CR — Unclear CasefileItem TargetRef and SourceRef and instance operations referring to them

pg 16 text and table 5.11 (CaseFileItem attributes) describe how to create hierarchical structures (that could correspond to CMIS folders) using children and parent, but it is not clear the reason for targetRef and sourceRef. Clarification is needed, or they should be removed.
pg 67. getFileItemInstanceTarget and getFileItemInstanceChild have the same description with the only exception that Target or child is used. The same is true for operations getCaseFileItemInstanceSource and getCaseFileItemInstanceParent.

Clarify CaseFileItem containment and references

Clarify CaseFileItem parent child relationships. With the clarification of children/parent and targetRefs/sourceRef the table 7.3 on page 67 should become clear.