PackageRef 

BPMN: Corresponds to BPMN attribute DiagramRef, pointer to a BPD identified by Package/@Id.  [Maybe IDREF doesn't work here since ID is in a different document.]

Attribute Information

Used By

Element xpdl:SubFlow

Source 

<xsd:attribute name="PackageRef" type="xpdl:IdRef" use="optional">
  <xsd:annotation>
    <xsd:documentation>BPMN: Corresponds to BPMN attribute DiagramRef, pointer to a BPD identified by Package/@Id. [Maybe IDREF doesn't work here since ID is in a different document.]</xsd:documentation>
  </xsd:annotation>
</xsd:attribute>

Sample