<!ATTLIST storage_type id CDATA #REQUIRED>
<!ATTLIST storage_type model CDATA #REQUIRED>
<!ATTLIST storage_type size CDATA #REQUIRED>
-<!ATTLIST storage_type content CDATA "0">
+<!ATTLIST storage_type content CDATA "">
<!ELEMENT storage (prop*)>
<!ATTLIST storage id CDATA #REQUIRED>
<!ATTLIST storage typeId CDATA #REQUIRED>
+<!ATTLIST storage content CDATA "">
<!ELEMENT mount EMPTY>
<!ATTLIST mount id CDATA #REQUIRED>