What part of the trigger signal will cause this segment to execute. Use "NoWait" if you want this segment to automatically execute.

<xs:attribute name="trigger" use="optional">
    <xs:annotation>
        <xs:documentation>What part of the trigger signal will cause this segment to execute. Use "NoWait" if you want this segment to automatically execute.</xs:documentation>
    </xs:annotation>
    <xs:simpleType>
        <xs:restriction base="xs:string">
            <xs:enumeration value="NoWait" />
            <xs:enumeration value="RisingEdge" />
            <xs:enumeration value="FallingEdge" />
            <xs:enumeration value="High" />
            <xs:enumeration value="Low" />
            <xs:enumeration value="EitherEdge" />
        </xs:restriction>
    </xs:simpleType>
</xs:attribute>