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Capturing complex workflow provenance
Some processing histories may not be simple sequential pipelines and may require a more general graph structure. As mentioned in today's board call, some OCR post-correction schemes provide examples of such processing:
- merging results from multiple OCR engines
- post-correction using multiple information sources
- coalescing information from multiple page images and their OCR results
If it is desired that the results of such processing be represented in ALTO, then a more general provenance scheme capable of representing graph-structured dependencies might be required, such as that referred to by Clemens in his Aug 2 comment.