<simpleType name="sourceTypeEnumType">
<annotation>
<documentation>1) impulsive - an energy source of short duration that is repeatable and does not generate noise that interferes with detection. 2) nonimpulsive - an energy source transmitted into the ground for an extended period of time.</documentation>
</annotation>
<restriction base="string">
<enumeration value="impulsive"/>
<enumeration value="nonimpulsive"/>
</restriction>
</simpleType>
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