public void loadXMLFile(string path)
{
XmlDocument XMLFile = new XmlDocument();
XMLFile.Load(path);
XmlNamespaceManager manager = new XmlNamespaceManager(XMLFile.NameTable);
manager.AddNamespace("hl7", "urn:hl7-org:v3");
sequences = XMLFile.SelectNodes("//hl7:series/hl7:component/hl7:sequenceSet/hl7:component/hl7:sequence", manager);
}