Previous versions of IPXACT has attributes, 'left' and 'right' inside internalPortReference element of adHocConnection in design IPXACT as shown in the following 4 lines of xml.
<spirit:adHocConnection>
<spirit:name>....</spirit:name>
<spirit:internalPortReference spirit:ComponentRef = "..." spirit:PortRef=".." spirit:left="..." spirit:right="...."/>
</spirit:adHocConnection>
These attributes basically say that which vector range of port from one component is mapped to another (I assume)
However, the same