diff --git a/aif.xsd b/aif.xsd
index e959ea5..9800c84 100644
--- a/aif.xsd
+++ b/aif.xsd
@@ -8,7 +8,7 @@
 
     <xs:simpleType name="t_diskdev">
         <xs:restriction base="xs:string">
-            <xs:pattern value="/dev/([A-Za-z0-9_]+/)?[A-Za-z0-9_]+[0-9]?"/>
+            <xs:pattern value="(/dev/([A-Za-z0-9_]+/)?[A-Za-z0-9_]+[0-9]?|auto)"/>
             <xs:whiteSpace value="collapse"/>
         </xs:restriction>
     </xs:simpleType>
diff --git a/aif/disk/block.py b/aif/disk/block.py
index 4736de8..935f341 100644
--- a/aif/disk/block.py
+++ b/aif/disk/block.py
@@ -1,3 +1,4 @@
 from . import _common
 
-BlockDev = _common.BlockDev
+_BlockDev = _common.BlockDev
+
diff --git a/aif/disk/block_fallback.py b/aif/disk/block_fallback.py
index cf795a2..f6b40b7 100644
--- a/aif/disk/block_fallback.py
+++ b/aif/disk/block_fallback.py
@@ -220,3 +220,8 @@ class Disk(object):
             p.is_hiformatted = True
         self.is_partitioned = True
         return()
+
+class Mount(object):
+    def __init__(self, mount_xml, partobj):
+        self.xml = mount_xml
+        pass
diff --git a/aif/utils.py b/aif/utils.py
index 1ade72e..799f7ad 100644
--- a/aif/utils.py
+++ b/aif/utils.py
@@ -1,4 +1,10 @@
-import re
+import os
+
+def hasBin(binary_name):
+    paths = []
+    for p in os.environ.get('PATH', '/usr/bin:/bin').split(':'):
+        os.listdir(os.path.realpath(p))
+
 
 def xmlBool(xmlobj):
     # https://bugs.launchpad.net/lxml/+bug/1850221
diff --git a/examples/aif.xml b/examples/aif.xml
index 28162e4..274b8bc 100644
--- a/examples/aif.xml
+++ b/examples/aif.xml
@@ -185,3 +185,4 @@
         </post>
     </scripts>
 </aif>
+