public interface ContextMappingFunction
This is a specialization of the more general MappingFunction class: it differs in that each item being processed becomes the context item while it is being processed.
SequenceIterator map(XPathContext context) throws XPathException
context- The processing context. The item to be mapped is the context item identified from this context: the values of position() and last() also relate to the set of items being mapped
XPathException- if a dynamic error is detected
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