For the recored,the error correction

interface/ri_data.py

@@ -629,7 +629,8 @@ p_node - xml node (parent node)'''
             srvs.appendChild(srv)
         p_node.appendChild(srvs)
 
-def install_information():
+def prepar_installation():
+    '''create file called 'intall.xml',which contains the information about the  installation'''
     to_xml()
     xmldoc = minidom.parse(install_xml)
     root = xmldoc.firstChild