code: public static TreeMap<Integer, SpaceGroup> parseSpaceGroupsXML(
  			InputStream spaceGroupIS) throws IOException, JAXBException {
  
  		String xml = convertStreamToString(spaceGroupIS);
  
  		SpaceGroupMapRoot spaceGroups = SpaceGroupMapRoot.fromXML(xml);
  		return spaceGroups.getMapProperty();
  
  	}
docs: Load all SpaceGroup information from the file spacegroups.xml
  
  @return a map providing information for all spacegroups