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Modified NominalComposition to include basis, default unknown #13

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Modified NominalComposition to include basis, default `unknown`
kroenlein Nov 3, 2019
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Merge branch 'master' into nominal-composition
kroenlein Jun 22, 2020
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Merge branch 'master' into nominal-composition
kroenlein Jun 30, 2020
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8 changes: 8 additions & 0 deletions docs/specification/value-types.md
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Expand Up @@ -255,10 +255,18 @@ For example "one part flour two parts sugar" is acceptable.
A composition represented as a map from the component name to the quantity.
The quantities do not express an uncertainty, but also do not imply that there is absolute certainty in their values.

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Field name | Value type | Default | Description
----------------|------------|---------|-----------
`type` | String | Req. | "nominal\_composition"
`quantities` | Map[String, Number]| Empty set | | Map[String, Number]
`basis` | `mass`, `volume`, `number`, `unknown` | `unknown` | The type of measurement that informed the quantity
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@maxhutch maxhutch Jun 22, 2020

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What about "other"? I'm thinking about some of the exotic formulations use cases like dry basis.

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@kroenlein kroenlein Jun 22, 2020

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Dry basis is still a mass (or molar or volume) basis. Compositions are not guaranteed to be normalized, so a user filter or Attribute Template could meet that need.

More complex expressions like molarity are so complex that explicit attributes are probably the only reasonable solution.

=======
| Field name | Value type | Description |
|--------------|---------------------|------------------------|
| `type` | String | "nominal\_composition" |
| `quantities` | Map[String, Number] | Map[String, Number] |
>>>>>>> master

##### Constraints

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