| Figure 127: DTD-diagram for SI-UNIT
Child elements | none
parent elements | <sw-unit>
Attributes for SI-UNIT
Name | Type | Class | Value | Remark
--- | --- | --- | --- | ---
[AMOUNT-OF-SUBSTANCE-EXPO] | cdata | implied |  |
[ELECTRIC-CURRENT-EXPO] | cdata | implied |  |
[LENGTH-EXPO] | cdata | implied |  |
[LUMINOUS-INTENSITY-EXPO] | cdata | implied |  |
[MASS-EXPO] | cdata | implied |  |
[S] | cdata | implied |  |
[THERMODYNAMIC-TEMPERATURE-EXPO] | cdata | implied |  |
[TIME-EXPO] | cdata | implied |  |
Description There are SI units of measure for the units of measure. STEP (ISO/DIS 10303-41. S96ff) is supported with regard to SI units by seven basic units (length, mass, time, electric_current, thermodynamic_temperature, amount_of_substance, luminous_intensity). These basic units are realized by means of attributes. Example
    <sw-unit>
          <long-name>Meter per second</long-name>
          <short-name>mps</short-name>
          <si-unit length-expo = "1" time-expo = "-1"></si-unit>
              <sw-unit-display></sw-unit-display>
       </sw-unit>