<xsd:complexType name="CommodityExercisePeriods">
<xsd:sequence>
<xsd:element name="commencementDate" type="AdjustableOrRelativeDate" minOccurs="0">
<xsd:annotation>
<xsd:documentation xml:lang="en">The first day of the exercise period for an American style option.</xsd:documentation>
</xsd:annotation>
</xsd:element>
<xsd:element name="expirationDate" type="AdjustableOrRelativeDate" minOccurs="0">
<xsd:annotation>
<xsd:documentation xml:lang="en">The last day within an exercise period for an American style option. For a European style option it is the only day within the exercise period.</xsd:documentation>
</xsd:annotation>
</xsd:element>
</xsd:sequence>
</xsd:complexType>
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