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
}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.elements.ElementVisitor#visitModule(org.eclipse.birt.report.model.core.Module)
	 */
	public void visitModule( Module obj )
	{
		if ( markLineNumber )
			obj.initLineNoMap( );
		markLineNumber( obj );
		writer.attribute( DesignSchemaConstants.XMLNS_ATTRIB,
				DEFAULT_NAME_SPACE );
		writer.attribute( DesignSchemaConstants.VERSION_ATTRIB,
				DesignSchemaConstants.REPORT_VERSION );
		writer.attribute( DesignSchemaConstants.ID_ATTRIB, new Long( obj
				.getID( ) ).toString( ) );
		property( obj, IModuleModel.AUTHOR_PROP );
		property( obj, IModuleModel.HELP_GUIDE_PROP );
		property( obj, IModuleModel.CREATED_BY_PROP );
		property( obj, IModuleModel.UNITS_PROP );
		property( obj, IModuleModel.BASE_PROP );
		property( obj, IModuleModel.INCLUDE_RESOURCE_PROP );
		resourceKey( obj, IModuleModel.TITLE_ID_PROP, IModuleModel.TITLE_PROP );
		property( obj, IDesignElementModel.COMMENTS_PROP );
		resourceKey( obj, IModuleModel.DESCRIPTION_ID_PROP,
				IModuleModel.DESCRIPTION_PROP );
		writeUserPropertyDefns( obj );
		writeUserPropertyValues( obj );