<simpleType name="ActionNatureEnumType">
<restriction base="string">
<enumeration value="permanent">
<annotation>
<documentation>An action expected to act throughout a given reference period, whose variation in magnitude is negligible (EC7/BS EN 1990).</documentation>
</annotation>
</enumeration>
<enumeration value="variable">
<annotation>
<documentation>An action whose magnitude varies significantly over the reference period (EC7/BS EN 1990).</documentation>
</annotation>
</enumeration>
<enumeration value="accidental">
<annotation>
<documentation>An action of short duration but significant magnitude, unlikely to occur on a given structure over its design life (EC7/BS EN 1990).</documentation>
</annotation>
</enumeration>
<enumeration value="seismic">
<annotation>
<documentation>An action arising from earthquake ground motion, classified separately from generic accidental actions in EC7/BS EN 1990.</documentation>
</annotation>
</enumeration>
</restriction>
</simpleType>
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