DtdProcessing
Specifies the options for processing DTDs. The DtdProcessing enumeration is used by the XmlReaderSettings class.
Ignore = 1
Causes the DOCTYPE element to be ignored. No DTD processing occurs.
Parse = 2
Prohibit = 0
Specifies that when a DTD is encountered, an XmlException is thrown with a message that states that DTDs are prohibited. This is the default behavior.