Element for a root unit (from an extensive enumerated list) allowing an optional prefix and power. E.g., mm^2 EnumeratedRootUnit has the following attributes:
| Attribute | Namespace | Type | Use | Default | Fixed | Description |
|---|---|---|---|---|---|---|
| unit | unitsml | Restriction of type xsd:token | req. | Unit identifier; the enumerated list is basically English unit names in lowercase, with a few upper case exceptions, e.g., 32F, mmHg, pH. | ||
| sourceURL | unitsml | xsd:anyURI | optional | Relevant URL for available information. | ||
| prefix | unitsml | Restriction of type xsd:token | opt. | Prefix identifier; e.g., m, k, M, G. [Enumeration order is by prefix magnitude (Y to y) followed by binary prefixes.] | ||
| powerNumerator | unitsml | xsd:byte | optional | 1 | An integer exponent of the unit. |