How to find all documents tagged with same metadata as parent page?

Short description of my goal:

I want to use metadata of a wiki page to find documents with the same metadata. The results should be displayed in a Search Results web part on the wiki page.

My setting is as follows:

• Team Site containing a Document Library DocLib and a Wiki Page Library WikiLib


• the Document Library contains a column DocID of type Managed Metadata


• the Wiki Library contains a column ParentIDs of type Managed Metadata (allows multiple values)


• DocID and ParentIDs point to the same parent term in the term store

Now the seemingly easy task:

• place a Search Result web part on a wiki page in WikiLib


• configure the Search Result web part to find all documents where DocID is equal to one of the ParentIDs of the wiki page

My naive approach:

owstaxIdDocID:{Page.owstaxIdParentIDs}

But this doesn't work. More tries:

owstaxIdDocID:Page.owstaxIdParentIDs

{|owstaxIdDocID:{Page.owstaxIdParentIDs}}

owstaxIdDocID:owstaxIdParentIDs

All to no avail.

(Side note: Using the managed properties each on its own works fine, e.g. using owstaxIdDocID:foo works.)

Does anybody know whether this is possible at all? And if yes: how is the correct syntax?