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How the transformation from instance mapping mappings to mapping rule rules is performed is described in the following steps:
- Group instance mappings with identical sources together
- Instance mappings have identical sources if the source expression, source label and all additional context expressions and labels are exactly the same
- For each group of instance mappings
- If there is a single source and a single instance mapping in the group, transform to Direct mapping
- If there are multiple sources and a single instance mapping in the group, transform to Join mapping
- If there is a single source and a multiple instance mappings in the group, transform to Split mapping
- If there are multiple sources and multiple instance mappings in the group, transform to Full mapping
With these definition we can summarize the transformation from instance mappings to mapping rules in the following table.
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