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 visitFilterConditionElement( FilterConditionElement obj )
	{
		writer.startElement( DesignSchemaConstants.FILTER_CONDITION_TAG );
		markLineNumber( obj );
		super.visitFilterConditionElement( obj );
		property( obj, IFilterConditionElementModel.IS_OPTIONAL_PROP );
		property( obj, IFilterConditionElementModel.EXPR_PROP );
		property( obj, IFilterConditionElementModel.OPERATOR_PROP );
		writeSimplePropertyList( obj, IFilterConditionElementModel.VALUE1_PROP );
		property( obj, IFilterConditionElementModel.VALUE2_PROP );
		property( obj, IFilterConditionElementModel.FILTER_TARGET_PROP );
		writeContents( obj, IFilterConditionElementModel.MEMBER_PROP );
		writer.endElement( );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.elements.ElementVisitor#visitMemberValue(org.eclipse.birt.report.model.elements.MemberValue)
	 */
	public void visitMemberValue( MemberValue obj )
	{
		writer.startElement( DesignSchemaConstants.MEMBER_VALUE_TAG );
		markLineNumber( obj );
		super.visitMemberValue( obj );
		property( obj, IMemberValueModel.VALUE_PROP );
		property( obj, IMemberValueModel.LEVEL_PROP );
		writeContents( obj, IMemberValueModel.MEMBER_VALUES_PROP );
		writer.endElement( );
	}