#include <DbXml.hpp>

class DbXml::XmlQueryExpression {
public:
	XmlQueryExpression ()
	virtual ~XmlQueryExpression ()
	XmlQueryExpression (const XmlQueryExpression &)
	XmlQueryExpression & operator= (const XmlQueryExpression &)
	...
};

An XmlQueryExpression represents a parsed XQuery expression, and is created by a call to XmlManager::prepare. Parsed XQuery expressions are useful because they allow the cost of query parsing and optimization to be amortized over many evaluations. If indices of a container that may be referenced by a parsed XQuery expression are modified (e.g. add/drop an index) the XmlQueryExpression object should be regenerated by the application.

The copy constructor and assignment operator are provided for this class. The class is implemented using a handle-body idiom. When a handle is copied both handles maintain a reference to the same body. This object is free threaded, and can be safely shared among threads in an application.