioral video or scientific imaging, with its nominal specifications and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Data acquisition system

• type code DataAcquisitionSystem · version 1.0.0 · schema

A data acquisition product, such as a DAQ board or multichannel recording system, that digitizes analog and digital signals, with its nominal specifications and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Electroencephalography system (EEG)

• type code ElectroencephalographySystem · version 1.0.0 · schema

An EEG system product for recording electrical brain activity from scalp or skull-surface electrodes, with its nominal specifications and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Electromyography machine

• type code ElectromyographyMachine · version 1.0.0 · schema

An EMG system product for recording the electrical activity of muscles, with its nominal specifications and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Ephys rig

• type code EphysRig · version 1.0.0 · schema

An integrated electrophysiology system sold as one product, such as a complete patch-clamp or extracellular recording rig, with its nominal specifications and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Fiber photometry system

• type code FiberPhotometrySystem · version 1.0.0 · schema

A fiber photometry system product that delivers excitation light through optical fibers and records fluorescence from genetically encoded indicators, with its nominal specifications and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Force plate

• type code ForcePlate · version 1.0.0 · schema

A force plate product that measures ground reaction forces, for example for gait or startle analysis, with its nominal specifications and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Humidity sensor

• type code HumiditySensor · version 1.0.0 · schema

A humidity sensor product for monitoring relative humidity in experimental or housing environments, with its nominal specifications and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Light sensor

• type code LightSensor · version 1.0.0 · schema

A light sensor product, such as an ambient light sensor or optical power meter, with its nominal specifications and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Magnetic resonance imaging (MRI) system

• type code MagneticResonanceImagingSystem · version 1.0.0 · schema

An MRI scanner model for structural or functional imaging, with its nominal specifications and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Magnetoencephalography (MEG) system

• type code MagnetoencephalographySystem · version 1.0.0 · schema

An MEG system model for recording the magnetic fields generated by neural activity, with its nominal specifications and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Magnetometer

• type code Magnetometer · version 1.0.0 · schema

A magnetometer product for measuring magnetic fields, for example for head-orientation tracking, with its nominal specifications and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Microphone

• type code Microphone · version 1.0.0 · schema

A microphone product for recording sound, including ultrasonic vocalizations, with its nominal specifications and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Miniscope

• type code Miniscope · version 1.0.0 · schema

A head-mounted miniature microscope product for imaging neural activity in freely moving animals, with its nominal specifications and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Motion tracking system

• type code MotionTrackingSystem · version 1.0.0 · schema

A motion tracking system product that records the position or posture of subjects, for example with infrared cameras and markers, with its nominal specifications and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Ophys rig

• type code OphysRig · version 1.0.0 · schema

An integrated optical physiology system sold as one product, such as a complete imaging rig, with its nominal specifications and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Optical Coherence Tomography (OCT)

• type code OpticalCoherenceTomography · version 1.0.0 · schema

An optical coherence tomography system product for depth-resolved, label-free tissue imaging, with its nominal specifications and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Oscilloscope

• type code Oscilloscope · version 1.0.0 · schema

An oscilloscope product for displaying and measuring electrical signals, with its nominal specifications and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Photodetector

• type code Photodetector · version 1.0.0 · schema

A photodetector product, such as a photodiode or photomultiplier tube, that converts light into an electrical signal, with its nominal specifications and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Signal processing unit

• type code SignalProcessingUnit · version 1.0.0 · schema

A signal processing product that filters, conditions or processes signals, for example in real time for closed-loop experiments, with its nominal specifications and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Single-photon emission computed tomography (SPECT)

• type code SinglePhotonEmissionComputedTomography · version 1.0.0 · schema

A SPECT scanner model for imaging the distribution of gamma-emitting radiotracers, with its nominal specifications and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Temperature sensor

• type code TemperatureSensor · version 1.0.0 · schema

A temperature sensor product for measuring body, bath or enclosure temperature, with its nominal specifications and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Ultrasound imaging system

• type code UltrasoundImagingSystem · version 1.0.0 · schema

An ultrasound imaging system product, used for example for functional ultrasound or anatomical imaging, with its nominal specifications and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Behavioral and stimulation tools

Behavior rig

• type code BehaviorRig · version 1.0.0 · schema

An integrated behavioral apparatus sold as one product, such as an operant chamber or commercial task system, with its nominal specifications and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Floating air platform

• type code FloatingAirPlatform · version 1.0.0 · schema

An air-lifted platform or homecage product that floats on a cushion of air for locomotion under head fixation, with its nominal specifications and supplier. Vibration isolation tables are Anti-vibration tables.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Iontophoresis stimulator

• type code IontophoresisStimulator · version 1.0.0 · schema

An iontophoresis current source product for applying drugs or tracers through micropipettes, with its nominal specifications and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Laser

• type code Laser · version 1.0.0 · schema

A laser product used for optogenetic stimulation, photostimulation or imaging, with its nominal specifications, such as wavelength and output power, and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

LED driver

• type code LedDriver · version 1.0.0 · schema

An LED driver product that powers and modulates LEDs, for example for optogenetic light delivery, with its nominal specifications and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Light emitter

