Implementation 

Required if the Trigger is Message

Attribute Information

Used By

Element xpdl:StartEvent

Source 

<xsd:attribute name="Implementation" use="optional" default="WebService">
  <xsd:annotation>
    <xsd:documentation>Required if the Trigger is Message</xsd:documentation>
  </xsd:annotation>
  <xsd:simpleType>
    <xsd:restriction base="xsd:NMTOKEN">
      <xsd:enumeration value="WebService"/>
      <xsd:enumeration value="Other"/>
      <xsd:enumeration value="Unspecified"/>
    </xsd:restriction>
  </xsd:simpleType>
</xsd:attribute>

Sample