A sample application program to call metacat string service.
Fixed some bugs in this file.
Implementation for the interface.
Add a new client interface with string type for web service.
in toxml method, add new code to handle dtd.
Add a new constructor to hanlde DTD node.
Add code to handle public id and system id.
Implement logout method.
Add a logout method.
Implemented the update and delete methods in the interface, along with tests.
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