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Implementation of Node functions
It takes the first value from all the contexts and put them into a context on
the target side, So that all values come under one context.
Empty contexts are replaced by empty strings.
depicts the collapseContexts functionality.
depicts the collapseContexts mapping result.
As shown in the figure below the maximum occurrence of the header node in
the source is 1 and the target is unbounded. So we have only one occurrence of
MatNo & MatDesc, which has to be replicated for every line Item.
Above figure depicts, both source & target structures.
Above fig depicts, mapping of usOneAsMany function
above figure, useOneAsMany takes
field will also be mapped in similar way like MatNo.
time Item node appears (repeats), same number of time Header node will appear in
target side. So, source Item node is mapped to Target Header node.
fig, Item node is duplicated.
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