• type code LightEmitter · version 1.0.0 · schema

An LED or other non-laser light source product used for optogenetic stimulation, visual stimulation or illumination, with its nominal specifications and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Running wheel

• type code RunningWheel · version 1.0.0 · schema

A running wheel product on which subjects run, often with an encoder for measuring locomotion, with its nominal specifications and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Speaker

• type code Speaker · version 1.0.0 · schema

A speaker product for delivering auditory stimuli, including ultrasonic sounds, with its nominal specifications and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Stimulation device

• type code StimulationDevice · version 1.0.0 · schema

A stimulator product, such as an electrical stimulus generator or stimulus isolator, with its nominal specifications and supplier. Use it for stimulation hardware that no more specific hardware type describes.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Treadmill

• type code Treadmill · version 1.0.0 · schema

A treadmill product, motorized or freely driven, on which subjects walk or run, with its nominal specifications and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Environmental controllers

Anti-vibration table

• type code AntiVibrationTable · version 1.0.0 · schema

An anti-vibration or optical table product used to isolate setups from floor vibrations, with its nominal specifications and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Humidity controller

• type code HumidityController · version 1.0.0 · schema

A humidity controller product for regulating humidity in housing areas, setups or enclosures, with its nominal specifications and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Noise isolation chamber

• type code NoiseIsolationChamber · version 1.0.0 · schema

A sound-attenuating chamber product that shields setups from external acoustic noise, with its nominal specifications and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Thermal controller

• type code ThermalController · version 1.0.0 · schema

A temperature controller product, such as a feedback-controlled heating pad or bath heater, with its nominal specifications and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Surgical equipment

Anesthesia system

• type code AnesthesiaSystem · version 1.0.0 · schema

An anesthesia system product, such as an isoflurane vaporizer or complete inhalation anesthesia station, with its nominal specifications and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Injection system

• type code InjectionSystem · version 1.0.0 · schema

An injection system product, such as a nanoliter injector or microsyringe pump, for delivering viral vectors, tracers or drugs into tissue, with its nominal specifications and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Micromanipulator

• type code Micromanipulator · version 1.0.0 · schema

A micromanipulator product for positioning electrodes, pipettes or optical fibers with micrometer precision, with its nominal specifications and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Perfusion system

• type code PerfusionSystem · version 1.0.0 · schema

A perfusion system product for transcardial perfusion or superfusion of tissue preparations, with its nominal specifications and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Stereotaxic frame

• type code StereotaxicFrame · version 1.0.0 · schema

A stereotaxic frame product that holds the subject’s head in a fixed coordinate system for targeting brain regions, with its nominal specifications and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Surgical power tool

• type code SurgicalPowerTool · version 1.0.0 · schema

A powered surgical tool product, such as a dental drill used for craniotomies, with its nominal specifications and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Miscellaneous

Biosafety cabinet

• type code BiosafetyCabinet · version 1.0.0 · schema

A biosafety cabinet product for handling viral vectors, cell cultures and other biological materials, with its nominal specifications and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Computer

• type code Computer · version 1.0.0 · schema

A computer model used to run acquisition, stimulus-control or analysis software, with its nominal specifications and supplier. Single-board computers and microcontrollers have their own types.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Electronic component

• type code ElectronicComponent · version 1.0.0 · schema

An electronic part or module, such as a connector, relay, filter or circuit board, with its nominal specifications and supplier. Use it for electronics that no more specific hardware type describes.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Fume hood

• type code FumeHood · version 1.0.0 · schema

A fume hood product for working with volatile chemicals such as fixatives and solvents, with its nominal specifications and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Glass micropipette puller

• type code GlassMicropipettePuller · version 1.0.0 · schema

A micropipette puller product for fabricating glass pipettes for patch clamp, sharp-electrode recording or microinjection, with its nominal specifications and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Microcontroller (e.g., Arduino)

• type code Microcontroller · version 1.0.0 · schema

A microcontroller board, such as an Arduino model, used for task control, triggering or sensor readout, with its nominal specifications and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Microscope

• type code Microscope · version 1.0.0 · schema

A microscope product, such as a widefield, confocal, two-photon or dissection microscope, with its nominal specifications and supplier. Head-mounted miniature microscopes have their own type.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Monitor

• type code Monitor · version 1.0.0 · schema

A display product used for presenting visual stimuli or operating acquisition software, with its nominal specifications and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

Single-board computer (e.g., Raspberry Pi)

• type code SingleBoardComputer · version 1.0.0 · schema

A single-board computer model, such as a Raspberry Pi, with its nominal specifications and supplier.

This type has no type-specific properties: send an empty object. Everything meaningful is recorded on the record itself or on its material usage rows.

External Identifiers

• type code ExternalIdentifiers · version 1.0.0 · schema

Add external identifiers from databases like NCBI, JAX, DOI, etc. Include URLs when available.

Property	Title	Shape	Required	Allowed values	Meaning
source	Source	choice	yes	one of DOI, PubMed, Manufacturer, Model Number, Serial Number, Custom, Other; default "Manufacturer"
id	Identifier	text	yes
url	URL (optional)	text

Illustrative payload:

[
    {
        "source": "DOI",
        "id": "text",
        "url": "text"
    }
]