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[1] [CITE@en[Activity Vocabulary]]
([TIME[2017-05-21 23:50:36 +09:00]])
<https://w3c.github.io/activitystreams/vocabulary/#dfn-units>
]FIGCAPTION]

> Specifies the measurement units for the radius and altitude properties on a Place object. If not specified, the default is assumed to be "m" for "meters".
> Range:	"cm" | " feet" | " inches" | " km" | " m" | " miles" | xsd:anyURI

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