<xsd:element name="Substance" minOccurs="0" maxOccurs="unbounded">
<xsd:complexType>
<xsd:sequence>
<xsd:element name="SubstanceType" type="SubstanceTypeType">
<xsd:annotation>
<xsd:documentation>Name of the substance being tested for.</xsd:documentation>
</xsd:annotation>
</xsd:element>
</xsd:sequence>
</xsd:complexType>
</xsd:element>
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