<https://www.gdscorp.com/blog/catalytic-infrared-sensors/the-pros-and-cons-of-catalyst-sensors/attachment/catalyst-sensor-work/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.gdscorp.com/blog/catalytic-infrared-sensors/the-pros-and-cons-of-catalyst-sensors/attachment/catalyst-sensor-work/>