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## net.sf.saxon.expr.flwor
Class SingularityPull

    java.lang.Object
      net.sf.saxon.expr.flwor.TuplePull
          net.sf.saxon.expr.flwor.SingularityPull

    public class SingularityPull

extends TuplePull

The "singularity" tuple stream delivers a single empty tuple. It is the base tuple stream for the outermost for/let clause in a FLWOR expression

Constructor Summary
`SingularityPull()`

Method Summary
`boolean` | `nextTuple(XPathContext context)` Move on to the next tuple.

Methods inherited from class net.sf.saxon.expr.flwor.TuplePull
`close`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### SingularityPull

    public SingularityPull()

Method Detail

### nextTuple

    public boolean nextTuple(XPathContext context)

  Move on to the next tuple. Before returning, this method must set all the variables corresponding to the "returned" tuple in the local stack frame associated with the context object

  Specified by:
    `nextTuple` in class `TuplePull`
  Parameters:
    `context` - the dynamic evaluation context
  Returns:
    true if another tuple has been generated; false if the tuple stream is exhausted. If the method returns false, the values of the local variables corresponding to this tuple stream are undefined.

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Copyright (c) 2004-2011 Saxonica Limited. All rights reserved.