** Changed in: zorba
    Milestone: 2.2 => 2.5

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  Item API needs operator<<

Status in Zorba - The XQuery Processor:
  In Progress

Bug description:
  To emit the string value of an Item to an ostream, you currently have
  to use getStringValue() or getStringValue2(). This is inefficient
  since a string that is otherwise not needed needs to be created.

  Instead, there should be a global operator<< defined:

      std::ostream& operator<<( std::ostream&, store::Item const& );

  Its implementation could simply call a new protected, pure virtual
  member function for Item:

      virtual void emit( std::ostream& ) const = 0;

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