hasRelatedFile.ttl

:object1 a pcdm:Object ; 
  dc:title "I'm a thing" ;
  ldp:contains :object2, :object3 ;   # I'm told there's some use of an indirect container, here...
  pcdm:hasMember :object2, :object3 . # ...but it seems orthogonal to this issue.

:object2 a pcdm:Object ;
  ldp:contains :fileContainer1, :relatedFileContainer1 ;
  pdcm:hasFile :blob1 ;
  pdcm:hasRelatedFile :blob2 .
  
:fileContainer1 a ldp:DirectContainer ;
  ldp:membershipResource :object2 ;
  ldp:hasMemberRelation pdcm:hasFile ;
  ldp:contains :blob1 .
  
:relatedFileContainer1 a ldp:DirectContainer ;
  ldp:membershipResource :object2 ;
  ldp:hasMemberRelation pdcm:hasRelatedFile ;
  ldp:contains :blob2 .

:object3 a pcdm:Object ;
  ldp:contains :fileContainer2, :relatedFileContainer2 ;
  pdcm:hasFile :blob3 ;
  pdcm:hasRelatedFile :blob4 .
  
:fileContainer2 a ldp:DirectContainer ;
  ldp:membershipResource :object3 ;
  ldp:hasMemberRelation pdcm:hasFile ;
  ldp:contains :blob3 .
  
:relatedFileContainer2 a ldp:DirectContainer ;
  ldp:membershipResource :object3 ;
  ldp:hasMemberRelation pdcm:hasRelatedFile ;
  ldp:contains :blob4 .
  
# + describedBy LDP-RSs for each of `blob*`

implementation-non-specific.ttl

:object1 a pdcm:Object .
  dc:title "I'm a thing" ;
  ldp:contains :fileContainer ;
  pcdm:hasFile :blob1, :blob2 .
  
:fileContainer a ldp:DirectContainer .
  ldp:membershipResource :object1 ;
  ldp:hasMemberRelation pdcm:hasFile ;
  ldp:contains :blob1, :blob2 .
  
:blob1_desc powder:describes :blob1 ;
  a ldp:DirectContainer ;
  ldp:hasMemberRelation pdcm:hasFile ;
  ldp:membershipResource :blob1 ;
  ldp:contains :blob3
:blob1 pcdm:hasFile :blob3 .

:blob2_desc powder:describes :blob2 ;
  a ldp:DirectContainer ;
  ldp:hasMemberRelation pdcm:hasFile ;
  ldp:membershipResource :blob2 ;
  ldp:contains :blob4 .
:blob2 pcdm:hasFile :blob4 .

# + describedBy LDP-RSs for :blob3 and :blob4.