<simpleType name="LowStrainTestMethodEnumType">
<restriction base="string">
<enumeration value="pulse_echo">
<annotation>
<documentation>Pulse Echo Method: the velocity of the pile head, and optionally the force, is evaluated as a function of time. The sonic echo method; the reflection method of NF P94-160-2.</documentation>
</annotation>
</enumeration>
<enumeration value="transient_response">
<annotation>
<documentation>Transient Response Method: the ratio of the velocity transform to the force transform is evaluated as a function of frequency. Requires the force to be measured. The impedance method of NF P94-160-4.</documentation>
</annotation>
</enumeration>
</restriction>
</simpleType>
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