DocumentSplitAdapter

[rsoika]

Implement a new Adapter class that is able to split a workitem into sub workitem based on attached documents.

For example if a workitem contains 3 invoice douments in PDF format, the adapter is able to create 3 sub processes (simmilar to the SplitPlugin from the core project).

• Create a sub workitem for each attachment matching a given regex
• transfer the document and metadata (including optional OCR information) into the split workitem.
• do not change the master workitem

Need to be patched for 2x version!