Add the code to handle subtree control for reading(but finished yet).
Does not setting namepaces-prefix feature true for sax parser. If set it true, namespace will be treat as both namespace and attribute.
Adding more constant strings.
Chane a info for output.
Change some hard code to constant string.
Change the code to handle permission checking.
Move the permission checking part.
Add a file to handle permission checking.
Get rid of the permission code to handle ticket count and duration.
Add code to delete the previous permission when update.
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