private void AddCompoundAttributeToXml(BaseUsage usage, int number, string xpath)
{
TaskManager = (CreateTaskmanager)Session["CreateDatasetTaskmanager"];
XDocument metadataXml = (XDocument)TaskManager.Bus[CreateTaskmanager.METADATA_XML];
XmlMetadataWriter xmlMetadataWriter = new XmlMetadataWriter(XmlNodeMode.xPath);
metadataXml = xmlMetadataWriter.AddPackage(metadataXml, usage, number, UsageHelper.GetNameOfType(usage), UsageHelper.GetIdOfType(usage), UsageHelper.GetChildren(usage), BExIS.Xml.Helpers.XmlNodeType.MetadataAttribute, BExIS.Xml.Helpers.XmlNodeType.MetadataAttributeUsage, xpath);
TaskManager.Bus[CreateTaskmanager.METADATA_XML] = metadataXml;
}