[Tagging] RFD pipeline sub tag substance

[Martin Koppenhoefer]

2015-01-29 5:41 GMT+01:00 johnw <johnw at mac.com>:

> if this is the proper term used for pipelines, then this would be the
> right one,
>
> Otherwise, =multi (like sports) would be the best.
>
> but you would not need such a tag, since it would be
>
> substance=gas
> substance:detailed=multiphase_gas
>
> if you keep it at two levels of detail (water, gas, oil,  fuel, sewage,
> heat, coolant, etc),
>


I'd like to repeat once again that "substance" doesn't seem to be a nice
key descriptor for values like "gas", "fuel", "heat", as it refers to
physical matter/material and "heat" or "gas" or "fuel" in its actual
meaning aren't materials.

cheers,
Martin
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