Bug 213126 Add support for DataEngine-leve dataset cache
In many cases the DataEngine-leve dataset cache is useful which ensure that a dataset is executed one time during rendering one report. To support this feature a new dataset property should be added. The Birt customer can choose whether this dataset need to be cached or not by setting the property in deisgn time.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/writer/ModuleWriter.java
public void visitTabularMeasure( TabularMeasure obj )
	{
		writer.startElement( DesignSchemaConstants.TABULAR_MEASURE_TAG );
		super.visitTabularMeasure( obj );
		writer.endElement( );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.elements.ElementVisitor#visitTabularMeasureGroup(org.eclipse.birt.report.model.elements.olap.TabularMeasureGroup)
	 */
	public void visitTabularMeasureGroup( TabularMeasureGroup obj )
	{
		writer.startElement( DesignSchemaConstants.TABULAR_MEASURE_GROUP_TAG );
		super.visitTabularMeasureGroup( obj );
		writer.endElement( );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.elements.ElementVisitor#visitOdaCube(org.eclipse.birt.report.model.elements.olap.OdaCube)
	 */
	public void visitOdaCube( OdaCube obj )
	{
		writer.startElement( DesignSchemaConstants.ODA_CUBE_TAG );
		super.visitOdaCube( obj );
		property( obj, IOdaOlapElementModel.NATIVE_NAME_PROP );
		writer.endElement( );
	}
	/*