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## net.sf.saxon.expr.sort
Interface SortKeyEvaluator

All Known Implementing Classes:
  ForEachGroup, SortExpression, XPathExpressionImpl

    public interface SortKeyEvaluator

Callback interface used to evaluate sort keys. An instance of this class is passed to the SortedIterator, and is used whenever a sort key value needs to be computed.

Method Summary
`AtomicValue` | `evaluateSortKey(int n, XPathContext context)` Evaluate the n'th sort key of the context item

Method Detail

### evaluateSortKey

    AtomicValue evaluateSortKey(int n,
                                XPathContext context)
                                throws XPathException

  Evaluate the n'th sort key of the context item

  Throws:
    `XPathException`

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