To enable publishers to express connections between activities, the addition of an activity-id attribute to the participating-org element may be useful.
Currently, publishers can say:
[participating-org role="Funding" ref="GB-1"]
... to state that DfID (GB-1) are a Funding partner in the activity
The addition of an activity-id attribute would enable linkage to specific IATI activities within this element:
[participating-org role="Funding" ref="GB-1" activity-id"GB-1-12345"]
.....to state that DfID (GB-1) are a Funding partner in this activity, via activity GB-1-12345
This could help both publishers and users to establish and explore linkages between activities. It would be expected that transactions would then describe the specific flows of money - but this link could be made from the outset/initially - and may also be a useful focal point for data users.
It could be argued that related-activity could be used for this - although this lacks the @role and @ref attributes for the organisation. Additionally, the current codes for RelatedActivity don't seem to express this (particularly 5): http://iatistandard.org/201/codelists/RelatedActivityType/