CMarkup Close Method
bool bSuccess = xml.Close();
true if the file is successfully closed, or
false if the file was not open or there was an error closing it. The result string can be retrieved with GetResult.
CMarkup object is in file mode and it goes out of scope or is deleted then the
Close method is called from the destructor.
Close is called, the content of the in-memory partial document buffer is cleared and the
CMarkup object can be used in regular mode (or a file mode if
Open is called again).