use lxml xpath() to allow complex predicates in row selection

django_diu/import_command.py

@@ -170,7 +170,7 @@ class XMLImportTask(ImportTask):
 
     def open_data_source(self):
         self.root = etree.parse(self.xmlFile)
-        self.rows = self.root.findall(self.xpathSelector)
+        self.rows = self.root.xpath(self.xpathSelector)
 
     def count_source(self):
         self.source_count = len(self.rows)