Scriptable getQueryScope()
public Scriptable getQueryScope( )
	Scriptable getQueryScope()	{		if ( queryScope == null )		{			// Set up a query scope. All expressions are evaluated against the 			// Data set JS object as the prototype (so that it has access to all			// data set properties). It uses a subscope of the externally provided			// parent scope, or the global shared scope			queryScope = newSubScope( parentScope );			queryScope.setPrototype( dataSet.getJSDataSetObject() );		}		return queryScope;	}